Ta2O5 modified γ-Al2O3 as a methanol dehydration component in the single-step synthesis of dimethyl ether from syngas
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- 作者：Yunfeng Wang ; Hongwei Liu ; Haitao Zhang…
- 关键词：Syngas ; Dimethyl ether ; γ ; Al2O3 ; Ta2O5
- 刊名：Reaction Kinetics, Mechanisms and Catalysis
- 出版年：2016
- 出版时间：December 2016
- 年：2016
- 卷：119
- 期：2
- 页码：585-594
- 全文大小：402 KB
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Catalysis
Industrial Chemistry and Chemical Engineering
Physical Chemistry - 出版者：Akad茅miai Kiad贸, co-published with Springer Science+Business Media B.V., Formerly Kluwer Academic
- ISSN：1878-5204
- 卷排序：119
文摘
Ta2O5 modified γ-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, N2 adsorption, FTIR of adsorbed pyridine, H2-TPR and NH3-TPD and catalyst test were used to measure the impact of Ta2O5 on γ-Al2O3 and bi-functional catalysts. The results revealed that on Ta2O5 modified γ-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 °C). 6 wt% Ta2O5 modification was enough to obtain high selectivity and conversion of DME synthesis from syngas.