整装式铝泡沫负载Pd催化剂Pd/AlOOH/Al-foam及其催化甲烷燃烧性能  

Monolithic Al-foam supported Pd catalyst Pd/AlOOH/Al-foam for catalytic combustion of methane

作　　者：朱春山[1] 李金风 张巧飞 Zhu Chunshan;Li Jinfeng;Zhang Qiaofei(College of Chemistry and Chemical Engineering,Henan University of Technology,Zhengzhou 450001,Henan,China)

机构地区：[1]河南工业大学化学化工学院,河南郑州450001

出　　处：《工业催化》2021年第1期28-37,共10页Industrial Catalysis

基　　金：国家自然科学基金青年基金(21707028);河南省重点研发与推广专项项目(202102310233);河南工业大学高层次人才科研基金项目(2016BS017)。

摘　　要：以三维网络结构的铝泡沫板作为骨架基体和铝源,利用水热氧化法制备整装式拟薄水铝石(AlOOH/Al-foam)纳米阵列,随后通过丙酮辅助-初湿浸渍法,制备出整装式铝泡沫负载Pd催化剂Pd/AlOOH/Al-foam,用于低浓度甲烷催化燃烧反应。在制备条件优化过程中,发现催化剂性能受到纳米阵列的形貌特征、物相组成以及焙烧温度等因素的影响。其中,表面富含羟基的拟薄水铝石可促进Pd颗粒的均匀分散,也增强载体和Pd之间的相互作用,进而提高甲烷燃烧的低温活性。稳定性测试初期活性下降较快,主要原因是表层Al_(2)O_(3)纳米阵列载体和Pd纳米颗粒自身的不稳定性导致的Pd颗粒烧结。Microfibrous structured Pd/AlOOH/Al-foam catalysts to be used for catalytic combustion of low concentration methane were developed with the aid of a facile hydrothermal surface oxidation of thin-sheet Al-foam followed by solvent-assisted incipient wetness impregnation of Pd nanoparticles(NPs).During the optimization of preparation conditions,we found that the performance of Pd/AlOOH/Al-foam depends on the surface morphology of AlOOH nanoarrays,phase composition of the nanoarrays support,and calcination temperature.Particularly,the hydroxyl-rich surface of AlOOH is inclined to induce well-dispersed Pd NPs and strong Pd-support interaction over the Pd/AlOOH-100 catalyst,thereby offering high low-temp-erature activity for methane combustion.Methane conversion declined rapidly at the early stage of the stability test,which was attributed to the sintering of Pd NPs resulted from the instability of surface alumina nanoarrays and Pd NPs.

关 键 词：催化剂工程 铝泡沫 水热氧化 Pd整装式催化剂 催化燃烧 甲烷 

分 类 号：TQ426.6[化学工程] X701[环境科学与工程—环境工程]