催化学报 ›› 2022, Vol. 43 ›› Issue (3): 611-635.DOI: 10.1016/S1872-2067(21)63899-8
收稿日期:
2021-04-29
修回日期:
2021-04-29
出版日期:
2022-03-18
发布日期:
2022-02-18
通讯作者:
邹晓新
基金资助:
Hui Chena, Bo Zhangb, Xiao Lianga, Xiaoxin Zoua,*()
Received:
2021-04-29
Revised:
2021-04-29
Online:
2022-03-18
Published:
2022-02-18
Contact:
Xiaoxin Zou
About author:
Xiaoxin Zou has received his Ph.D. in inorganic chemistry from Jilin University (China) in June 2011; and then moved to the University of California, Riverside, and Rutgers, The State University of New Jersey, as a postdoctoral scholar from July 2011 to October 2013. He is currently a professor at the State Key Laboratory of Inorganic Synthesis and Preparative Chemistry in Jilin University. His research interests are in hydrogen energy materials chemistry, comprising the elucidation of the atomic basis for water-splitting electrocatalysts, the prediction and searching of efficient catalysts with novel crystal structures as well as the development of original catalyst design principles. Some of his recent progresses include the computation-driven structural design/engineering of water splitting catalysts, the structural understanding and synthetic methods of interstitial intermetallic catalysts, the design principles of low-iridium oxygen-evolution catalysts for PEM electrolyzers, and the synthetic strategies of large-area, highly stable electrode materials. He has authored 80+ peer-reviewed papers and 10 patents. He joined the editorial board of Chin. J. Catal. in 2020.
Supported by:
摘要:
贵金属广泛用于多相催化研究, 对于诸多具有重要科学意义和工业应用价值的化学反应展现出优异的催化活性和选择性. 引入轻合金元素(如C, H, B和N), 可以调控贵金属的晶体结构和电子性质, 是进一步提高贵金属催化性能的重要策略. 与传统的金属合金催化剂相比, 这种轻元素合金化的催化剂具有一些独特性: (1)轻元素由于原子尺寸很小, 容易溶于金属晶格的间隙位点; (2)一些轻元素(如C, N和S)的电负性与金属的差别很大, 能够在相邻原子间引起较大的电荷转移; (3)轻元素-金属合金中的电子相互作用主要由金属的d轨道和轻元素的sp轨道杂化主导, 这与金属合金中的d-d轨道杂化显著不同. 这些独特性为贵金属原子结构和电子结构的调控以及催化性能的优化带来了更多的可能性. 轻合金元素研究的主要瓶颈在于其原子尺寸小、分布不均匀、难以直接观察和精准控制, 从而限制了对活性提升机制和构效关系的研究. 近几十年来, 纳米合成技术和材料表征技术的长足发展使得轻合金元素改性的催化剂研究渐入佳境. 此外, 计算化学在结构分析和催化应用中的日趋成熟为揭示轻合金元素对贵金属晶体结构、电子结构和催化性质的调控作用提供了有力工具.
本文综述了引入轻合金元素改性的贵金属催化剂在不同催化应用中的主要研究进展, 总结了贵金属催化性能的主要影响因素(包括轻合金元素的种类、位置、浓度和有序度等), 阐述了轻合金原子如何影响催化反应性能, 介绍了轻元素的实验引入策略以及揭示轻元素合金效应的实验表征和理论研究方法. 重点讨论了不同轻合金原子改性的贵金属基催化剂在催化反应中的广泛应用, 并试图建立其结构特征与催化性能之间的密切联系. 总的来说, 轻合金原子的活性调控作用主要表现在以下几个方面: (1)晶相转变: 轻元素的引入能够改变金属原子的堆积模式, 产生有利于催化反应的晶相结构; (2)电荷转移: 轻元素和母体金属的电负性差异能够导致电荷重新分布, 影响金属的电子结构; (3)应力效应: 轻元素的引入会导致金属晶格膨胀, 产生拉伸应力, 引起电子结构变化; (4)配体效应: 轻元素的sp轨道和金属的d轨道杂化, 引起d带中心下移, 降低表面吸附性质; (5)集团效应: 轻元素的引入能够孤立金属原子, 产生特定的表面金属位点, 有利于促进催化反应; (6)次表面化学: 在氢相关的催化反应中, 次表面的间隙轻元素能够阻止氢的渗入, 抑制活性衰减或不利的副反应发生.
