Multifunctional oxygen vacancies in WO3–x for catalytic alkylation of C–H by alcohols under red-light
Multifunctional oxygen vacancies in WO3–x for catalytic alkylation of C–H by alcohols under red-light
复制标题
WO3-x中的多功能氧空位在红光下催化醇对C-H的烷基化
DOI：
10.1016/j.jcat.2021.08.040
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发表时间：
2021
影响因子：
7.3
通讯作者：
Zheng Zhanfeng
中科院分区：
文献类型：
--
作者：
Zhu Pengqi;Sun Xichen;Wang Yunwei;Zhang Jin;Gu Xianmo;Zheng Zhanfeng
光催化剂的表面反应动力学和光吸收特性是有效地将太阳能转化为化学能的基本要求。本研究首次将等离子体WO_3-x用于红光照射下芳烃的光催化烷基化反应。WO_3-x表面和体相中的氧空位允许大量的自由电子增加载流子密度，并使用低能光子支持其LSPR。表面氧空位具有更多的功能：它们不仅释放表面的钨中心，通过配位能力确保醇的化学吸附，而且通过有效地将邻近氧中心上的空穴传输到化学吸附的醇物种来促进醇的活化。总之，体氧空位提供了丰富的电荷，表面空位促进了C-H的键吸附和活化能力，保证了C-H光催化烷基化反应的高效。
Surface reaction kinetics and light absorption properties of a photocatalyst are essential demands for efficiently solar to chemical energy converting. In this study, plasmonic WO3–xwas firstly applied to photocatalytic alkylation of arenes under red light irradiation. The oxygen vacancies, both on the surface and in the bulk of WO3–x, allow abundant free electrons to increase carrier densities and support its LSPR using low energy photons. The surface oxygen vacancies have more functions: they not only release surface tungsten sites which ensure the chemisorption of alcohols due to the coordianation ability but also promote the activation of alcohols via an efficient transport of the holes on the neighbouring O sites to chemisorption alcohol species. In brief, the bulk oxygen vacancies provide abundant charges and the surface vacancies promote the bond adsorption and activation abilities, which ensure the high efficiency of photocatalytic alkylation of C–H.