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Chinese Journal of Catalysis
2009, Vol. 30, No. 2
Online: 25 February 2009

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Synthesis of Carbon-Doped TiO2 Using Porous Resin and Its Excellent Photocatalytic Properties HE Dongliang;MENG Xiangju;TAO Yanchun;ZHANG Lin;XIAO Fengshou* 2009, 30 (2):  83-85.  Abstract ( 2014 )   [Full Text(HTML)] () PDF (261KB) ( 1088 )   Carbon-doped TiO2 with large surface area has been successfully synthesized b y h ydrolysis of tetrabutyl titanate in the pores of resin and calcination in nitrog en and air. The use of resin not only realizes carbon doping in TiO2 but also li mits the aggregation of TiO2 nanocrystals. The carbon-doped TiO2 exhibits h igher activity than P25 under the irradiation of both visible and UV light.

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Oxidative Dehydrogenation of 9,10-Dihydroanthracene Catalyzed by 2,3-Dichloro-5,6-dicyano-1,4-benzoquinone/NaNO2 ZHANG Wei;MA Hong;ZHOU Lipeng;MIAO Hong;XU Jie* 2009, 30 (2):  86-88.  Abstract ( 1958 )   [Full Text(HTML)] () PDF (182KB) ( 1043 )   A catalyst comprising 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) and N aNO2 for 9,10-dihydroanthracene oxidative dehydrogenation showed high catalyt ic effi c iency, with >99% conversion of 9,10-dihydroanthracene and 99% selectivity for anthracene at 120 ℃ and 1.3 MPa O2 for 8 h.

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Preparation of Silica Sol-Supported NiB Nanoclusters and Their Catalytic Hydrogenation Performance YAN Hong;LI Wei*;ZHANG Minghui;TAO Keyi 2009, 30 (2):  89-91.  Abstract ( 1933 )   [Full Text(HTML)] () PDF (269KB) ( 905 )   Amorphous NiB supported on silica sol was synthesized by chemical reduction. The size of active Ni was 1-2 nm, and the distribution of the c omponents was regular. NiB/silica sol exhibited a higher hydrogenation activity than commercial Raney Ni.

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Effect of the Reduction Temperature of Co-La-Zr/AC on the Synthesis of Higher Alcohols from Syngas JIAO Guiping;DING Yunjie;*;ZHU Hejun;LI Xianming;DONG Wenda;LI Jingwei;L Yuan 2009, 30 (2):  92-94.  Abstract ( 2102 )   [Full Text(HTML)] () PDF (205KB) ( 894 )   The Co-La-Zr/AC catalyst reduced at 703 K showed good activity for CO hydroge nat ion to higher alcohols under the typical conditions of FT synthesis. Co2C spec ie s, which may play an important role in the synthesis of higher alcohols, were de tected by XRD in the used catalyst. The reduction temperature affects both the c obalt dispersion and formation of Co2C species.

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Scandium-Doped La0.8Sr0.2MnO3-δCathode Materials for Intermediate-Temperature Solid Oxide Fuel Cells YUE Xiangling;LIU Lin;ZHANG Min;YANG Min;DONG Yonglai;CHENG Mojie* 2009, 30 (2):  95-103.  Abstract ( 2393 )   [Full Text(HTML)] () PDF (688KB) ( 1111 )   The Sc-doped LSM (La0.8Sr0.2Mn1-xScxO3-δ , x=0, 0.02, 0.05, and 0.1) as cathode materials for intermediate-tempera ture solid oxide fuel cells was synthesized using a modified Pechini method. The Sc -doped LSM-YSZ composite cathodes showed higher performance than the LSM-YSZ composite cathode at low operating temperatu re, which is primarily ascribed to the increase in the oxygen anionic vacancies resulted from the Sc partial substitution for Mn sites.

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Low-Temperature Selective Catalytic Reduction of NO with NH3 over MnOx-CeO2/ZrO2-TiO2 Monolith Catalyst LI Wei;LIN Tao;ZHANG Qiulin;GONG Maochu;CHEN Yaoqiang* 2009, 30 (2):  104-110.  Abstract ( 2349 )   [Full Text(HTML)] () PDF (429KB) ( 793 )   The catalysts of MnOx-CeO2/TiO2 (T) and MnOx-CeO2/ZrO2- TiO2 (ZT) were prepared by calcination at different temperatures (500, 600 , 7 00, and 800 ℃). Compared with the T catalysts, ZT catalysts exhibit better low -temperature SCR activity, wider reaction temperature window, and higher NO co nversion. ZT6 (MnOx-CeO2/ZrO2-TiO2 calcined at 600 ℃) showed the best low-temperature SCR activity and favorable stability at high temperature.

