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Chinese Journal of Catalysis
2006, Vol. 27, No. 12
Online: 25 December 2006

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Gas-Phase Photocatalytic Oxidation of Benzene over Titanium Dioxide Modified by Silane Coupling Agent ZHONG Junbo, PI Zhan, LIN Tao, GONG Maochu, WANG Jianli, LIU Zhimin, CHEN Yaoqiang* 2006, 27 (12):  1045-1047.  Abstract ( 2006 )   [Full Text(HTML)] () PDF (228KB) ( 691 )   The photocatalytic activity of TiO2 for the decomposition of gaseous benzene in a batch reactor can be greatly improved by modifying TiO2 with 3-(trimethoxysilyl)propylmethacrylate.The photocatalyst prepared was characterized by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy (XPS). The XPS spectrum shows that the binding energy of Ti 2p for the modified TiO2 shifted to a low value. The modified TiO2 has a photocatalytic activity 2.5 times that of pure TiO2.

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Thermo-Photocatalytic Degradation of Gas-Phase Benzene over Pt-TiO2/CeO2-MnO2 Composite Catalyst REN Chengjun1*, ZOU Tao1, CHEN Guoqiang2, CHEN Yaoqiang1, GONG Maochu1 2006, 27 (12):  1048-1050.  Abstract ( 2129 )   [Full Text(HTML)] () PDF (254KB) ( 782 )   The Ce-Mn oxygen storage material was prepared by the sol-gel method, and the Pt-TiO2/CeO2-MnO2 composite catalyst was synthesized by loading TiO2 and Pt on the oxygen storage material. The composite catalyst was characterized using X-ray diffraction, scanning electron microscopy, temperature-programmed reduction, and diffuse reflectance ultraviolet-visible spectroscopy. Its catalytic activity for the thermo-photocatalytic degradation of gas-phase benzene was evaluated. The results revealed that Mn entered the TiO2 and CeO2 lattice and formed solid solution, resulting in uniformity of the catalyst. Pt was dispersed uniformly on the catalyst surface. The Ce-Mn oxygen storage material had good oxygen storage capability at 250 ℃. The composite catalyst showed stronger absorption in the UV and visible region than TiO2. The activity of 1.6%Pt-40%TiO2/CeO2-MnO2 was high, and the benzene conversion reached 94.5% during the 10 h of thermo-photocatalytic process.

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NiCl2•6H2O-Catalyzed Homocoupling of Arylboronic Acids LIU Guyu, DU Qiaoling, XIE Junjie, ZHANG Kaili, TAO Xiaochun* 2006, 27 (12):  1051-1052.  Abstract ( 2194 )   [Full Text(HTML)] () PDF (144KB) ( 1112 )   By screening different organic solvents, it was found that NiCl2•6H2O can catalyze the homocoupling of arylboronic acids using K2CO3 as the base in pyridine to produce symmetrical biaryls in good yield. This reaction can be carried out with exposure to air.

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Cocatalytic Effect of New Surface-Active Phosphine in Long-Chain Olefin Hydroformylation FU Haiyan1, GUO Yu1, LIN Qi1,2, CHEN Hua1, LI Xianjun1* 2006, 27 (12):  1053-1058.  Abstract ( 2123 )   [Full Text(HTML)] () PDF (292KB) ( 857 )   The co-catalysis properties of new surface-active phosphines DPPTS (sodium salt of sulfonated C12H25PhPPh2) and OPPTS (sodium salt of sulfonated C8H17PhPPh2) for long-chain olefin hydroformylation in an aqueous/organic biphasic system have been investigated. The catalytic systems containing the surface-active phosphine show a clear matching relation between the length of olefin chain and hydrophobic chain of the surface-active phosphine. The catalytic system containing DPPTS exhibit stronger acceleration effect on olefin hydroformylation than the system containing surfactant CTAB (cetyltrimethyl ammonium bromide) and TPPTS (P(m-C6H4SO3Na)3) when the molar ratio of phosphine/rhodium is low. Moreover, the leaching of rhodium into the organic phase is only 0.8% of the total rhodium added. DPPTS with the hydrophilic group and P atom at the same end of the carbon chain shows better co-catalysis effect than reported phopsine with the hydrophilic group and P atom at the two ends of the carbon chain.

