Nonoxidative Coupling of Methane over Supported Ceria Photocatalysts
Nonoxidative Coupling of Methane over Supported Ceria Photocatalysts
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DOI：
10.1021/jp712029w
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发表时间：
2008-04
影响因子：
3.7
通讯作者：
L. Yuliati;T. Hamajima;T. Hattori;H. Yoshida
中科院分区：
文献类型：
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作者：
L. Yuliati;T. Hamajima;T. Hattori;H. Yoshida
研究了各种二氧化硅负载的稀土氧化物在室温下的光催化甲烷转化情况。其中，低负载量的二氧化硅负载氧化铈在甲烷非氧化偶联（NOCM）生产乙烷和氢气方面表现出最高的光活性。二氧化硅负载氧化铈的 XANES、DR UV-vis 和磷光光谱表明，低负载样品上的主要物质是高度分散的 Ce(III) 氧化物，表明它们是反应的光催化活性位点。高度分散的 Ce(III) 氧化物也可以在氧化铝上形成，这增强了氧化铝对 NOCM 的光活性。
Various silica-supported rare earth oxides were examined for photocatalytic methane conversion around room temperature. Among them, silica-supported cerium oxide with low loading amount showed the highest photoactivity for nonoxidative coupling of methane (NOCM) to produce both ethane and hydrogen. XANES, DR UV−vis, and phosphorescence spectra of silica-supported cerium oxide revealed that the main species on the low loading samples were highly dispersed Ce(III) oxides, suggesting that they were the photocatalytic active sites for the reaction. The highly dispersed Ce(III) oxides could be formed also on alumina, which enhanced the photoactivity of alumina for the NOCM.