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Effect of Thermal Treatment under Nitrogen on the Ammonium Thiosulfate-Presulfidized Mo/Al2O3 Catalyst GE Hui;LI Xuekuan*;FAN Weibin;QIN Zhangfeng;L Zhanjun;WANG Jianguo 2009, 30 (2):  111-118.  Abstract ( 2258 )   [Full Text(HTML)] () PDF (682KB) ( 927 )   The (NH4)2S2O3-presulfidized Mo/Al2O3 catalyst pretreated with N2 at 80 ℃ gave the highest thiophene conversion. This is due to the modification of the Al2O3 support by sulfate ions, forming a highly active Type II MoS2 st ructure. Whereas an increase in the N2-pretreatment temperature above 200 ℃ led to a decomposition of (NH4)2S2O3, forming less active Type I MoS2 structure.

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Acidity Characterization of HZSM-35 Zeolite by Solid-State NMR LIU Yong;ZHANG Weiping*;XIE Sujuan;XU Longya;HAN Xiuwen;BAO Xinhe* 2009, 30 (2):  119-123.  Abstract ( 2046 )   [Full Text(HTML)] () PDF (295KB) ( 811 )   The diffusion of deuterated pyridine molecules into the cavities of eight-membe red ring pores was very slow, and it took a long time to reach the adsorption eq u ilibrium at 300 ℃. After adsorption of deuterated pyridine, the 1H MAS NM R spectra showed that there were two types of Brnsted acidic sites with differ ent strength in both the 10-MR channels and 8-MR cavities.

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Preparation and Three-Way Catalytic Performance of Cu-Ce-Zr-O Mixed Oxide Catalysts GUO Xikun*;JIA Haijian;FAN Qianyu;LI Wenyan;LIU Weiming 2009, 30 (2):  124-130.  Abstract ( 2321 )   [Full Text(HTML)] () PDF (557KB) ( 786 )   A mixed oxide three-way catalyst Cu-Ce-Zr-O, which could efficiently purify the automobile exhaust, was prepared using non-precious metal. Under lean-bu rn conditions (air/fuel ratio of 1.33), the catalyst showed better three-way c a talytic performance. The light-off temperatures for CO, C3H6, and NO were 1 83, 257, and 236 ℃, respectively; and the complete conversion temperatures for the t hree gases were 197, 340, and 286 ℃, respectively. At low working temperature, NO, CO, and C3H6 could be converted into innoxious gases.

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Preparation and Electrochemical Performance of (La,Sr)(Co,Fe)O3-δCathode for Solid Oxide Fuel Cells CHEN Jing;LIANG Fengli;LIU Lina;PU Jian;CHI Bo;LI Jian* 2009, 30 (2):  131-136.  Abstract ( 2295 )   [Full Text(HTML)] () PDF (485KB) ( 758 )   LSCF electrodes with different structure for SOFC were prepared by impregnation and screen printing, respectively. Enhancement in the electrode m icrostructure and cell performance was substantial, showing the great potential of the impregnation method in the development of high performance and nano- structured electrodes, with specific functions.

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Synthesis of Visible Light Responsive B-Doped TiO2 by Hydrothermal Method and Its Photocatalytic Activity in Phenol Degradation YU Aimin;WU Guangjun;YAN Jingjing;ZHENG Chunming;ZHANG Fuxiang;YANG Yali;GUAN Naijia* 2009, 30 (2):  137-141.  Abstract ( 2416 )   [Full Text(HTML)] () PDF (486KB) ( 958 )   Boron-doped TiO2 was successfully synthesized by the hydrothermal method. In the as-synthesized samples, B-O-Ti bonds were formed. Phenol degradation was used as a probe reaction to evaluate the photocatalytic activity of B-doped TiO 2 under UV and visible light, and an excellent photocatalytic activity (100% p henol degradation in 5 h) was achieved.