最后, 本文对于当前该领域存在的挑战和未来的发展前景进行了分析, 以期促进该合金体系的合成、理解和催化应用, 内容包括: (1)开发更精确可控的轻元素掺入策略; (2)合理阐明轻合金元素与宏观催化性能之间的关系; (3)发展新型的轻元素改性催化剂; (4)扩展轻元素改性催化剂的催化应用范围.
陈辉, 张博, 梁宵, 邹晓新. 轻元素调控的贵金属催化剂在能源相关领域的应用[J]. 催化学报, 2022, 43(3): 611-635.
Hui Chen, Bo Zhang, Xiao Liang, Xiaoxin Zou. Light alloying element-regulated noble metal catalysts for energy-related applications[J]. Chinese Journal of Catalysis, 2022, 43(3): 611-635.
Fig. 1. Light elements and noble metal elements contained in this review for the construction of alloy catalysts; r, χ, and EC represent atomic radius, electronegativity, and electronic configuration, respectively.
Fig. 2. Stacking structures of pure Pd with fcc atomic arrangements (a), PdHx alloy comprising a disordered hydrogen distribution in fcc-Pd lattices (b), PdBx alloy comprising a disordered boron distribution in hcp-Pd lattices (c), Pd2B comprising an ordered boron distribution in hcp-Pd lattices (d). Note that fcc represents an a-b-c-a-b-c… stacking pattern, and hcp represents an a-b-a-b-… stacking pattern.
Fig. 3. Summary of the main functions of light alloying elements affecting catalytic activity, including phase transition (a), charge transfer (b), strain effect (c), ligand effect (d), ensemble effect (e), and subsurface chemistry (f).
Fig. 4. (a) Formation energies of RhX (X = B, C, and N), and integrated COHP values of Rh?X and X?X bonding; (b) Crystal structure of RhB; (c) Calculated free-energy diagrams of RhB, hcp-Rh, fcc-Rh, and Pt for HER at equilibrium potential. (a?c) Reproduced with permission [48]. Copyright 2021, Royal Society of Chemistry. (d) Pd d-band center and ΔGH* of Pd-B models in which interstitial B atoms vary from sub-surface to bulk; (e) Volcano plot displaying the ΔGH* values over Pd-B models with different concentrations of subsurface boron as a function of their surface Pd d-band centers; (f) Comparison of electrochemical active surface areas (ECSA) and ECSA-normalized specific activities for Pd2B, Pd, Pt, and two disordered B-doped Pd. (d?f) Reproduced with permission [30]. Copyright 2021, Elsevier.
Fig. 5. Summary of the main strategies for light element incorporation, including in-situ formation during catalysis (a), diffusion from the supports (b), wet chemical reduction (c), and high-temperature solid-state methods (d).
Fig. 6. (a) Schematic of hydrogen and carbon atoms dissolving in Pd catalysts and modifying the selectivity during alkyne hydrogenation. Reproduced with permission [14]. Copyright 2008, American Association for the Advancement of Science. (b) Schematic of boron diffusion from a porous BN support to a palladium subsurface. Reproduced with permission [66]. Copyright 2020, Wiley-VCH. (c) Schematic of the wet chemical synthesis of Pd-H nanostructures and lattice spacing changes from Pd to Pd-H. Reproduced with permission [33]. Copyright 2020, Chinese Chemical Society. (d) Selective synthesis of four phase-pure Ru-B intermetallics through solid state reactions. Reproduced with permission [99]. Copyright 2020, Royal Society of Chemistry.