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FT-IR Study on CO Hydrogenation to C2-Oxygenates over Rh-Based Catalyst CHEN Weimiao, DING Yunjie, JIANG Dahao, JIAO Guiping, ZHU Hejun, PAN Zhendong, LUO Hongyuan 2006, 27 (12):  1059-1062.  Abstract ( 1795 )   [Full Text(HTML)] () PDF (362KB) ( 657 )   In-situ FT-IR technique was employed to investigate the evolution of surface species adsorbed on the Rh-Mn-Li-Ti/SiO2 catalyst under the reaction conditions including pressure, temperature, and H2/CO ratio during CO hydrogenation to C2-oxygenates. The results showed that high pressure favored the adsorption and the activation of CO, while high temperature favored the dissociation of adsorbed CO. The employment of high pressure and nigh temperature conditions not only promoted CO adsorption on the catalyst surface but also remained proper activity of CO dissociation. Thus CO insertion activity was enhanced, resulting in good performance for C2-oxygenate formation. The increase in H2/CO ratio promoted the adsorption of CO, and hence CO insertion, especially CO dissociation and hydrogenation, were enhanced. However, the high activities for CO dissociation and hydrogenation resulted from too high H2/CO ratio might suppress CO insertion, and thus the activity for the formation of C2-oxygenates decreased. Compared with the Rh/SiO2 catalyst, the addition of promoters (Mn, Li, and Ti) favored the formation of C2-oxygenates.

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Effect of Ti-Si Mixed Oxide Support on Gold Catalysts for Gas-Phase Epoxidation of Propylene DAI Maohua, TANG Dingliang, YUAN Youzhu* 2006, 27 (12):  1063-1068.  Abstract ( 1789 )   [Full Text(HTML)] () PDF (426KB) ( 696 )   Titania-silica mixed oxides prepared by hydrolytic and one-step non-hydrolytic sol-gel routes using TiCl4 and SiCl4 as precursors were employed as the gold catalyst supports for gas-phase epoxidation of propylene in O2 and H2. Characterization studies of the supports and catalysts were performed by means of X-ray diffraction, ultraviolet-visible absorption spectroscopy, N2 adsorption, and high-resolution transmission electron microscopy. The results indicated that the amorphous Ti-Si mixed oxides containing 6%[KG-45x]-[KG-20x]14% of Ti could be prepared by both sol-gel routes, but those by non-hydrolytic sol-gel afforded higher surface area and significant mesopores. A superior catalytic performance was obtained with the gold catalyst supported on the non-hydrolytic sol-gel Ti-Si mixed oxide containing 10% of Ti. The propylene conversion was 5.7% at the initial 60 min and 3.3% at 240 min of time on stream. The selectivity for propylene oxide was as high as 95%. The influences of aging time for the non-hydrolytic sol-gel and pH value for the Au deposition-precipitation on the performance of the Au catalyst were also discussed.

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Reaction Mechanism of Selective Oxidation of Propane to Acrolein over MoPO/SiO2 Catalyst LI Rongchun, YI Xiaodong*, ZHANG Xiaobing, HUANG Chuanjing, WENG Weizheng, WAN Huilin* 2006, 27 (12):  1069-1072.  Abstract ( 2060 )   [Full Text(HTML)] () PDF (213KB) ( 1017 )   To elucidate possible reaction pathways for propane selective oxidation to acrolein over the MoPO/SiO2 catalyst, oxidative conversions of propane and possible intermediates or their probe molecules as well as the reaction products of the selective oxidation of propane to acrolein on the catalyst were studied. The results suggested that isopropoxy species is one of the intermediates for the selective oxidation of propane to acrolein over the MoPO/SiO2 catalyst. The isopropoxy species can be converted either to acetone by dehydrogenation or to propene by β-hydrogen elimination, and the latter can be further converted to acrolein through an allylic process.

