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

doi:10.16085/j.issn.1000-6613.2017.02.023

Chemical Industry and Engineering Progree ›› 2017, Vol. 36 ›› Issue (02): 568-572.DOI: 10.16085/j.issn.1000-6613.2017.02.023

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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

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

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

安徽工程大学生物与化学工程学院, 安徽芜湖 241000

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。

Abstract

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 O_ads/O_latt 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 O_ads/O_latt. 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

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O_ads/O_latt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O_ads/O_latt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

CLC Number:

TQ426

REN Chao, ZHANG Zhihua, LU Xiaojia, TANG Dingxing, YANG Renchun. The construction of three-dimensionally ordered macroporous (Ag,Au,Pd)/LaMnO₃ via nitric acid-aided method and their catalytic combustion properties[J]. Chemical Industry and Engineering Progree, 2017, 36(02): 568-572.

任超, 张志华, 卢小佳, 唐定兴, 杨仁春. 硝酸辅助三维有序大孔(Ag,Au,Pd)/LaMnO₃制备及其催化性能[J]. 化工进展, 2017, 36(02): 568-572.

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

硝酸辅助三维有序大孔(Ag,Au,Pd)/LaMnO₃制备及其催化性能

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