Partial Oxidation of Methane to Methanol Using Bismuth-Based Photocatalysts
Partial Oxidation of Methane to Methanol Using Bismuth-Based Photocatalysts
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DOI：
10.1021/cs500821r
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发表时间：
2014-09-01
期刊：
影响因子：
12.9
通讯作者：
Morante, Joan R.
中科院分区：
文献类型：
--
作者：
Murcia-Lopez, Sebastian;Villa, Katherine;Morante, Joan R.
采用水热法合成了铋基光催化剂Bi 2 WO 6、BiVO 4和Bi 2 WO 6/TiO 2-P25，并对其进行了表征和评价。为了更好地理解反应机理，使用了几个条件。所得到的BiVO 4是，其中，最有前途的光催化剂，为该反应，显示出更高的CH 3OH的选择性，比其他更稳定。当Bi 2 WO 6与TiO 2偶联时，甲烷转化率增加;然而，CH 4过氧化为CO2占主导地位。当在光反应器中引入电子清除剂如O-2或Fe 3+时，由于形成高氧化性自由基，观察到类似的效果。
Bismuth-based photocatalysts, Bi2WO6, BiVO4, and coupled Bi2WO6/TiO2-P25, have been synthesized by a facile hydrothermal method, characterized, and evaluated for the first time for the selective photooxidation of methane to methanol. Several conditions were used in order to better comprehend the reaction mechanism. The obtained BiVO4 is, among the others, the most promising photocatalyst for this reaction, displaying higher CH3OH selectivity and being more stable than the others. When Bi2WO6 was coupled with TiO2, the methane conversion increased; however, overoxidation of CH4 to CO2 predominates. A similar effect is observed when electron scavengers such as O-2 or Fe3+ were introduced in the photoreactor as a result of the formation of highly oxidant radicals.