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Preparation and Characterization of TiO2-CeO2 Catalyst for Catalytic Wet Air Oxidation of Phenol CHEN Zhengxiong, ZHU Wanpeng*, YANG Shaoxia, WANG Jianbing 2006, 27 (12):  1073-1079.  Abstract ( 1595 )   [Full Text(HTML)] () PDF (720KB) ( 854 )   TiO2-CeO2 catalysts for catalytic wet air oxidation of phenol were prepared by coprecipitation. Effects of proportion of active components, calcination temperature, calcination time, and pH value during the aging process on the catalyst activity were investigated. The results indicated that keeping a constant pH of 11 during the aging was crucial for the catalytic activity of TiO2-CeO2. The microstructure of the catalysts was characterized by thermogravimetry-differential thermal analysis, N2 adsorption-desorption, X-ray diffraction, and X-ray photoelectron spectroscopy. The physical and chemical properties, such as BET specific surface area, chemisorbed oxygen, and relative content of Ce(Ⅲ) or Ti(Ⅲ) on the surface of TiO2-CeO2, had significant influence on the catalytic activity of the TiO2-CeO2 catalysts.

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Catalytic Performance of Sulfated Silica MCM-41 for Cyclization of Pseudoionone to Ionones XU Haihong1, GUO Daishi1, JIANG Qizhong1*, MA Zifeng1, LI Wanjun1, WANG Zheng2 2006, 27 (12):  1080-1086.  Abstract ( 1910 )   [Full Text(HTML)] () PDF (432KB) ( 928 )   A series of sulfated silica MCM-41 samples denoted as SM and ASM were prepared at different calcination temperatures with H2SO4 and (NH4)2SO4 solution as the promoter, respectively. The mesostructure, sulfation process, and surface acidity of the two samples were investigated by N2 adsorption-desorption, temperature-programmed desorption of adsorbed NH3 (NH3-TPD), thermogravimetric analysis (TG-DTG), elemental analysis, and Fourier transform infrared (FT-IR) spectroscopy. The activity of the samples for the traditional liquid acid-catalyzed cyclization reaction of pseudoionone to ionones was investigated. For the SM and ASM samples calcined at 450 ℃ (denoted as SM-450 and ASM-450, respectively), SO2-4 was successfully chelated onto the silica surface in bidentate complex forms, and no mobile H2SO4 molecules existed as the original promoter or intermediate of thermal decomposition inside the mesopores. The in situ pyridine adsorption FT-IR and NH3-TPD measurements revealed that ASM-450 contained both Brnsted and Lewis acid sites with weak strength. The catalytic performance of SM-450 and ASM-450 was comparable with that of the commercial acid resin Amberlyst-15, and the chelating structure of SO2-4/SiO2, which was generally considered not acid active, was responsible for the high activity. ASM-450 showed better catalytic performance than Amberlyst-15 at relatively lower temperature, and it could be reused 5 times with good activity.

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Synthesis of SnO2 Nano-Material and Its Catalytic Performance for the Reduction of Acrolein JIAO Kun1, XU Ning1, LUO Ge1, XIE Songhai2, YUAN Haiying1, ZHANG Chunlei1* 2006, 27 (12):  1087-1090.  Abstract ( 1866 )   [Full Text(HTML)] () PDF (386KB) ( 819 )   A SnO2 nano-material was synthesized by the citric method and was characterized by thermogravimetry-differential thermal analysis, X-ray diffraction, transmission electron microscope, and N2 adsorption techniques. The SnO2 obtained is nano-crystalline with uniform particle size (8-10 nm) and porous structure (pore diameter 4-6 nm). The SnO2 nano-material displayed good catalytic performance for the reduction of acrolein to allyl alcohol. The catalyst had high initial activity, and the initial conversion of acrolein reached 93.6%. The highest selectivity and yield of allyl alcohol were 60% and 47%, respectively. Coke deposition on the catalyst surface mainly contributed to its deactivation.

