催化学报 ›› 2022, Vol. 43 ›› Issue (4): 928-955.DOI: 10.1016/S1872-2067(21)63924-4
王春鹏a,†, 王哲b,c,†, 毛善俊a,c, 陈志荣b,c, 王勇a,c,*()
收稿日期:
2021-07-18
接受日期:
2021-07-18
出版日期:
2022-03-05
发布日期:
2022-03-01
通讯作者:
王勇
作者简介:
第一联系人:†共同第一作者
基金资助:
Chunpeng Wanga,†, Zhe Wangb,c,†, Shanjun Maoa,c, Zhirong Chenb,c, Yong Wanga,c,*()
Received:
2021-07-18
Accepted:
2021-07-18
Online:
2022-03-05
Published:
2022-03-01
Contact:
Yong Wang
About author:
Yong Wang received his BS degree from Xiangtan University and his PhD degree from Zhejiang University. After a postdoctoral stay at the Department of Chemistry, Zhejiang University, he joined the Max Planck Institute for Colloids and Interfaces in Potsdam/Germany in 2009. He rejoined Zhejiang University and became a professor for Chemistry in 2011. Now he is Ph.D. supervisor, director of the Institute of Catalysis at the Department of Chemistry in Zhejiang University. He was included in the Highly Cited Researcher list by Clarivate Analytics 2020 and 2021 (Web of Science™, Thomson Reuters) in the field of Cross-Field and Chemistry, respectively. His research group has been focusing on the basic science and applied research for the design and development of novel materials for heterogeneous catalysis and energy conversion. The group strives to pursue green energy technologies and the fundamental science that make these technologies a reality. He joined the Editorial Board of Chin. J. Catal. in 2020.†Contributed to this work equally.
Supported by:
摘要:
多相催化技术在化工产业中一直发挥着重要作用, 近年来也被广泛应用于燃料电池、绿色化学、纳米技术、生物技术等新兴领域. 其中, 金属催化剂在加氢、氧化、氢甲酰化、偶联等多种反应中表现出较高的催化效率. 然而社会发展对金属催化剂的效率提出了更高的要求, 针对特定反应, 开发兼具高活性、高选择性和优良稳定性的理想催化剂一直是学术界和工业界的研究热点. 而全面理解金属催化剂活性中心的配位结构与催化性能之间的构-效关系, 将为开发先进催化剂提供更充分的理论指导. 在金属催化剂中, 担任活性中心的金属位点在邻近位置上通常存在一些与之直接键合的配位原子/离子, 同时次邻近或更远位置的原子/离子也会以电荷传递、晶格张力等方式影响着金属中心的结构, 此外周围原子呈现出的空间分布也会营造出特定的立体环境, 影响着底物、中间体等与金属中心的作用, 以上诸类因素都称为金属中心的配位环境. 这些因素的变化会显著影响金属中心与反应物、中间体以及产物之间的相互作用, 进而改变反应机理以及催化剂的性能. 深入解析影响金属中心配位环境的主要因素以及金属催化剂在反应过程中的构-效关系, 并在原子水平上精准调控其微纳结构, 既可以深化对多相催化反应原理的理解, 也可以为合理设计出新一代高活性、高选择性、高稳定性的工业催化剂提供帮助. 但在很多情况下, 金属催化剂活性中心结构的复杂性阻碍了人们从原子水平深入理解催化反应机制, 从而使得合理设计高性能金属催化剂变得更加困难. 近年来先进的表征技术大量涌现, 为准确分析金属中心微纳结构和反应机理提供了诸多便利.
本综述首先系统总结了金属颗粒的尺寸和形貌、载体的种类和性质、多组分合金的结构、有机配体的修饰等因素对金属中心配位环境及催化性能的影响规律; 然后, 详细分析了X射线光电子能谱、X射线吸收精细结构谱、扫描透射电子显微镜等表征手段在确立金属中心配位环境方面的作用, 尤其是反应工况下金属微纳结构动态变化的原位表征技术显著提升了现代催化科学在反应机理方面的认识. 上述对于催化中心精细结构以及微观反应机制的认识和总结可为构建性能优异、应用广泛的新一代金属催化剂提供理论指导和借鉴.
王春鹏, 王哲, 毛善俊, 陈志荣, 王勇. 多相催化剂活性位点的配位环境及其对催化性能的影响[J]. 催化学报, 2022, 43(4): 928-955.
Chunpeng Wang, Zhe Wang, Shanjun Mao, Zhirong Chen, Yong Wang. Coordination environment of active sites and their effect on catalytic performance of heterogeneous catalysts[J]. Chinese Journal of Catalysis, 2022, 43(4): 928-955.
