Enhanced Catalytic Performance for Dimethyl Ether Synthesis from Syngas with the Addition of Zr or Ga on a Cu−ZnO−Al2O3/γ-Al2O3Bifunctional Catalyst

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.

Download Full-text

Effect of CeO2 Loading on the Performance of Pd/γ-Al2O3 Catalysts for one-Step Synthesis of Dimethyl Ether

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.66-68.1193 ◽

2011 ◽

Vol 66-68 ◽

pp. 1193-1198 ◽

Cited By ~ 2

Author(s):

Xian Liang Meng ◽

Ya Fei Liu ◽

Zhong Cai Zhang ◽

Rui Zhi Chu ◽

Zhi Min Zong ◽

...

Keyword(s):

Dimethyl Ether ◽

Total Pore Volume ◽

Catalytic Performance ◽

Pd Dispersion ◽

Dimethyl Ether Synthesis ◽

Catalytic Stability ◽

One Step ◽

Space Time Yield ◽

Ether Synthesis ◽

Synthesis Of Dimethyl Ether

A series of Pd-CeO2/γ-Al2O3 catalysts which have a different CeO2 loading were prepared by impregnation under microwave irradiation. Based on various characterizations, such as XRD, H2-TPR and CO-TPD, the effect of CeO2 loading on catalytic performance and stability of Pd/γ-Al2O3 were examined for one-step dimethyl ether synthesis from syngas. The results show that there are two completely opposite effect on the CO conversation rate of Pd/γ-Al2O3 catalysts after adding CeO2, namely that it can improve Pd dispersion at a suitable loading, hence the CO conversation rate will increase too. However, the surface area and total pore volume of Pd/γ-Al2O3 catalysts decrease by adding excessive CeO2 and CO conversation rate will also reduce. When the CeO2 loading achieve to 2%, catalysts can have relatively high catalytic stability and activity that the CO conversation rate and DME space-time yield can reach 64.7% and 27.82 mmol·ml-1·h-1, respectively.

Download Full-text

Mechanism and catalytic performance for direct dimethyl ether synthesis by CO2 hydrogenation over CuZnZr/ferrierite hybrid catalyst

Journal of Environmental Sciences ◽

10.1016/j.jes.2020.02.015 ◽

2020 ◽

Vol 92 ◽

pp. 106-117 ◽

Cited By ~ 1

Author(s):

Qingtao Sheng ◽

Run-Ping Ye ◽

Weibo Gong ◽

Xiufeng Shi ◽

Bang Xu ◽

...

Keyword(s):

Dimethyl Ether ◽

Catalytic Performance ◽

Co2 Hydrogenation ◽

Hybrid Catalyst ◽

Dimethyl Ether Synthesis ◽

Ether Synthesis

Download Full-text

00/01247 Effects of catalyst ratio and temperature on catalytic performance of a dual catalyst for liquid phase dimethyl ether synthesis from syngas

Fuel and Energy Abstracts ◽

10.1016/s0140-6701(00)92977-1 ◽

2000 ◽

Vol 41 (3) ◽

pp. 142

Keyword(s):

Liquid Phase ◽

Dimethyl Ether ◽

Catalytic Performance ◽

Dimethyl Ether Synthesis ◽

Ether Synthesis

Download Full-text

Dimethyl Ether Synthesis via Methanol Dehydration over Diatomite Catalyst Modified Using Hydrochloric Acid

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.931-932.42 ◽

2014 ◽

Vol 931-932 ◽

pp. 42-46 ◽

Cited By ~ 3

Author(s):

Watcharakorn Pranee ◽

Pornsawan Assawasaengrat ◽

Arthit Neramittagapong ◽

Sutasinee Neramittagapong

Keyword(s):

Hydrochloric Acid ◽

Dimethyl Ether ◽

Active Sites ◽

Fixed Bed ◽

Methanol Conversion ◽

Catalytic Performance ◽

Fixed Bed Reactor ◽

Methanol Dehydration ◽

Dimethyl Ether Synthesis ◽

Ether Synthesis

The synthesis of dimethyl ether via methanol dehydration has been carried out over untreated-diatomite catalyst (DM) and hydrochloric acid modified treatment on diatomite catalyst (DMHC). The reactions were carried out in a fixed-bed reactor. The effects of hydrochloric acid modifications of diatomite on its catalytic performance were studied. The characterization such as XRD, SEM, FT-IR and FT-Raman had no deformation after HCl-modified treatment on catalysts. DMHC catalyst apparently gave the higher methanol conversion rate than DM due to the acidity while the selectivity of dimethyl ether from 250 to 350°C was slightly changed. The acidity was depended upon Al(IV) ions; nevertheless, both Al(V) and Al(VI) were affected and hence increasing the basic active sites. Not only was the competitively catalytic methanol dehydrogenation preferred with basic condition but also methanol-blocking water molecule interaction was the unwanted reaction. In this investigation, the chemical-bond arrangements of silicon and aluminium ions were proposed with solid MAS/NMR. The DMHC catalyst exhibited better DME yield than the DM catalyst, and it could be used as a selective catalyst for DME synthesis from methanol.

Download Full-text