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One-Pot Synthesis of Visible-Light Responsive TiO2 in the Presence of Different Amines WANG Zuyuan, ZHANG Fuxiang, YANG Yali, CUI Jie, SUN Qing, GUAN Naijia* 2006, 27 (12):  1091-1095.  Abstract ( 1767 )   [Full Text(HTML)] () PDF (340KB) ( 890 )   Visible-light responsive TiO2 catalysts were prepared by a one-pot method at low temperature in different amine systems using TiCl3 as the precursor. The as-synthesized powders were characterized by X-ray diffraction, ultraviolet-visible absorption spectroscopy, elemental analysis, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The results showed that the absorption regions of the as-synthesized powders red shifted to the visible region, and the ethylenediamine system was obviously prior to the triethylamine and diethylamine systems. The nitrogen atom was located at the oxygen site of TiO2 lattice to form O[KG-45x]-[KG-20x]Ti[KG-45x]-[KG-20x]N structure in the ethylenediamine synthetic system. Phenol degradation was used as a probe reaction to evaluate the photocatalytic activity of nitrogen-doped TiO2 and 97.88% phenol was degraded after 6 h under visible light irradiation.

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Studies on Promotion Mechanism of CeO2 in Co-CeO2/SiO2 Catalyst for Fischer-Tropsch Synthesis Using D2 Pulse Reaction SHI Haibo, SHEN Shikong* 2006, 27 (12):  1096-1100.  Abstract ( 1694 )   [Full Text(HTML)] () PDF (333KB) ( 852 )   The role of the CeO2 promoter in the Co-CeO2/SiO2 catalyst playing in Fischer-Tropsch synthesis (FTS) was investigated by means of the D2 pulse reaction. The D2 pulse reaction results over Co-CeO2/SiO2 and Co/SiO2 catalysts showed that the addition of CeO2 increased the catalytic activity of Co/SiO2 for the H-D isotopic exchange and the reactivity of H from Si-OH for CO hydrogenation. The addition of CeO2 increased the total amount of active carbon species on the surface of Co/SiO2 and made the chain growth unit -[KG-20x]CH2[KG-45x]- the dominating one, which consequently benefited the increase of the FTS reactivity and the chain growth possibility. The addition of CeO2 into Co/SiO2 also improved the hydrogenation reactivity of carbon atoms on the surface of Co-CeO2/SiO2, which led to a decrease in carbon deposition.

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Preparation of Nitrogen-Doped TiO2/SiO2 Microspheres with Core-Shell Structure and Their Photocatalytic Activity under Visible Light HUANG Langhuan, CHEN Caixuan, LIU Yingliang* 2006, 27 (12):  1101-1106.  Abstract ( 2092 )   [Full Text(HTML)] () PDF (433KB) ( 773 )   TiO2/SiO2 microspheres with core-shell structure were synthesized by chemical adsorption and in situ hydrolysis using well-dispersed SiO2 microspheres as the template and tetrabutyl titanate as the precursor. The samples were calcined in a tube furnace under ammonia atmosphere at various temperatures to dope with nitrogen. The structure and morphology of the obtained samples were characterized by transmission electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, ultraviolet-visible diffuse reflectance spectroscopy, infrared spectroscopy, and X-ray photoelectron spectroscopy. The photocatalytic activity was evaluated by the degradation of rhodamine B solution under visible light irradiation. TiO2/SiO2 was of core-shell structure, and the TiO2 shell was about 10 nm in thickness. The phase transition of TiO2 at high temperature was inhibited by the formation of the Ti-O-Si bond. TiO2/SiO2 was modified by N doping in the form of the Ti-O-N bond. The effects of calcination temperature on the photocatalytic activity were investigated. The highest activity was obtained with TiO2/SiO2 calcined at 600 ℃ for 1 h under ammonia atmosphere. The SiO2 core resulted in better adsorption property, and the N-doped TiO2 shell resulted in visible light sensitization. N-doped TiO2/SiO2 benefited from both of the effects.

