Catalysis on Singly Dispersed Rh Atoms Anchored on an Inert Support
| Autor: | Yuanyuan Li, Tian Wei Goh, Tong Zhu, Ya-Fan Zhao, Zili Wu, Franklin Feng Tao, Jimmy Jingyue Liu, Shiran Zhang, Luan Nguyen, Anatoly I. Frenkel, Jun Li, Yan Tang, Wenyu Huang |
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| Rok vydání: | 2017 |
| Předmět: |
Oxide
Nanoparticle chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Catalysis 0104 chemical sciences Rhodium Metal chemistry.chemical_compound chemistry Catalytic cycle visual_art visual_art.visual_art_medium Molecule 0210 nano-technology Carbon monoxide |
| Zdroj: | ACS Catalysis. 8:110-121 |
| ISSN: | 2155-5435 |
| Popis: | A metal catalyst supported on an inert substrate could consist of both metal nanoparticles and singly dispersed metal atoms. Whether these singly dispersed metal atoms are active and how different their catalytic mechanism could be in contrast to a supported metal catalyst are fundamentally important for understanding catalysis on a supported metal or oxide. By taking reduction of NO with CO on singly dispersed Rh atoms anchored on an inert support SiO2 as a probe system (Rh1/SiO2), here we demonstrated how singly dispersed metal atoms on an inert support could perform a complex multi-step catalytic cycle through a mechanism distinctly different from that for a supported metal nanoparticle with continuously packed metal sites. These singly dispersed Rh1 atoms anchored on SiO2 are active in reducing nitric oxide with carbon monoxide through two reaction pathways that are different from those of Rh nanoparticles. In situ IR studies show that a CO molecule and a NO molecule coadsorb on a singly dispersed Rh ... |
| Databáze: | OpenAIRE |
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