文献类型：期刊文献

英文题名：Ta2O5 modified γ-Al2O3 as a methanol dehydration component in the single-step synthesis of dimethyl ether from syngas

作者：Wang, Yunfeng[1];Liu, Hongwei[2];Zhang, Haitao[1];Ying, Weiyong[1]

机构：[1]East China Univ Sci & Technol, Engn Res Ctr Large Scale Reactor Engn & Technol, State Key Lab Chem Engn, Minist Educ, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Pharm, Shanghai 200237, Peoples R China

年份：2016

卷号：119

期号：2

起止页码：585

外文期刊名：REACTION KINETICS MECHANISMS AND CATALYSIS

收录：;EI(收录号：20163402734582);WOS:【SCI-EXPANDED(收录号:WOS:000388189000016)】；

基金：The aurthors appropriate the financial support from the National Science and Technology Supporting Plan (No. 2007BAA08B04).

语种：英文

外文关键词：Syngas; Dimethyl ether; gamma-Al2O3; Ta2O5

摘要：Ta2O5 modified gamma-Al2O3 samples were prepared by impregnating with tantalum ethoxide, and mixed with methanol synthesis component (Cu/Zn/Al2O3) to form the bi-functional catalysts. They were applied in one step process of dimethyl ether synthesis from syngas. The characterization method of XRD, N-2 adsorption, FTIR of adsorbed pyridine, H-2-TPR and NH3-TPD and catalyst test were used to measure the impact of Ta2O5 on gamma-Al2O3 and bi-functional catalysts. The results revealed that on Ta2O5 modified gamma-Al2O3 samples, total number of acid sites increased because of appearance of medium acid sites, which contributed to the dimethyl ether formation and helped enhance the CO conversion. The weak acid strength shifted to weaker leading to a lower initial activation temperature of catalysts, which brought out a higher increment of dimethyl ether selectivity at relatively low temperature (230 A degrees C). 6 wt% Ta2O5 modification was enough to obtain high selectivity and conversion of DME synthesis from syngas.