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Asymmetric Hydrogenation of Acetonaphthone Catalyzed by RuCl2［P(C6H5)3］2-(R,R)-DPEN TAO Ming1*, XIONG Wei1, CHEN Hua2, LI Xianjun2 2006, 27 (12):  1107-1110.  Abstract ( 2252 )   [Full Text(HTML)] () PDF (242KB) ( 873 )   A novel ruthenium complex RuCl2［P(C6H5)3］2-(R,R)-DPEN (DPEN=1,2-diphenylethylene-diamine) was synthesized and characterized by 1H and 31P NMR. The ruthenium complex was applied to the asymmetric hydrogenation of acetonaphthone.The effects of reaction temperature, hydrogen pressure, and molar ratio of base to catalyst on the activity and enantioselectivity were investigated in an isopropanol solution of (CH3)3COK. The results showed that the increase in the temperature and pressure accelerated the reaction but slightly decreased the enantioselectivity for (S)-α-naphthylethanol. Under the conditions of acetonaphthone∶(CH3)3COK∶Ru=50000∶450∶1 (molar ratio), 4 MPa, 25 ℃, and 16 h, 83% ee and 100% yield of α-naphthylethanol were achieved.

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Preparation and Characterization of Nano-Structured Au/TiO2 Catalyst with High Thermal Stability LU Qian, MENG Ming*, ZHA Yuqing 2006, 27 (12):  1111-1116.  Abstract ( 2593 )   [Full Text(HTML)] () PDF (444KB) ( 902 )   Mesoporous TiO2 was synthesized using triblock copolymer EO20PO70EO20 (P123) as the organic template, and the Au/TiO2 catalyst was prepared by the deposition-precipitation method. For comparison, industrial TiO2 and a TiO2 sample synthesized by the sol-gel method were also used as supports to prepare the Au/TiO2 catalysts. N2 adsorption-desorption, X-ray diffraction, X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy were employed to characterize the structure and the morphology of the catalysts. The results show that the TiO2 support synthesized using P123 as the organic template possesses uniform mesoporous structure with a narrow pore size distribution centered at ～6.1 nm. After supporting Au, the mesoporous structure of TiO2 is well maintained only with the pore size decreasing to ～5.4 nm. The gold in the mesoporous TiO2-supported catalyst calcined at 400 ℃ exists as Au0. The dispersion and the crystal size of Au on the three kinds of TiO2 show much difference. On the TiO2 prepared using P123, the crystal size of Au is 1-5 nm after calcination at 400 ℃, while on the other two supports, the Au crystal size reaches ～10 nm. In the ambient CO oxidation reaction, the former Au/TiO2 catalyst exhibits very high activity and thermal stability even after calcination at 420 ℃, and the CO conversion over this catalyst is more than 90%. The other two Au catalysts supported on the industrial TiO2 and the TiO2 synthesized by the sol-gel method are almost completely deactivated after calcination at 320 and 370 ℃, respectively.

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V-Doped Titanium Mixed Oxide Catalysts for OxidativeDehydrogenation of Ethylbenzene with CO2 LI Wenying*, LI Xiaohong, SONG Ruiwei 2006, 27 (12):  1117-1121.  Abstract ( 1771 )   [Full Text(HTML)] () PDF (342KB) ( 951 )   V-doped titanium mixed oxide catalysts with TiO2 as the main component were prepared by the acid catalysis sol-gel method and was applied for ethylbenzene oxidative dehydrogenation in the presence of carbon dioxide at 450 ℃. The catalysts were characterized by X-ray diffraction, N2 physical adsorption, X-ray photoelectron spectroscopy, and thermogravimetric analysis-mass spectroscopy. The catalyst had good catalytic performance for the ethylbenzene oxidative dehydrogenation with carbon dioxide. The deactivation of catalyst was mainly due to the coke deposition, and the deactivated catalyst could be easily regenerated on-site by diluted air. The catalytic activity of the regenerated catalyst was very close to that of the fresh one.

