Atmospheric-Pressure Cold Plasma Activating Au/P25 for CO Oxidation: Effect of Working Gas.
Atmospheric-Pressure Cold Plasma Activating Au/P25 for CO Oxidation: Effect of Working Gas.
复制标题
大气压冷等离子体激活 Au/P25 进行 CO 氧化：工作气体的影响
DOI：
10.3390/nano8090742
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发表时间：
2018-09-19
期刊：
影响因子：
--
通讯作者：
Zhang X
中科院分区：
文献类型：
--
作者：
Zhang J;Di L;Yu F;Duan D;Zhang X
商业TiO 2（P25）负载金（Au/P25）的研究越来越受到人们的关注。本文采用常压冷等离子体对浸渍法制备的Au/P25-As催化剂进行了活化。研究了低温等离子体工作气体（氧气、氩气、氢气和空气）对Au/P25催化剂结构和性能的影响。采用X射线衍射（XRD）、紫外-可见漫反射光谱（DRS）、透射电子显微镜（TEM）和X射线光电子能谱（XPS）对Au/P25催化剂进行了表征。CO氧化被用作模型反应探针来测试Au/P25催化剂。XRD结果表明，负载金和AP冷等离子体活化对P25载体的影响不大。CO在Au/P25催化剂上的氧化活性顺序为：Au/P25-O2 P> Au/P25-As > Au/P25-阿普> Au/P25-H2 P> Au/P25-AirP。Au/P25-AirP催化剂的CO氧化活性最差，这可能是由于Au纳米颗粒尺寸较大、活性[O]s浓度较低以及[NOx]s中毒所致。Au/P25-阿普和Au/P25-H2 P催化剂的催化性能较差是由于[O]s物种浓度较低。Au/P25-O2 P催化剂的100%CO转化温度为40 °C，比所制备的Au/P25-As催化剂的100%CO转化温度低30 °C。Au/P25-O2 P催化剂的CO氧化活性主要归因于金前驱体的有效分解、金纳米颗粒的小尺寸和高浓度的[O]s物种。
Commercial TiO2 (P25) supported gold (Au/P25) attracts increasing attention. In this work, atmospheric-pressure (AP) cold plasma was employed to activate the Au/P25-As catalyst prepared by a modified impregnation method. The influence of cold plasma working gas (oxygen, argon, hydrogen, and air) on the structure and performance of the obtained Au/P25 catalysts was investigated. X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM), and X-ray spectroscopy (XPS) were adopted to characterize the Au/P25 catalysts. CO oxidation was used as model reaction probe to test the Au/P25 catalyst. XRD results reveal that supporting gold and AP cold plasma activation have little effect on the P25 support. CO oxidation activity over the Au/P25 catalysts follows the order: Au/P25-O2P > Au/P25-As > Au/P25-ArP ≈ Au/P25-H2P > Au/P25-AirP. Au/P25-AirP presents the poorest CO oxidation catalytic activity among the Au/P25 catalysts, which may be ascribed to the larger size of gold nanoparticles, low concentration of active [O]s, as well as the poisoning [NOx]s. The poor catalytic performance of Au/P25-ArP and Au/P25-H2P is ascribed to the lower concentration of [O]s species. 100% CO conversion temperatures for Au/P25-O2P is 40 °C, which is 30 °C lower than that over the as-prepared Au/P25-As catalyst. The excellent CO oxidation activity over Au/P25-O2P is mainly attributed to the efficient decomposition of gold precursor species, small size of gold nanoparticles, and the high concentration of [O]s species.
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