Conversion of syngas to methanol and DME on highly selective Pd/ZnAl_(2)O_(4) catalyst

作     者：Liang Liu Zenan Lin Shanya Lin Yeyun Chen Lina Zhang Shaopeng Chen Xianhua Zhang Jingdong Lin Zhaoxia Zhang Shaolong Wan Yong Wang Liang Liu;Zenan Lin;Shanya Lin;Yeyun Chen;Lina Zhang;Shaopeng Chen;Xianhua Zhang;Jingdong Lin;Zhaoxia Zhang;Shaolong Wan;Yong Wang

作者机构：College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-EstersXiamen UniversityXiamen 361005FujianChina Voiland School of Chemical Engineering and BioengineeringWashington State UniversityPullmanWA99164United States 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2021年第30卷第7期

页      面：564-572页

核心收录：

学科分类：081702[工学-化学工艺] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the Major Research Plan of National Natural Science Foundation of China(No.91545114 and No.91545203) the National Natural Science Foundation of China(No.21576227) 

主　　题：Pd/ZnAl_(2)O_(4) Syngas Methanol Dimethyl ether 

摘      要：Supported Pd catalysts with varied Pd loadings(x=0.5 wt%, 2.0 wt%, 5.0 wt%, 7.5 wt%, 15.0 wt%) were prepared by the incipient wetness impregnation method using a ZnAl_(2)O_(4) spinel *** found that ZnAl_(2)O_(4) supported Pd catalysts with low Pd loadings(e.g., 0.5 wt%) are very selective in syngas conversion to methanol and dimethyl-ether(DME).XRD and TEM characterization shows that,after reduction at350℃,PdZnβ phase with Pd:Zn molar ratio of 1:1 is favored to form predominantly on the spinel support at relatively low Pd loadings,*** than 5.0 wt%, while Pd-rich PdZnα alloy phase exists at Pd loadings above 5.0 wt%.A higher reduction temperature such as 500℃ can facilitate the transformation from PdZnα to PdZnβ phase in those catalysts with high Pd *** further found that catalysts with predominant PdZnβ phase are selective in the methanol and DME production from syngas,while the presence of PdZnα phase leads to the notable formation of alkanes byproducts,resulting in reduced methanol and DME *** formation from dehydration of methanol depends on the acidity of catalysts,which was found to increase with Pd loading,probably due to the formation of isolated Al_(2)O_(3) as a result of Zn migrating from ZnAl_(2)O_(4) spinel phase to form the PdZn phases with Pd.