Attrition Resistant Catalyst of Direct Dimethyl Ether Synthesis

2012 ◽  
Vol 174-177 ◽  
pp. 97-101 ◽  
Author(s):  
Hai Peng Zhang ◽  
Wei Li ◽  
Wen De Xiao
Keyword(s):  
Spray Drying ◽  
Dimethyl Ether ◽  
Drying Method ◽  
Drying Process ◽  
N2 Adsorption ◽  
Dimethyl Ether Synthesis ◽  
Synthesis Catalysts ◽  
Attrition Resistance ◽  
Ether Synthesis ◽  
Different Content

Direct dimethyl ether synthesis catalysts containing different content of SiO2 are prepared by spray drying method and characterized by XRD, N2 adsorption, and Polarizing Microscope. It is found that the spray drying process improved the spherical of the catalyst particles and the attrition resistance of the catalyst is increased by the addition of SiO2. The SiO2 formed a framework throughout the catalyst and has little effect on the morphology of CuO, ZnO and HZSM-5. The activity of the catalyst shows a little decrease with the SiO2 addition.

Dimethyl Ether Synthesis Catalysts, Processes and Reactors

2013 ◽  
Vol 2 (1) ◽  
pp. 68-81 ◽  
Author(s):  
Grigore Bozga ◽  
Ioan T. Apan ◽  
Raluca E. Bozga
Keyword(s):  
Dimethyl Ether ◽  
Dimethyl Ether Synthesis ◽  
Synthesis Catalysts ◽  
Ether Synthesis

Studies on Deactivation of the Catalyst in Direct Dimethyl Ether Synthesis

2012 ◽  
Vol 10 (1) ◽  
Author(s):  
Haipeng Zhang ◽  
Wei Li ◽  
Wende Xiao
Keyword(s):  
Synergistic Effect ◽  
Dimethyl Ether ◽  
Catalyst Deactivation ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
N2 Adsorption ◽  
Methanol Synthesis Catalyst ◽  
Dimethyl Ether Synthesis ◽  
Before And After ◽  
Ether Synthesis

Abstract Direct dimethyl ether (DME) synthesis from syngas has been increasingly attracted attentions. Relationship between the synergistic effect and the deactivation behavior of hybrid catalysts was studied in this paper. Two kinds of catalysts with different synergistic effect were tested in a fixed bed reactor and the catalysts before and after stability testing were characterized by XRD, N2-adsorption and TGA. Results show that the deactivation behavior of the catalyst is mainly caused by the deactivation of the methanol synthesis catalyst. Sintering of Cu particles is the main reason of the catalyst deactivation. In addition, coking during synthesis is another reason for the catalyst deactivation. Both the two reasons are deeply affected by the synergistic effect.

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

2008 ◽  
Vol 47 (18) ◽  
pp. 7130-7130 ◽  
Author(s):  
Majid Mollavali ◽  
Fereydoon Yaripour ◽  
Hossein Atashi ◽  
Saeed Sahebdelfar
Keyword(s):  
Dimethyl Ether ◽  
Kinetics Study ◽  
Intrinsic Kinetics ◽  
Dimethyl Ether Synthesis ◽  
Ether Synthesis

Dimethyl ether synthesis via methanol dehydration over Ta-supported catalysts

2019 ◽  
Vol 582 ◽  
pp. 117088 ◽  
Author(s):  
Concepción Herrera ◽  
Marina Cortés-Reyes ◽  
M. Ángeles Larrubia ◽  
M. Vanesa Domínguez-Barroso ◽  
M. Rocío Díaz-Rey ◽  
...  
Keyword(s):  
Dimethyl Ether ◽  
Supported Catalysts ◽  
Methanol Dehydration ◽  
Dimethyl Ether Synthesis ◽  
Ether Synthesis

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

2011 ◽  
Vol 66-68 ◽  
pp. 1404-1409 ◽  
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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