Fig. 2. (a) Fraction of surface atoms in uniform truncated octahedron nanoparticles a function of Au particle size. Reproduced with permission from Ref. [20]. Copyright 2007 Elsevier. (b) Relationship between the activity of CO oxidation at 300 K and the average size of the Au clusters supported over TiO2. Reproduced with permission from Ref. [40]. Copyright 1998, Science AAAS.
Fig. 3. (a) Selectivity change in p-CNB hydrogenation on serial Pt/CeO2 catalysts with different Pt loadings. (b) The energy barriers (Ea) of dehalogenation for p-CAN versus the cone angle of Pt on Pt-based catalyst models. (c) The 0.005 e-/Å3isosurfaces of C-Cl π* orbitals (unoccupied) and non-bonding orbitals of Cl in p-CAN molecule. (d-f) The orbital analysis between p-CAN and different coordinated Pt sites: (d) Pt1/CeO2; (e) Pt/(111); (f) Pt-edge. (g) High-resolution valence-band Pt 5d XPS in different sized-Pt/SiO2 relative to the VBM, as an analogue of the density of states. Positions of the d-band centers was indicated as the black lines. (h) The corresponding catalytic activities in hydrogenation of quinoline at room temperature and ambient (balloon) hydrogen pressure against diameter of the PtNPs. Panels (a)-(f) reproduced with permission from Ref. [30]. Copyright 2020, Elsevier. Panels (g) and (h) reproduced with permission Ref. [62]. Copyright 2016, Wiley.
Fig. 4. (a) Sketch maps of metal nanoparticles in different shape: tetrahedron (a1), octahedron (a2), cube (a3) and cuboctahedron (a4). The tetrahedron and octahedron only exhibit the (111) facets. Reproduced with permission from Ref. [65]. Copyright 2010, American Chemical Society. (b,c). Schematic of different surfaces in face-centered cubic (FCC) and body-centered cubic (BCC) lattice. (b1) (111), (b2) (100) and (b3) (110) of FCC. (c1) (111), (c2) (100) and (c3) (110) of BCC.
Fig. 5. TEM images of Pd1/Cu (111) (a) and Pd1/Cu (100) (b); (c) Hydrogenation activity of Cu(100) and Cu(111) surface supported single-atom Pd with varied Pd loading; (d) Evolution of the onset temperature for 2-propanol oxidation over Pt NPs/γ-Al2O3 versus the average number of missing bonds (related to the population of low-coordinated atoms) on the NP surface; (e) The percentage of atoms at corners/edges and faces on the NP surface, respectively. Panels (a)-(c) reproduced with permission from Ref. [69]. Copyright 2019 Springer Nature. Panels (d,e) reproduced with permission from Ref. [75]. Copyright 2010, American Chemical Society.
Fig. 6. (a) A synthetic scheme of Pt NSs/CNTs and Pt NPs/CNT; (b-d) HRTEM images of the periphery of intermediate Pt(OH)x/Pt species during the reduction process; (e-g) Polarization curves (scan rate: 50 mV/s), calculated TOF and number of active sites at the voltage of -0.1 V, and mass activity at a given voltammetry over different shaped-Pt catalysts. Reproduced with permission from Ref. [71]. Copyright 2020, Elsevier.
Entry | Catalyst | Application | Performance a | Ref. |
---|---|---|---|---|
1 | Pd/CN0.132 | Hydride oxygenation of vanillin | con. 100%, sel. 100% | [ |
2 | Pd/AC | con. 98%, sel. 74% | ||
3 | Pd/HPC-NH2 | con.100%, sel. 99.3% | [ | |
4 | Pd/HPC | no-reactivity | ||
5 | Pd/NPC-ZIF-8 | TOF 100 h-1 | [ | |
6 | Pd/AC | TOF 22 h-1 | ||
7 | PdZn/CN@ZnO | Semi hydrogenation of alkynols | TOF 434 h-1 | [ |
8 | PdZn/ZnO | TOF 74 h-1 | ||
9 | Pd/CN@MgO | aldol condensation- hydrogenation of furfural | con. > 99%, sel. 82% | [ |
10 | Pd/MgO | con. 86%, sel. 42% |
Table 1 Catalytic performance of metal/N-doped carbon catalysts employed for various heterogeneous reactions.