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Effect of Water Vapor at Room Temperature on Photocatalytic Decomposition of Gaseous Ozone over Au/TiO2 YANG Dongmei, HE Panke, DONG Fang, ZHANG Min, YANG Jianjun* 2006, 27 (12):  1122-1126.  Abstract ( 2077 )   [Full Text(HTML)] () PDF (325KB) ( 839 )   The Au/TiO2 photocatalyst was prepared by the deposition-precipitation method and was characterized by UV-Vis diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy. The influence of water vapor at room temperature on the photocatalytic activity of Au/TiO2 for ozone decomposition was studied. The results showed that the catalytic activity of Au/TiO2 decreased significantly when water vapor was introduced into the dried feed gas. In addition, the ozone removal rate over Au/TiO2 reached a steady value rapidly. The results of O 1s and Au 4f XPS showed that the surface structure of TiO2 was changed, and the interaction between the gold and the support was weakened in the presence of water vapor, which was responsible for the decrease in the photocatalytic activity of the catalyst.

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Preparation of Ni2P Catalyst from Amorphous Ni-P at Low Temperature and Its Catalytic Performance for Dibenzothiophene Hydrodesulfurization SONG Limin, LI Wei*, ZHANG Minghui, TAO Keyi 2006, 27 (12):  1127-1132.  Abstract ( 2123 )   [Full Text(HTML)] () PDF (541KB) ( 897 )   Ni2P/SiO2-Al2O3 catalysts were successfully prepared by treating amorphous Ni-P alloys with phosphine at low temperature. The as-prepared catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), inductively coupled plasma atomic emission spectroscopy, N2 adsorption, and X-ray photoelectron spectroscopy (XPS). The XRD data showed that the amorphous Ni-P/SiO2-Al2O3 precursors could be completely transformed to crystalline Ni2P/SiO2-Al2O3 at 200-300 ℃. The crystalline structure of Ni2P became more prominent with increasing phosphatization temperature. The results of TEM indicated that Ni-P and Ni2P particles were both 40-50 nm in diameter and were well dispersed on the supports. The XPS results suggested that the main components were Ni2P and Ni3(PO4)2 on the surface of both Ni2P and Ni2P/SiO2-Al2O3. The Ni2P/SiO2-Al2O3 catalysts showed good activity for dibenzothiophene hydrodesulfurizationunder the experimental conditions.

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Preparation of Molybdenum Disulfide Composite Pillared by Hydroxy-Chromium Oligocations and Its Catalytic Activity for Benzene Hydrogenation ZHANG Jinfei, LIN Bizhou*, SUN Dongya, XU Baihuan, DING Cong 2006, 27 (12):  1133-1138.  Abstract ( 1922 )   [Full Text(HTML)] () PDF (313KB) ( 778 )   The molybdenum disulfide composite material pillared by hydroxy-chromium oligocations ［Cr4(OH)6-(H2O)10］6+ with the basal interlayer space from 1.319 to 1.341 nm was prepared by intercalating the hydroxy oligocations into the interlayers of molybdenum disulfide using the single-molecular-layer technology. X-ray diffraction showed that the hydroxy-chromium oligocations can be used as a stable pillaring agent after aging at 70 ℃ for four days, and a pillared composite with high crystallinity can be obtained at a small Cr/Mo molar ratio and small Cr3+ concentration in the reaction system. Compared with the pristine 2H-MoS2, the pillared composite exhibited larger interlayer space, smaller crystallite size, larger specific surface area, and better thermal stability. The results of liquid-phase benzene catalytic hydrogenation showed that the catalytic activity of the pillared composite was evidently superior to that of the pristine 2H-MoS2 and the Raney Ni catalysts, and the composite with higher crystallinity displayed even better catalytic activity and repeatability.

