固相浸渍法制备NiO/CeO2催化剂及其在CO氧化反应中的应用

doi:10.3866/PKU.WHXB201309041

物理化学学报 >> 2013, Vol. 29 >> Issue (11): 2451-2458.doi: 10.3866/PKU.WHXB201309041

固相浸渍法制备NiO/CeO₂催化剂及其在CO氧化反应中的应用

孙敬方¹, 葛成艳¹, 姚小江¹, 曹原¹, 张雷¹, 汤常金¹, 董林^1,2

1 南京大学化学化工学院, 介观化学教育部重点实验室, 南京 210093;
2 南京大学现代分析中心, 江苏省机动车尾气污染控制重点实验室, 南京 210093

收稿日期:2013-05-13 修回日期:2013-09-04 发布日期:2013-10-30
通讯作者: 汤常金, 董林 E-mail:tangcj@nju.edu.cn;donglin@nju.edu.cn
基金资助:
国家自然科学基金项目(21273110);江苏省科技工业支撑计划(BE2011167);厦门大学固体表面物理化学国家重点实验室开放课题(201207)资助

Preparation of NiO/CeO₂ Catalysts by Solid State Impregnation and Their Application in CO Oxidation

SUN Jing-Fang¹, GE Cheng-Yan¹, YAO Xiao-Jiang¹, CAO Yuan¹, ZHANG Lei¹, TANG Chang-Jin¹, DONG Lin^1,2

1 Key Laboratory of Mesoscopic Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China;
2 Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Nanjing University, Nanjing 210093, P. R. China

Received:2013-05-13 Revised:2013-09-04 Published:2013-10-30
Contact: TANG Chang-Jin, DONG Lin E-mail:tangcj@nju.edu.cn;donglin@nju.edu.cn
Supported by:
The project was supported by the National Natural Science Foundation of China (21273110), Jiangsu Province Science and Technology Support Program, China (Industrial, BE2011167), and Opening Project Program of the State Key Laboratory of Physical Chemistry of Solid Surfaces (Xiamen University), China (201207).

摘要/Abstract

摘要：

采用固相浸渍法制备了一系列NiO/CeO₂催化剂,并通过与常规湿浸渍法比较,考察了制备方法对催化剂和CO氧化反应性能的影响.同时结合X射线衍射(XRD),N₂吸附-脱附(BET),透射电镜(TEM),氢气-程序升温还原(H₂-TPR),拉曼(Raman)光谱,X射线光电子能谱(XPS)等手段对催化剂的结构和表面物种分散状态进行了表征.CO氧化活性测试结果表明,当镍负载量相同时,固相浸渍法制备的催化剂相比于湿浸渍法表现出更好的催化性能.TEM、XPS、H₂-TPR结果表明,固相浸渍法更有利于加强镍铈间的相互作用和得到高分散的镍物种,从而促进镍物种的还原.Raman结果表明固相浸渍法相比于湿浸渍法能产生更多氧空位,这有利于氧气在催化剂表面的活化,使得CO氧化反应更容易进行.

关键词: NiO/CeO₂, CO氧化, 固相浸渍法, 湿浸渍法, 界面相互作用

Abstract:

NiO/CeO₂ catalysts with different NiO loadings were prepared by a novel solid state impregnation method. The physical and chemical properties of these catalysts were compared with those of catalysts prepared by traditional wet impregnation method. The catalysts were tested for low temperature catalytic CO oxidation and characterized by X-ray diffraction (XRD), N₂ physical adsorption, transmission electron microscopy (TEM), H₂ temperature-programmed reduction (H₂-TPR), Raman spectrum, and X-ray photoelectron spectroscopy (XPS). CO oxidation results showed that nickel-ceria catalysts were good candidates for low temperature CO oxidation, with complete oxidation achieved at temperatures below 200 ℃. The activity of the catalysts increased with nickel loading, and those prepared using the solid state impregnation method displayed higher activities than those prepared by wet impregnation method at the same nickel loading. TEM, XPS, and H₂-TPRresults showed that solid state impregnation increased the dispersion of the nickel species on the surface of catalysts and strengthened the interactions between nickel and cerium, which benefited the reduction of nickel species. Raman results showed that the 0001 concentration of oxygen vacancies in the catalysts could be increased using the solid state impregnation method, likely because of more doped nickel ions in the ceria lattice, which promote the activation of oxygen molecules to facilitate the CO oxidation.

Key words: NiO/CeO₂, CO oxidation, Solid state impregnation, Wet impregnation, Interfacial interaction

孙敬方, 葛成艳, 姚小江, 曹原, 张雷, 汤常金, 董林. 固相浸渍法制备NiO/CeO₂催化剂及其在CO氧化反应中的应用[J]. 物理化学学报, 2013, 29(11): 2451-2458.

SUN Jing-Fang, GE Cheng-Yan, YAO Xiao-Jiang, CAO Yuan, ZHANG Lei, TANG Chang-Jin, DONG Lin. Preparation of NiO/CeO₂ Catalysts by Solid State Impregnation and Their Application in CO Oxidation[J]. Acta Phys. -Chim. Sin., 2013, 29(11): 2451-2458.

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201309041

https://www.whxb.pku.edu.cn/CN/Y2013/V29/I11/2451

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固相浸渍法制备NiO/CeO₂催化剂及其在CO氧化反应中的应用

Preparation of NiO/CeO₂ Catalysts by Solid State Impregnation and Their Application in CO Oxidation

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