Entry | Catalyst | Application | Performance a | Ref. |
---|---|---|---|---|
1 | Pd/CN0.132 | Hydride oxygenation of vanillin | con. 100%, sel. 100% | [ |
2 | Pd/AC | con. 98%, sel. 74% | ||
3 | Pd/HPC-NH2 | con.100%, sel. 99.3% | [ | |
4 | Pd/HPC | no-reactivity | ||
5 | Pd/NPC-ZIF-8 | TOF 100 h-1 | [ | |
6 | Pd/AC | TOF 22 h-1 | ||
7 | PdZn/CN@ZnO | Semi hydrogenation of alkynols | TOF 434 h-1 | [ |
8 | PdZn/ZnO | TOF 74 h-1 | ||
9 | Pd/CN@MgO | aldol condensation- hydrogenation of furfural | con. > 99%, sel. 82% | [ |
10 | Pd/MgO | con. 86%, sel. 42% |
Fig. 7. (a) Adsorption configurations of metal particles and corresponding adsorption energies of NPs on different carbon supports. GP: undoped graphene; NG: Ng doped-graphene; PNG: Np doped-graphene. The scheme of the electron transfer between NPs and different carbon supports. Blue means occupied electrons. The values represent Fermi levels against the vacuum. White circle denotes the electron deficiency of the carbon atoms bound to Ng. (b) Catalytic performance of Pd-based catalysts over different supports in the additive-free dehydrogenation of FA; (c) XPS spectra of Pd 3d for Pd-based catalysts on varied supports; (d) Possible reaction pathway for the dehydrogenation of FA over Pd/NHPC-NH2. Panels (a-c) reproduced with permission from Ref. [105]. Copyright 2019, Elsevier. Panels (d-f) reproduced from Ref. [107]. Copyright 2019, Royal Society of Chemistry.
Fig. 8. Calculated energy profiles of C-O bond cleavage of C4H9OH (a) and C6H5OH (b) over NbOPO4(100) (black line) and Re2O7(010) (red line) surfaces, respectively. (c) The isosurfaces of charge density difference for O and OH adsorption on NbOPO4(100) and Re2O7(010) surfaces. (d) The d-orbital projected density of states for the surface Nb5c and Re5c atoms. Panels (a)-(d) were all adapted with permission from Ref. [125]. Copyright 2016, Springer Nature. High resolution STEM Z-contrast image of 2%Pt/α-MoC (e) and 0.2%Pt/α-MoC (f) with the single Pt atoms circled; (g) The catalytic activity of based Pt/MoC samples with a changed molar percentage of α-MoC and the corresponding fitted coordination numbers of Pt-Pt and Pt-Mo shells; (h) The long-term stability of the 0.2%Pt/α-MoC catalysts. Reaction was carried in the condition of n(CH3OH):n(H2O)= 1:1. TTN, total turnover number. Panels (e)-(h) were all adapted with permission from Ref. [128]. Copyright 2017, Springer Nature.
Fig. 9. (a) Schematic representation of main metal-support interactions between metal NPs and supports; XPS spectra of single Pt atom over Co3O4, CeO2, ZrO2 and graphene in the Pt 4f region (b) and the corresponding catalytic performance of Pt1 SACs in hydrolytic dehydrogenation of ammonia borane for room-temperature (c). Panels (b) and (c) reproduced with permission from Ref. [130] Copyright 2019, American Chemical Society. (d) Representative HRTEM images of an individual Pd nanocrystal supported on In2O3 under reducing atmospheres; (e) The catalytic performance of Pd/In2O3 catalysts treated at different reduction temperatures in the MBY semi-hydrogenation reaction. Panels (d) and (e) adapted with permission from Ref [109]. Copyright 2019, Royal Society of Chemistry. (f) Calculated fraction of sites with a specific geometry (surface and perimeter or corner atoms in contact with the support) and turnover frequency (TOF) based on the total metal atom for CO oxidation on CeO2 supported Ni, Pd, and Pt catalysts as a function of metal particle size. Adapted with permission from Ref. [131] Copyright 2013, Science AAAS.
Fig. 10. (a) Structure diagram of geometrical effects caused by alloying affect; (b) In situ infrared spectra over the Pt/Al2O3 and PtSn/Al2O3 during PDH reaction. The mainly pathways including dehydrogenation and cracking and the corresponding reaction energy of the steps catalyzed by Pt (111) and PtSn (102). Panels (b) adapted with permission from Ref. [172]. Copyright 2020, Wiley. (c) Energy Level illustration for Pt 5d Valence Bands in Pt/SiO2 and Pt1Zn1/SiO2 and the corresponding catalytic behavior in the ethane dehydrogenation reaction. Reproduced with permission from Ref. [177]. Copyright 2017, American Chemical Society.
Fig. 11. (a) The adsorption configuration model of HHDMA molecules on Pd(111). Reproduced with permission from Ref. [198]. Copyright 2014, Wiley. (b) Structured models of bare Pt NW and EDA-Pt NW and their corresponding Bader charge analysis; (c) Free energies for the adsorption of N-containing aromatics on the EDA-Pt NWs. Adapted with permission from Ref. [203]. Copyright 2016, Springer Nature.
