Au/CaTiO_3催化剂的制备及其对CO氧化反应的催化性能研究
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- 英文论文题名：Preparation and characterization of Au/CaTiO_3 catalysts and its catalytic performance for CO oxidation
- 论文作者：余焕焕 ; 郭九丽 ; 李晶晶 ; 张守民
- 英文论文作者：Yu Huanhuan ; Guo Jiuli ; Li Jingjing ; Zhang Shoumin ; College of Chemistry Nankai University
- 年：2016
- 作者机构：南开大学化学学院;
- 论文关键词：钙钛矿 ; 催化剂 ; 浸渍法 ; CO氧化反应
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十七分会：纳米催化
- 语种：中文
- 分类号：O643.36
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十七分会 ; 纳米催化
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：280k
- 原文格式：D
- 会议级别：全国
摘要
CaTiO_3作为一种重要的钙钛矿类化合物由于其较高的热稳定性和化学稳定性已得到广泛的应用,一氧化碳(CO)催化氧化反应因在实际生活中应用广泛而受到人们普遍关注,如汽车尾气的净化,CO气敏,以及燃料电池中少量CO的消除等。本文以水热法制备纳米片状钙钛矿结构的CaTiO_3,以浸渍法制备一系列的Au/CaTiO_3催化剂,并结合X射线衍射(XRD)、紫外-可见漫反射(Uv-vis)、TEM、X射线光电子能谱(XPS)等手段对所制备的催化剂进行了物相结构表征。TEM图谱表明,纳米Au颗粒均匀的分布在载体表面,且其粒径较小,XPS图谱表明Au以零价态存在于催化剂中。以CO氧化反应为模板反应研究了催化剂的催化性,并对催化剂的稳定性进行了研究。结果表明,所制备的催化剂活性较好,具有较高的稳定性,且在200℃时CO转化率依然为100%,实验所制备的催化剂具有耐高温性。
As a most important perovskite-type oxides CaTiO_3 has received much attention due to its high thermal stability and chemical stability.Catalytic CO oxidation has attracted considerable attention owing to its many applications such as pollution control for vehicle exhausts,CO gas sensors,and fuel cells etc.Nanoflake CaTiO_3 was prepared by solvothermal route.Au/CaTiO_3 catalysts were obtained by impregnation method.The samples were characterized by X-ray diffraction,transmission electron microscopy techniques,X-ray photoelectron spectroscopy,and UV-vis diffuse reflectance spectroscopy.The TEM results exhibited a good dispersion of gold nanoparticles over the support.The XPS spectra revealed that gold was in the metallic state.The catalysis results demonstrated that Au/CaTiO_3 catalysts showed good activity for CO oxidation.Though continuous operated for 10 h,Au/CaTiO_3 catalysts still retained 100% conversion,and there were no deactivation after 50 h at 200℃,suggesting Au/CaTiO_3 catalysts had a long lifetime and high-temperature resistance.
As a most important perovskite-type oxides CaTiO_3 has received much attention due to its high thermal stability and chemical stability.Catalytic CO oxidation has attracted considerable attention owing to its many applications such as pollution control for vehicle exhausts,CO gas sensors,and fuel cells etc.Nanoflake CaTiO_3 was prepared by solvothermal route.Au/CaTiO_3 catalysts were obtained by impregnation method.The samples were characterized by X-ray diffraction,transmission electron microscopy techniques,X-ray photoelectron spectroscopy,and UV-vis diffuse reflectance spectroscopy.The TEM results exhibited a good dispersion of gold nanoparticles over the support.The XPS spectra revealed that gold was in the metallic state.The catalysis results demonstrated that Au/CaTiO_3 catalysts showed good activity for CO oxidation.Though continuous operated for 10 h,Au/CaTiO_3 catalysts still retained 100% conversion,and there were no deactivation after 50 h at 200℃,suggesting Au/CaTiO_3 catalysts had a long lifetime and high-temperature resistance.
引文
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