化工进展 ›› 2017, Vol. 36 ›› Issue (02): 568-572.DOI: 10.16085/j.issn.1000-6613.2017.02.023

• 工业催化 • 上一篇    下一篇

硝酸辅助三维有序大孔(Ag,Au,Pd)/LaMnO3制备及其催化性能

任超, 张志华, 卢小佳, 唐定兴, 杨仁春   

  1. 安徽工程大学生物与化学工程学院, 安徽 芜湖 241000
  • 收稿日期:2016-04-25 修回日期:2016-06-12 出版日期:2017-02-05 发布日期:2017-02-05
  • 通讯作者: 杨仁春,博士,副教授。E-mail:yrclq@163.com。
  • 作者简介:任超(1992-),男,硕士研究生。
  • 基金资助:
    国家自然科学基金(51572004,51202003)、安徽省高校自然科学基金重大项目(KJ2016SD06)、煤气化及能源化工教育部重点实验室开放基金(2016KY11-048)、安徽工程大学校级杰出青年科学基金(2016JQ01)及国家级大学生创新创业训练计划(201510363084,2016103630051)项目。

The construction of three-dimensionally ordered macroporous (Ag,Au,Pd)/LaMnO3 via nitric acid-aided method and their catalytic combustion properties

REN Chao, ZHANG Zhihua, LU Xiaojia, TANG Dingxing, YANG Renchun   

  1. School of Biological and Chemical Engineering, Anhui Polytechnic University, Wuhu 241000, Anhui, China
  • Received:2016-04-25 Revised:2016-06-12 Online:2017-02-05 Published:2017-02-05

摘要: 基于硝酸辅助法成功实现了LaMnO3凝胶速率调控和三维有序大孔结构(3DOM)LaMnO3的构筑;并通过浸渍法实现了(Ag,Au,Pd)/LaMnO3制备。用SEM、XRD、XPS、TPR对所制备的样品形貌、晶型结构、表面组成、还原度进行了分析表征。研究结果显示:相对于未负载的LaMnO3,金属负载的LaMnO3的催化剂具有更高的Oads/Olatt比和更低的还原温度。各催化剂对乙酸乙酯催化氧化性能如下:LaMnO3 < Ag/LaMnO3 < Au/LaMnO3 < Pd/LaMnO3,该关系与其Oads/Olatt比值规律一致;所制备的催化剂在所考察的条件下具有很好的稳定性。该研究表明,硝酸辅助可以实现LaMnO3凝胶速率的调控;金属负载可以调变催化剂的氧空位和催化氧化性能的提高。

关键词: 传质, 胶体, 多相反应, 3DOM结构, LaMnO3, 催化氧化

Abstract: The control of the generation rate of the LaMnO3 gel and the construction of three-dimensionally ordered macroporous(3DOM) LaMnO3 were accomplished via the nitric acid-aided method. Moreover,the (Ag,Au,Pd)/LaMnO3 were also prepared by the impregnation method. The morphology,crystalline,composition and reducibility of the prepared catalysts were characterized by means of FE-SEM,XRD,XPS and TPR,respectively. Compared with the unmodified sample,the metal modified samples presented higher Oads/Olatt and lower reduction temperature. The catalytic properties of the four samples are in the order of:LaMnO3 < Ag/LaMnO3 < Au/LaMnO3 < Pd/LaMnO3,which is consistent with the rule of their Oads/Olatt. Moreover,the resulted catalysts all exhibited excellent stability. The results indicated that the generation rate of the LaMnO3 gel could be effectively modulated by HNO3. More oxygen vacancies were provided on the metal modified samples than on the unmodified sample,which resulted in an enhanced catalytic oxidation activity for ethyl acetate oxidation.

Key words: mass transfer, colloid, multiphase reaction, 3DOM, LaMnO3, catalytic oxidation

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