Size dependence of photocatalytic oxidation reactions of Rh nanoparticles dispersed on （Ga1-xZnx）（N1-xOx） support

Mixed Ga-Zn oxynitrides were synthesized using coprecipitation, wet‐precipitation, and sol‐id‐solution methods. The oxynitrides were used as supports for Rh nanoparticle catalysts in photo‐catalytic water splitting, CO oxidation, and H2 oxidation. Mixed Ga-Zn oxynitrides produced by wet precipitatio...

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Bibliographic Details
Published in催化学报 Vol. 35; no. 12; pp. 1944 - 1954
Main Author Yi Zhang D. A. J. Michel Ligthart Peng Liu Lu Gao Tiny M. W. G. M. Verhoeven Emiel J. M. Hensen
Format Journal Article
LanguageChinese
Published 2014
Subjects
CO氧化
乙烯基吡咯烷酮
光催化氧化反应
分散
尺寸
氧氮化物
纳米催化剂
纳米粒子
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Summary:Mixed Ga-Zn oxynitrides were synthesized using coprecipitation, wet‐precipitation, and sol‐id‐solution methods. The oxynitrides were used as supports for Rh nanoparticle catalysts in photo‐catalytic water splitting, CO oxidation, and H2 oxidation. Mixed Ga-Zn oxynitrides produced by wet precipitation and nitridation had good visible‐light‐absorption properties and high surface areas, so they were used to support uniformly sized poly（vinylpyrrolidone）‐stabilized Rh nanoparticles. The nanoparticle size range was 2-9 nm. These catalysts had negligible activity in photocatalytic H2 production by water splitting with methanol as a sacrificial agent. Other mixed Ga-Zn oxynitrides were also inactive. A reference sample provided by Domen also showed very low activity. The in‐fluence of particle size on Rh‐catalyzed oxidation of CO and H2 was investigated. For CO oxidation, the activities of small particles were higher for particles with higher Rh oxidation degrees. The op‐posite holds for H2 oxidation.
Bibliography:Oxynitride Rhodium nanoparticle Water splitting Carbon monoxide oxidation Hydrogen oxidation
Mixed Ga-Zn oxynitrides were synthesized using coprecipitation, wet‐precipitation, and sol‐id‐solution methods. The oxynitrides were used as supports for Rh nanoparticle catalysts in photo‐catalytic water splitting, CO oxidation, and H2 oxidation. Mixed Ga-Zn oxynitrides produced by wet precipitation and nitridation had good visible‐light‐absorption properties and high surface areas, so they were used to support uniformly sized poly（vinylpyrrolidone）‐stabilized Rh nanoparticles. The nanoparticle size range was 2-9 nm. These catalysts had negligible activity in photocatalytic H2 production by water splitting with methanol as a sacrificial agent. Other mixed Ga-Zn oxynitrides were also inactive. A reference sample provided by Domen also showed very low activity. The in‐fluence of particle size on Rh‐catalyzed oxidation of CO and H2 was investigated. For CO oxidation, the activities of small particles were higher for part
ISSN:0253-9837
1872-2067