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Degradation of Methyl Orange over Fe2+Activated Sulphonated Carbon Catalyst QU Zhenping*;TANG Xiaolan;LI Xinyong;CHEN Kai;MA Ding 2009, 30 (2):  142-146.  Abstract ( 2352 )   [Full Text(HTML)] () PDF (390KB) ( 951 )   The sulphonated carbon materials made from glucose were used as the solid acid i n Fenton reaction, and the effects of the structure of the carbon materials prep ared by different methods on the degradation efficiency of methyl orange were me asured. The Fe2+ activated sulphonated carbon catalyst prepared by the hyd rothermal metho d exhibited better catalytic performance than that prepared by the direct heatin g method.

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Photocatalytic Activity of K2La2Ti3O10Doped with B for Hydrogen Production from Water Splitting YANG Yahui;*;CHEN Qiyuan;LI Jie 2009, 30 (2):  147-153.  Abstract ( 2299 )   [Full Text(HTML)] () PDF (505KB) ( 923 )   The layered perovskite type oxide, K2La2Ti3O10 doped with B, exhibit ed high photocatalytic activity for hydrogen production. The optimum doping c oncentration of B was 0.01∶1(B∶Ti), and the ultraviolet hydrogen production rate was 157.1 μmol/(L·h), which was raised by 166% compared with undoped K 2La2Ti3O10. The optimum doping concentration of B was 0.02∶1, and t he visible hydrogen production rate was 85.2 μmol/(L·h), which was 5.2 times t hat undoped K2La2Ti3O10.

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Preparation of Ce-Doped Ti/TiO2 Electrodes and Its Catalytic Performance for Degradation of Oil-Field Wastewater ZHANG Yi;YU Ting*;ZHANG Yujie;WU Shengwen 2009, 30 (2):  154-158.  Abstract ( 2207 )   [Full Text(HTML)] () PDF (327KB) ( 846 )   Ce-doped Ti/TiO2 electrodes were prepared by the sol-gel method under the op timal conditions of temperature of 450 ℃, time of 90 min, and doping amount of Ce 1 .5%. Ce doping enhanced the catalytic pe rformance of the electrode. The chemical oxygen demand reduction of oil-field w as tewater was up to 80% after 90 min treatment with the Ce-dope d Ti/TiO2 electrode.

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Alkali Treatment for Improving Isomerization Performance of Pt/ZSM-5 SONG Yueqin;LIU Feng;KANG Chenglin;FENG Yanlong;ZHOU Xiaolong*;DONG Renyao;XU Longya 2009, 30 (2):  159-164.  Abstract ( 2023 )   [Full Text(HTML)] () PDF (365KB) ( 852 )   ZSM-5 samples were prepared by alkali treatment under different conditions. The acidity and pore structure o f ZSM-5 had significant effect on n-hexane isomerization performance of P t/ZSM-5. The increase in strong acid sites led to an enhancement in n- hexane conversion. The creation of mesopores was favorable for the formation of dimethyl butane.

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The Dispersion Characteristics of Molybdenum and Tungsten on Alumina Surface LI Huifeng;LI Mingfeng*;CHU Yang;XIA Guofu;NIE Hong 2009, 30 (2):  165-170.  Abstract ( 1986 )   [Full Text(HTML)] () PDF (349KB) ( 1251 )   After the ammonia extraction, polymeric Mo (W) species (easily forming active Mo S2(WS2) after sulfiding) and bulk MoO3(WO3) were removed, wh ile the residual metal species still have a strong interaction with alumina surf a ce. However, by further calcination, a new equilibrium, depending on th e surface characteristics of alumina, can be reached by their redispersion on al umina surface.

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XPS Study on CuZnAl Catalysts Prepared by Different Methods for Direct Synthesis of Dimethyl Ether LI Zhihong;HUANG Wei*;ZUO Zhijun;SONG Yajun;XIE Kechang 2009, 30 (2):  171-177.  Abstract ( 1987 )   [Full Text(HTML)] () PDF (434KB) ( 802 )   CuZnAl catalyst samples prepared by the complete liquid-phase technology (CLT) ha d high stability for synthesis of dimethyl ether in a slurry-bed reactor. The i n vestigation focused on the effect of preparation methods on chemical states of C u a nd Zn species on catalyst surface by X-ray photoelectron spectroscopy. The form i ng surroundings of the catalyst would cause alteration in its surface structure and properties.