Fig. 8. (a) Schematic of the octahedral interstices (O sites) and tetrahedral interstices (T sites) in Pd hydride; dDPC (b) and iDPC (c) STEM images of PdHx. Reproduced with permission [67]. Copyright 2020, Wiley-VCH. (d) Schematic of the in situ EELS measurement on (e) a single Pd nanocrystal. (f,g) EEL spectra recorded on the Pd nanocrystal at varying H2 pressures. Reproduced with permission [108]. Copyright 2014, Nature Research.
Fig. 9. Structure (a) and neutron diffraction pattern (b) of PdD0.363 nanoparticles. Reproduced with permission [111]. Copyright 2016, American Chemical Society.
Fig. 10. (a) Schematic of in situ ATR-SEIRAS in conjunction with DEMS, GC, and NMR analysis during Pd-catalyzed CO2RR; (b) Variation of CO coverages on Pd and Pd-B catalysts over potential. Reproduced with permission [32]. Copyright 2008, American Association for the Advancement of Science.
Fig. 11. Schematic of the main catalytic reactions studied using light element-modified noble metal systems (left: electrocatalysis; right: thermocatalysis).
Catalyst | Synthesis method | H source | Structure | Reaction a | Ref. |
---|---|---|---|---|---|
PdH0.4 nanocubes | two-step wet chemical method | DMF | fcc structure | CO2RR | [ |
PdHx nanoparticles | In-situ formation during catalysis | H2 | fcc structure (α+β phase) | CO2RR | [ |
Pd-H icosahedra | eet chemical method | DMF | fcc structure | ORR | [ |
PdH0.7 nanocubes | eet chemical method | DMF | fcc structure (β phase) | ORR | [ |
PdH0.43 nanocrystals | solvothermal method | n-butylamine | fcc structure | FAOR | [ |
PdHx nanocrystals | H absorption under CO/H2 mixture | H2 | fcc structure (β phase) | FAOR | [ |
PdH cubes and octahedra nanocrystals | wet chemical method | DMF | fcc structure (β phase) | FAOR/MOR | [ |
PdH0.43 nanocrystals | wet chemical method | DMF | fcc structure (β phase) | MOR | [ |
PdH0.43 nanoparticles | solvothermal method | n-butylamine | fcc structure | COOR | [ |
Nanoporous PdH0.43 | solvothermal method | DMF | fcc structure | NRR | [ |
PdHx nanoparticles | in situ formation during catalysis | H2 | fcc structure | HER | [ |
RhPdH bimetallene nanosheets | solvothermal method | formaldehyde | fcc structure (β phase) | HER | [ |
RhPd-H nanoparticles | solvothermal method | acetaldehyde | fcc structure | HER | [ |
MoPdH nanosheets | solvothermal method | oleylamine | fcc structure | MOR, EOR, EGOR | [ |
Table 1 List of synthesis, structure, and catalytic application of some representative H-modified noble metal catalysts.
Catalyst | Synthesis method | H source | Structure | Reaction a | Ref. |
---|---|---|---|---|---|
PdH0.4 nanocubes | two-step wet chemical method | DMF | fcc structure | CO2RR | [ |
PdHx nanoparticles | In-situ formation during catalysis | H2 | fcc structure (α+β phase) | CO2RR | [ |
Pd-H icosahedra | eet chemical method | DMF | fcc structure | ORR | [ |
PdH0.7 nanocubes | eet chemical method | DMF | fcc structure (β phase) | ORR | [ |
PdH0.43 nanocrystals | solvothermal method | n-butylamine | fcc structure | FAOR | [ |
PdHx nanocrystals | H absorption under CO/H2 mixture | H2 | fcc structure (β phase) | FAOR | [ |
PdH cubes and octahedra nanocrystals | wet chemical method | DMF | fcc structure (β phase) | FAOR/MOR | [ |
PdH0.43 nanocrystals | wet chemical method | DMF | fcc structure (β phase) | MOR | [ |
PdH0.43 nanoparticles | solvothermal method | n-butylamine | fcc structure | COOR | [ |
Nanoporous PdH0.43 | solvothermal method | DMF | fcc structure | NRR | [ |
PdHx nanoparticles | in situ formation during catalysis | H2 | fcc structure | HER | [ |
RhPdH bimetallene nanosheets | solvothermal method | formaldehyde | fcc structure (β phase) | HER | [ |
RhPd-H nanoparticles | solvothermal method | acetaldehyde | fcc structure | HER | [ |
MoPdH nanosheets | solvothermal method | oleylamine | fcc structure | MOR, EOR, EGOR | [ |
Fig. 12. Schematics of the synthetic route (a) and the proposed NRR pathway (b) for nanoporous PdH0.43. Reproduced with permission [123]. Copyright 2020, Wiley-VCH. (c) XRD and of PdH0.43 nanocrystals; (d) MOR catalytic properties of Pd and PdH0.43 nanocrystals. (b,c) Reproduced with permission [68]. Copyright 2015, American Chemical Society.
