Atmospheric-Pressure DBD Cold Plasma for Preparation of High Active Au/P25 Catalysts for Low-Temperature CO Oxidation
Atmospheric-Pressure DBD Cold Plasma for Preparation of High Active Au/P25 Catalysts for Low-Temperature CO Oxidation
复制标题
大气压DBD冷等离子体制备高活性Au/P25低温CO氧化催化剂
DOI：
10.1088/1009-0630/18/5/17
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发表时间：
2016-05-01
影响因子：
1.7
通讯作者：
Xu Weijie
中科院分区：
文献类型：
--
作者：
Di Lanbo;Zhan Zhibin;Xu Weijie
采用常压介质阻挡放电(DBD)产生的冷等离子体，通过沉积-沉淀法制备了工业TiO2Degussa P25负载Au催化剂(Au/P25-P)。考察了等离子体还原时间和焙烧时间对Au/P25-P催化剂性能的影响。通过CO氧化反应考察了Au/P25催化剂的催化活性。结果表明，DBD冷等离子体制备Au/P25-P催化剂是一个快速的过程，Au/P25-P(4min)表现出最高的CO氧化活性，这是由于Au化合物完全还原和氧空位消耗少所致。为了形成更多的氧空位活性物种，对Au/P25-P进行了焙烧，得到了Au/P25-PC催化剂。有趣的是，在Au/P25样品中，Au/P25-PC表现出最高的CO氧化活性。透射电子显微镜结果表明，Au纳米粒子的尺寸较小、分布较广是Au/P25-PC具有高性能的主要原因。常压DBD冷等离子体是制备高性能负载型Au催化剂的有效方法。
Cold plasma generated by dielectric barrier discharge (DBD) at atmospheric pressure was adopted for preparation of commercial TiO2 Degussa P25 supported Au catalysts (Au/P25-P) with the assistance of the deposition-precipitation procedure. The influences of the plasma reduction time and calcination on the performance of the Au/P25-P catalysts were investigated. CO oxidation was performed to investigate the catalytic activity of the Au/P25 catalysts. The results show that DBD cold plasma for the fabrication of Au/P25-P catalysts is a fast process, and Au/P25-P (4 min) exhibited the highest CO oxidation activity due to the complete reduction of Au compounds and less consumption of oxygen vacancies. In order to form more oxygen vacancies active species, Au/P25-P was calcined to obtain Au/P25-PC catalysts. Interestingly, Au/P25-PC exhibited the highest activity for CO oxidation among the Au/P25 samples. The results of transmission electron microscopy (TEM) indicated that the smaller size and high distribution of Au nanoparticles are the mean reasons for a high performance of Au/P25-PC. Atmospheric pressure DBD cold plasma was proved to be of great efficiency in preparing high performance supported Au catalysts.