High-performance microstructured Au-Ag bimetallic catalyst for oxidative coupling of methanol to methyl formate

High-performance microstructured Au-Ag bimetallic catalyst for oxidative coupling of methanol to methyl formate
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用于甲醇氧化偶联制甲酸甲酯的高性能微结构Au-Ag双金属催化剂

DOI:
10.1016/j.catcom.2019.105741
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发表时间:
2019-09
影响因子:
3.7
通讯作者:
Liu Jiawen
Liu Jiawen
中科院分区:
化学3区
文献类型:
--
作者:
Zhang Qiaofei;Zhu Chunshan;Yang Ganghua;Sun Yige;Wang Dongsheng;Liu Jiawen

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通过在铝纤维网络上逐步电镀金和银而制备的微纤维结构 1Au-xAg/铝纤维(x=0.2、0.4 和 0.6wt%)催化剂已测试用于甲醇与甲酸甲酯的氧化偶联。在这些催化剂中,1Au-0.2Ag/Al-纤维本质上具有高活性、选择性和良好的稳定性,因为Ag金属相分散良好,有利于活性氧的利用。 Ag负载量的增加导致表面Au的屏蔽,有利于甲醇的吸附,从而恶化甲醇转化率。
Microfibrous-structured 1Au-xAg/Al-fiber (x = 0.2, 0.4 and 0.6 wt%) catalysts prepared by galvanic stepwise deposition of Au and Ag onto Al-fiber network have been tested for the oxidative coupling of methanol to methyl formate. Among these catalysts, 1Au-0.2Ag/Al-fiber provided high activity, selectivity and good stability, by nature, due to the well-dispersed Ag metal phase to facilitate the availability of reactive oxygen species. The increase of Ag loading led to the screening of surface Au which favours the adsorption of methanol, thus deteriorating methanol conversion.
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