Fig. 13. (a) Calculated ΔGH* values at different sites on RhPd (111) and RhPd-H (111) surfaces; (b) Catalytic activity comparison of RhPd-H, RhPd, and reference catalysts. (a,b) Reproduced with permission [137]. Copyright 2019, American Chemical Society. (c) Schematic of the formation energy of 2D RhPd alloy and 2D RhPd alloy hydride; (d) TEM image of RhPd-H bimetallene nanosheets. (c,d) Reproduced with permission [34]. Copyright 2020, American Chemical Society.
Catalyst | Synthesis method | B source | Structure | Reaction | Ref. |
---|---|---|---|---|---|
B-doped Pd nanoparticles | wet chemical reduction | BH3,THF | fcc structure | alkyne hydrogenation | [ |
Porous BN supported Pd | impregnation | BN | fcc structure | alkyne hydrogenation | [ |
Mesoporous Pd2B nanoparticles | wet chemical method | DMAB | hcp and fcc structure | p-nitrophenol reduction | [ |
Pd-B films | electrochemical deposition | DMAB | fcc structure | CO2RR | [ |
B-doped Pd nanoparticles | wet chemical method | Boric acid | fcc structure | formate oxidation | [ |
PdCuB nanoparticles | wet chemical method | DMAB | fcc structure | EOR | [ |
Mesoporous Pd-B nanospheres | wet chemical method | DMAB | fcc structure | EOR | [ |
RuB | metallothermic reduction | MgB2 | Hexagonal structure | HER | [ |
RuB2 | solid-state metathesis | MgB2 | Orthorhombic structure | HER | [ |
RhB | solid-phase reaction | MgB2 | hcp structure | HER | [ |
Pd2B | solid-phase reaction | MgB2 | hcp structure | HER | [ |
Rh-Ni-B nanoparticles | wet chemical method | NaBH4 | fcc structure | hydrous hydrazine decomposition | [ |
B-doped Pd nanoparticles | wet chemical method | NaBH4, DMAB | fcc structure | gormic acid decomposition | [ |
B-doped Pd nanoparticles | wet chemical method | DMAB | fcc structure | ORR | [ |
Table 2 List of structure, synthesis, and catalytic application of some representative B-modified noble metal catalysts.
