Active TiO2-Nanostructured Surfaces for CO Oxidation on Rh Model Catalysts at Low-Temperature

Autor:	Salvador Castillo, Rodolfo Zanella, R. Camposeco, Mariana Hinojosa-Reyes, Julio C. López-Curiel, Gustavo A. Fuentes, Isidro Mejía-Centeno
Rok vydání:	2019
Předmět:	Anatase 010405 organic chemistry Inorganic chemistry chemistry.chemical_element Nanoparticle General Chemistry 010402 general chemistry 01 natural sciences Redox Catalysis 0104 chemical sciences Rhodium chemistry.chemical_compound Adsorption chemistry Phase (matter) Organometallic chemistry
Zdroj:	Catalysis Letters. 149:1565-1578
ISSN:	1572-879X 1011-372X
DOI:	10.1007/s10562-019-02757-z
Popis:	We investigated the CO oxidation at low temperature over Rh (1 wt%) supported on TiO2-nanotubes and nanoparticles. We found that tri-titanic acid phase of the nanotubes promotes the interaction between Ti4+ and Rh3+ to reduce Rh3+ to Rh1+ and Rh+1 to Rh0, compared to the anatase phase. In fact, as the Rh0/Ti4+ ratio increases, CO and OH adsorption increases and CO oxidation light-off shifts to lower temperature, from 120 to 60 °C. We found that there is a redox equilibrium between Rh0 + Ti4+ and Rhδ+ + Ti3+ (δ
Databáze:	OpenAIRE
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