Intrinsic kinetics of one-step dimethyl ether synthesis from hydrogen-rich synthesis gas over bi-functional catalyst

The increasing demand for producing dimethyl ether from synthesis gas explains the renewed interest in studying the activity and stability of catalysts. In the present work, resource catalytic testing of ZSM-5 zeolites was carried out in the one-step synthesis of dimethyl ether from synthesis gas for 120 hours. Formation of condensation products was observed on zeolite surface after catalytic tests which leads to lower catalytic activity of samples. Condensation products were investigated by thermal analysis in an oxidizing atmosphere. Textural characteristics of zeolites before and after reaction were investigated. It was shown that methanol significantly contribute to formation of condensation products on the catalyst surface in the process of dimethyl ether production.

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STUDY OF KINETICS OF LIQUID PHASE DIMETHYL ETHER SYNTHESIS FROM SYNTHESIS GAS

Petroleum Science and Technology ◽

10.1080/10916469808949798 ◽

1998 ◽

Vol 16 (5-6) ◽

pp. 555-566 ◽

Cited By ~ 2

Author(s):

Guo Junwang ◽

Niu Yuqin ◽

Zhang Bijiang

Keyword(s):

Liquid Phase ◽

Dimethyl Ether ◽

Synthesis Gas ◽

Dimethyl Ether Synthesis ◽

Ether Synthesis ◽

Kinetics Of

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Intrinsic Kinetics Study of Dimethyl Ether Synthesis from Methanol on γ-Al2O3Catalysts

Industrial & Engineering Chemistry Research ◽

10.1021/ie8011984 ◽

2008 ◽

Vol 47 (18) ◽

pp. 7130-7130 ◽

Cited By ~ 2

Author(s):

Majid Mollavali ◽

Fereydoon Yaripour ◽

Hossein Atashi ◽

Saeed Sahebdelfar

Keyword(s):

Dimethyl Ether ◽

Kinetics Study ◽

Intrinsic Kinetics ◽

Dimethyl Ether Synthesis ◽

Ether Synthesis

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Study on Preparation and Catalytic Properties of Pd/γ-Al2O3 Catalysts in One-Step Synthesis of Dimethyl Ether

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.66-68.1404 ◽

2011 ◽

Vol 66-68 ◽

pp. 1404-1409 ◽

Cited By ~ 4

Author(s):

Rui Zhi Chu ◽

Zhong Cai Zhang ◽

Ya Fei Liu ◽

Xian Liang Meng ◽

Zhi Min Zong ◽

...

Keyword(s):

Dimethyl Ether ◽

Catalytic Performance ◽

Acid Sites ◽

Co Conversion ◽

Dimethyl Ether Synthesis ◽

Acidic Sites ◽

One Step ◽

Space Time Yield ◽

Ether Synthesis ◽

Synthesis Of Dimethyl Ether

A series of Pd/γ-Al2O3 catalysts with different additons of Pd were prepared by impregnation. The effect of calcination condition and Pd loading on catalytic performance of catalysts for one-step dimethyl ether synthesis has been investigated. The physic-chemical performance and structure of Pd/γ-Al2O3 catalysts were characterized by CO-TPD, TGA and nitrogen physisorption. The results show that the dispersion of Pd and the amount of adsorbration on the CO-bridge of Pd could be increased to by the moderate microwave heating on the catalysts, and the catalyst performance can be improved. But a large number of surface acidic sites of Pd/γ-Al2O3 are covered by highly fragmented Pd-grain, it causes DME selectivity reduced. And the excessive Pd can reduce the samples’ surface acid, decrease the dispersion of the metal Pd and block up the pore of γ-Al2O3. The CO conversion rate and DME space-time yield could reach 60.1% and 28.76 mmol·g-1·h-1 respectively at 2% Pd loading, at this time Pd/γ-Al2O3 has a high Pd activity surface and ideal acid sites.

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