Catalyst | Synthesis method | B source | Structure | Reaction | Ref. |
---|---|---|---|---|---|
B-doped Pd nanoparticles | wet chemical reduction | BH3,THF | fcc structure | alkyne hydrogenation | [ |
Porous BN supported Pd | impregnation | BN | fcc structure | alkyne hydrogenation | [ |
Mesoporous Pd2B nanoparticles | wet chemical method | DMAB | hcp and fcc structure | p-nitrophenol reduction | [ |
Pd-B films | electrochemical deposition | DMAB | fcc structure | CO2RR | [ |
B-doped Pd nanoparticles | wet chemical method | Boric acid | fcc structure | formate oxidation | [ |
PdCuB nanoparticles | wet chemical method | DMAB | fcc structure | EOR | [ |
Mesoporous Pd-B nanospheres | wet chemical method | DMAB | fcc structure | EOR | [ |
RuB | metallothermic reduction | MgB2 | Hexagonal structure | HER | [ |
RuB2 | solid-state metathesis | MgB2 | Orthorhombic structure | HER | [ |
RhB | solid-phase reaction | MgB2 | hcp structure | HER | [ |
Pd2B | solid-phase reaction | MgB2 | hcp structure | HER | [ |
Rh-Ni-B nanoparticles | wet chemical method | NaBH4 | fcc structure | hydrous hydrazine decomposition | [ |
B-doped Pd nanoparticles | wet chemical method | NaBH4, DMAB | fcc structure | gormic acid decomposition | [ |
B-doped Pd nanoparticles | wet chemical method | DMAB | fcc structure | ORR | [ |
Fig. 14. (a) Schematic of the synthesis; (b) TEM image of mesoporous Pd-B alloy nanospheres. (a,b) Reproduced with permission [147]. Copyright 2019, Royal Society of Chemistry. SEM (c), TEM and high-resolution TEM (d) of images of hcp-mesoPd2B. (c,d) Reproduced with permission [49]. Copyright 2020, American Chemical Society.
Fig. 15. (a) Schematic of the effect of metal-boron orbital interaction on hydrogen adsorption for metal-boron intermetallics; (b) A volcano plot exhibiting the exchange current densities as a function of ΔGH* values for different HER catalysts. (a,b) Reproduced with permission [53]. Copyright 2020, Wiley-VCH. (c) Crystal structures of RuB2; (d) Fitted linear relationship between the ΔGH* values and the metal d-band center for MB2, Pt, and Ru; (e) HER polarization curves for RuB2 and Pt/C in alkaline electrolyte. (c?e) Reproduced with permission [98]. Copyright 2019, Wiley-VCH.
Fig. 16. SEM (a) and TEM (d) images of C-Au catalysts supported on ordered mesoporous carbon; (c) Energy profiles for H2 dissociation at Au and C-Au surfaces. (a?c) Reproduced with permission [80]. Copyright 2020, Nature Research. Bright-field (BF)-STEM (d) and ABF-STEM (e) images of Rh2C. The inset of (e) shows the structural model of Rh2C. (f) ΔGH* values for HER of Rh2C, Rh, and Pd, respectively. (d?f) Reproduced with permission [81]. Copyright 2020, American Chemical Society.
Fig. 17. (a) Schematics of structural-dependent selectivity for NH3 catalytic oxidation over supported Pd nanoparticles. The Pd, N, H, and O atoms are in green, blue, white and red, respectively. (b) In situ Pd L3-edge XANES spectra of supported Pd catalysts in different gas environments. (c) Catalytic behavior of supported Pd catalysts for NH3 oxidation at increasing temperatures. Reproduced with permission [15]. Copyright 2019, Nature Publishing Group.
Fig. 18. (a) Schematic of the synthesis of Pd3S; (b) Structural resemblance of Pd3S (left) and Pd4S (right) surfaces; (c) Catalytic activity for alkyne semi-hydrogenation as a function of the differential adsorption energy of acetylene and ethene for Pd3S, Pd4S, and reference catalysts. (a?c) Reproduced with permission [54]. Copyright 2018, Nature Publishing Group. (d) TEM image of AgP2 nanocrystals; (e) Schematic of the selective CO2-to-syngas reaction on AgP2. (d,e) Reproduced with permission [50]. Copyright 2019, Nature Publishing Group.
Fig. 19. (a) Schematic of the interstitial Si incorporation strategy for promoting Ru top site from subordinate to dominant status; (b) HER polarization curves of RuSi, Ru, Pt, and Si in acidic electrolyte. Reproduced with permission [55]. Copyright 2019, Wiley-VCH. (c) Proposed catalytic activation pathway for ammonia synthesis over LaRuSi; (d) Catalytic performances for ammonia synthesis over LaRuSi, CaRuSi, and LaRu2Si2. Reproduced with permission [94]. Copyright 2019, Wiley-VCH.
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