Understanding the involvement of supports in the catalysis of atomically dispersed metal catalysts

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2018,（11）
• 页码范围: 669-671
• 页数: 3页
• 语种: 英文

摘要

Supported metal nanoparticles are widely used as heterogeneous catalysts in chemical,food,energy and environmental industry.Due to the high surface energy of metal nanoparticles,the supports are highly important to stabilize the metal nanoparticles and protect them from sintering during catalytic reactions.In many cases,the interfaces formed between the metal components and supports also determine the catalytic performances of supported metal nanoparticles [1,2],which is often referred to as "support effect" and has been observed in numerous catalyst systems.For instance,the Au-TiOx interface accelerates the water-gas shift reaction and CO oxidation [2].The Pt-FeOx and Pt-Fe(OH)x interfaces exhibit excellent performance in the CO oxidation [3].The Au-CeOx interface enhances the electrocatalytic reduction of CO2 [4].However,the catalytically active centers of supported metal catalysts prepared through conventional methods,i.e.,impregnation,co-deposition,deposition-precipitation,are usually highly diverse and complicated in both atomic and electronic structures [5].Due to the lack of effective tools for resolving the local atomic structure of metal-support interfaces,it is extremely challenging to understand how the metal-support interfaces control the catalysis of supported metal catalysts at the molecular level.