高等学校化学学报 ›› 2014, Vol. 35 ›› Issue (12): 2598.doi: 10.7503/cjcu20140757

• 物理化学 • 上一篇    下一篇

Co3O4表面物种对甲醛氧化催化性能的影响

张叶1, 周佳佳1, 吴贵升1(), 毛东森1, 卢冠忠1,2   

  1. 1. 上海应用技术学院化学与环境工程学院催化研究所, 上海 201418
    2. 华东理工大学化学系工业催化研究所, 上海 200237
  • 收稿日期:2014-08-18 出版日期:2014-12-10 发布日期:2014-11-29
  • 作者简介:联系人简介: 吴贵升, 男, 博士, 教授, 主要从事催化新材料的设计、 合成及应用研究. E-mail:gswu@sit.edu.cn
  • 基金资助:
    上海市教育委员会重点学科建设项目(批准号: J51503)资助

Influence of the Surface Species over Co3O4 on the Formaldehyde Catalytic Oxidation Performance

ZHANG Ye1, ZHOU Jiajia1, WU Guisheng1,*(), MAO Dongsen1, LU Guanzhong1,2   

  1. 1. Research Institute of Applied Catalysis, Academy of Chemical and Environmental Engineering,Shanghai Institute of Technology, Shanghai 201418, China
    2. Institute of Industrial Catalysis, Department of Chemistry, East China University of Science and Technology, Shanghai 200237, China
  • Received:2014-08-18 Online:2014-12-10 Published:2014-11-29
  • Contact: WU Guisheng E-mail:gswu@sit.edu.cn
  • Supported by:
    † Supported by the Shanghai Leading Academic Discipline Project, China(No. J51503).

摘要:

采用沉淀法制备了Co3O4催化剂, 并将催化剂在流动的N2或O2气氛中于不同温度下进行预处理. 通过X射线衍射(XRD)、 热重-差示扫描量热分析(TG-DSC)、 程序升温脱附(O2/CO2-TPD, HCHO-TPSR)和原位漫反射傅里叶变换红外光谱(in situ DRIFTS) 等手段对催化剂表面物种进行了表征. 结果表明, Co3O4-N2-200催化剂表面存在Co3+不饱和配位中心和丰富的弱配位氧负离子, 容易形成双配位的甲酸盐, 并转化成单配位的甲酸盐, 进一步分解为产物.

关键词: 甲醛催化氧化, 四氧化三钴, 甲酸盐, 程序升温脱附, 原位漫反射红外光谱, 表面氧

Abstract:

The Co3O4 catalysts were prepared via precipitation methods, and then were pretreated in N2 or O2 at different temperatures. Based on the study of formaldehyde catalytic oxidation, the catalytic performances were investigated with the detailed surface characterization via temperature programmed desorption(O2/CO2-TPD, HCHO-TPSR), thermogravimetric-differential scanning calorimetry(TG-DSC) and in situ diffuse reflectance infrared fourier transform spectroscopy(in situ DRIFTS). The results presented that Co3O4-N2-200 showed the optimal catalytic performance, because there were rich unsaturated coordination centers of Co3+ and negative oxygen ions with weak bond strength on the surface of Co3O4-N2-200, which was ready to adsorb formaldehyde to form bidentate formate, and then decompose to products via monodentate formate. With increasing pretreatment temperature, the amount of negative oxygen ions decreased, accordingly the catalytic activity for formaldehyde catalytic oxidation decreased due to slow decomposition rate of desorbed bidentate formate.

Key words: Formaldehyde catalytic oxidation, Co3O4, Formate, Temperature programmed desorption, In situ diffuse reflectance infrared Fourier transform spectroscopy, Surface oxygen species

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