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Dispersion Threshold and Threshold Effect of Ni/AC Catalyst LIU Jinhong1,2*, ZHANG Qian1, YAO Huqing1 2006, 27 (12):  1139-1143.  Abstract ( 2132 )   [Full Text(HTML)] () PDF (421KB) ( 729 )   The nickel catalysts supported on activated carbon were prepared by the impregnation method. The effects of nickel precursors, such as Ni(NO3)2, NiAc2, and NiCl2, and solvents of dipping solution, such as water and ethanol, on the Ni dispersion degree were studied by X-ray diffraction(XRD) and thermogravimetry (TG). The XRD results showed that when the calcination temperature was 550 ℃ and water was used as the solvent, the nickel threshold was 0.065 g/g using Ni(NO3)2 as precursor and 0.058 g/g using NiAc2 as precursor. The threshold of the catalyst with the Ni(NO3)2 precursor was 0.082 g/g in methanol and larger than that in water. Anions of nickel salts and solvents of dipping solution influenced the interaction between the active substance and support, which resulted in different dispersion capacity. The threshold obtained by TG was smaller than that by XRD. The results of catalyst performance experiments indicated the threshold effect of supported Ni catalysts existed in the carbonylation of methanol to produce acetic acid.

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The Structure of TiO2/Hydroxyapatite and Its Photocatalytic Performance in Degradation of Aldehyde HU Maocong, ZHONG Shunhe* 2006, 27 (12):  1144-1148.  Abstract ( 2103 )   [Full Text(HTML)] () PDF (357KB) ( 1008 )   The Structure of TiO2/Hydroxyapatite and Its Photocatalytic Performance in Degradation of Aldehyde

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Synthesis and Catalytic Applications of Novel Composite Molecular Sieves XU Ling, XU Haiyan, WU Tonghao*, WU Shujie, KAN Qiubin* 2006, 27 (12):  1149-1158.  Abstract ( 2028 )   [Full Text(HTML)] () PDF (445KB) ( 1258 )   Composite molecular sieves are a kind of new material greatly concerned by researchers. The development of the synthesis and applications of different composite molecular sieves, involving micro-microporous composite molecular sieves, micro-mesoporous composite molecular sieves, micro-macroporous composite molecular sieves, meso-macroporous and micro-meso-macroporous composite molecular sieves was reviewed. The prospects for composite molecular sieves was expected.

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Polyols: A New Generation of Energy Platform YAN Ning, ZHAO Chen, GAN Weijia, KOU Yuan* 2006, 27 (12):  1159-1163.  Abstract ( 2223 )   [Full Text(HTML)] () PDF (266KB) ( 1635 )   In the new energy strategy based on biomass, polyols are becoming a new generation of green energy platform. Polyols can be obtained from biomass by pyrolysis, catalytic pyrolysis, and intercepted dilute acid hydrolysis. They can be converted to biofuels, chemicals, and hydrogen by processes such as aqueous-phase reforming and Fischer-Tropsch synthesis under mild conditions. In this study, pioneer developments on the utilization of polyols to prepare biofuels and chemicals, light-induced decomposition of polyols to hydrogen, and exploring study on the catalytic hydrogenation and intercepted dilute acid hydrolysis of cellulose to polyols have been reviewed. The simple application of current industrial techniques on cellulose conversion is immediately available, whereas the processes in deed are far from high efficiency, low energy cost, large scale, and green. Therefore, new chemistry on one-step conversion of cellulose is being highly expected. The utilization of new concepts combining techniques in a state of the art shows great potentials in the conversion of polyols, but the approaches still keep a long distance from the simplicity, energy efficiency, cheap, and environmentally benign. Hence novel catalysis to realize “one-pot” and “one-step” conversion is also highly expected in the future.