Fig. 12. HAADF-STEM (a) and HRTEM (b) images of the as-prepared Pd/HPC-NH2. (c) The catalytic performance of Pd/HPC and Pd/HPC-NH2 in the hydrodeoxygenation of vanillin reaction using the FA as hydrogen source; (d) The conversion rate of benzaldehyde (BAL) under different HDO systems at 30 °C. The conversion rate was calculated based on the mass of Pd in Pd/HPC-NH2 catalyst at the conversion of ~10%. Panel (a)-(d) were reproduced with permission from Ref. [101]. Copyright 2021, Elsevier. HRTEM (e) and HAADF-STEM (f) images of Pd/NHPC-DETA-50; Catalytic selectivity (g) and activity (h) of the selective hydrogenation of MBY with different Pd catalysts. Adapted with permission from Ref. [206]. Copyright 2021, American Chemical Society.
Fig. 13. (a) In situ AC-STEM images of isolated Pt atom over TiO2 at different annealing conditions: 300 °C, 760 torr of O2 (a1); 250 °C, 760 torr of 5% H2 (a2); 450 °C, 760 torr of 5% H2 (a3). The same Pt single atom was identified by the yellow circles in the a1-a3. (a4) The normalized intensity profile of a line scan shown in (a1) and (a3). Panel (a) was adapted with permission from Ref [26]. Copyright 2019, Springer Nature. (b) In situ-ETEM images of Au/TiO2 and corresponding FFT patterns in different environments. (c) In situ-ETEM images showing the structural evolution of the Au-TiO2 under different reactive environment. Panels (b) and (c) reproduced with permission from Ref. [209]. Copyright 2021, Science AAAS.
Fig. 14. (a) Operando HERFD-XANES spectra of Pt-SS recorded at different temperatures under steady-state reaction conditions; (b) Catalytic activity during the HERFD-XANES experiments versus fraction of Pt4+, Pt2+, Ptδ+with adsorbed CO and the PtXδ+clusters, obtained by linear combination analysis using MCR-ALS as references; (c) Diagram for the reversible formation of the catalytically active PtXδ+cluster based on result of operando HERFD-XANES (grey, Pt; yellow, Ce; red, O; dark grey, C); (d) HERFD-XAS spectra of Pt-SS treated in different condition. MCR-ALS-derived references (e) and calculated HERFD-XANES (f) using relaxed Pt-SS structures on the 110 facet (indexed (i)-(iii)) and on the 111 facet (indexed (iv)) determined by DFT. Reproduced with permission from Ref. [221]. Copyright 2020, Springer Nature.
Fig. 15. The quasi in situ Pd 3d spectra for Pd NPs on AC (a) and CN (b) supports, and N 1s (c) before and after exposure in air. Panels (a)-(c) reproduced with permission from Ref. [105]. Copyright 2019, Elsevier. (d) In situ Pd 3d5/2 spectra of Pd foil under acetylene, propyne, and 1-pentyne selective hydrogenation; (e) Schematic representation of Pd catalysts operating in the selective and unselective alkyne hydrogenation regimes; (f) Relationship between Rh/Pd atomic fractions of as-synthesized Rh0.5Pd0.5 NPs and photoelectron KE and mean free path measured at 25 °C in UHV; (g) Evolution of Rh and Pd atomic fractions, the fraction of the oxidized Rh (left y axis) and Pd atoms (right y axis) in the Rh0.5Pd0.5 NPs at 300 °C under different conditions denoted in the x axis. Panels (d,e) and (f,g) were reproduced with permission from Ref [227] and Ref [232]. Copyright 2008, Science AAAS, respectively.
Fig. 16. (a) Catalytic performance of 3% Pt/CeO2 with different ratios of Pt/p-CNB. Infrared spectroscopy of CO adsorption on different catalysts: (b) fresh 3% Pt/CeO2 samples and used 3% Pt/CeO2 samples with Pt/p-CNB ratio of 2.3 wt‰ (c) and 31.7 wt‰ (d) in the reaction. Reproduced with permission from ref. [30]. Copyright 2020, Elsevier.
Fig. 17. In situ DRIFT spectra of CO adsorption and following O2 purging treatment over Pt/SiO2 and Pt/Al2O3 (a) and Pt/TiO2 and Pt/ZrO2 (b). (c,d) HAADF images of the as-synthesized 1 wt% Pt/SiO2. Arrows indicate the single atoms. Inset was the magnified image. (e) IR spectra of CO adsorbed over Pt/SiO2 before and after O2 treatment. The difference spectrum indicated the CO had been removed by O2; Kubelka-Munk unit is used for quantification. (f) CO2 signal in MS during the TPO process of the preadsorbed CO on Pt/SiO2. Reproduced with permission from Ref. [241]. Copyright 2015, Science AAAS.
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