Efficient Synthesis of Dimethyl Ether over HZSM-5 Supported on Medium-Surface-Area β-SiC Foam

The performance of bifunctional hybrid catalysts based on phosphotungstic acid (H3PW12O40, HPW) supported on TiO2 combined with Cu-ZnO(Al) catalyst in the direct synthesis of dimethyl ether (DME) from syngas has been investigated. We studied the effect of the HPW loading on TiO2 (from 1.4 to 2.7 monolayers) on the dispersion and acid characteristics of the HPW clusters. When the concentration of the heteropoliacid is slightly higher than the monolayer (1.4 monolayers) the acidity of the clusters is perturbed by the surface of titania, while for concentration higher than 1.7 monolayers results in the formation of three-dimensional HPW nanocrystals with acidity similar to the bulk heteropolyacid. Physical hybridization of supported heteropolyacids with the Cu-ZnO(Al) catalyst modifies both the acid characteristics of the supported heteropolyacids and the copper surface area of the Cu-ZnO(Al) catalyst. Hybridization gives rise to a decrease in the copper surface area and the disappearance of the strong acidic sites typical of HPW nanocrystals, showing all hybrids similar acid sites of weak or medium strength. The activity of the hybrids was tested for direct DME synthesis from syngas at 30 bar and 250 °C; only the hybrids with HPW loading higher than 1.4 monolayers showed activity for the direct synthesis of DME, showing that the sample loaded with 2.7 monolayers of heteropolyacid had higher activity than the reference hybrid representative of the most widely applied catalysts based on the combination of Cu-ZnO(Al) with HZSM-5. In spite of the high activity of the hybrids, they show a moderate loss in the DME production with TOS that denotes some kind of deactivation of the acidity function under reaction conditions.

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Process Simulation and Environmental Aspects of Dimethyl Ether Production from Digestate-Derived Syngas

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph18020807 ◽

2021 ◽

Vol 18 (2) ◽

pp. 807

Author(s):

Aristide Giuliano ◽

Enrico Catizzone ◽

Cesare Freda

Keyword(s):

Dimethyl Ether ◽

Process Simulation ◽

Carbon Capture ◽

Energy Transition ◽

Process Conditions ◽

Co2 Absorption ◽

Environmental Aspects ◽

Dme Synthesis ◽

Water Gas ◽

Synthesis Of Dimethyl Ether

The production of dimethyl ether from renewables or waste is a promising strategy to push towards a sustainable energy transition of alternative eco-friendly diesel fuel. In this work, we simulate the synthesis of dimethyl ether from a syngas (a mixture of CO, CO2 and H2) produced from gasification of digestate. In particular, a thermodynamic analysis was performed to individuate the best process conditions and syngas conditioning processes to maximize yield to dimethyl etehr (DME). Process simulation was carried out by ChemCAD software, and it was particularly focused on the effect of process conditions of both water gas shift and CO2 absorption by Selexol® on the syngas composition, with a direct influence on DME productivity. The final best flowsheet and the best process conditions were evaluated in terms of CO2 equivalent emissions. Results show direct DME synthesis global yield was higher without the WGS section and with a carbon capture equal to 85%. The final environmental impact was found equal to −113 kgCO2/GJ, demonstrating that DME synthesis from digestate may be considered as a suitable strategy for carbon dioxide recycling.

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Effect of copper surface area and acidic sites to intrinsic catalytic activity for dimethyl ether synthesis from biomass-derived syngas

Applied Catalysis B Environmental ◽

10.1016/j.apcatb.2012.06.026 ◽

2012 ◽

Vol 126 ◽

pp. 1-8 ◽

Cited By ~ 38

Author(s):

Ji Woo Jung ◽

Yeong Jun Lee ◽

Soong Ho Um ◽

Pil J. Yoo ◽

Dong Hyun Lee ◽

...

Keyword(s):

Catalytic Activity ◽

Surface Area ◽

Dimethyl Ether ◽

Copper Surface ◽

Dimethyl Ether Synthesis ◽

Acidic Sites ◽

Copper Surface Area ◽

Effect Of Copper ◽

Ether Synthesis

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Effect of Si content on the performance of direct synthesis of dimethyl ether over slurry CuZnAl catalyst prepared by complete liquid phase technology

Journal of Fuel Chemistry and Technology ◽

10.1016/s1872-5813(21)60068-3 ◽

2021 ◽

Vol 49 (6) ◽

pp. 791-798

Author(s):

Kai SUN ◽

Zhong-kai BIAN ◽

Shu-yan CHENG ◽

Gui-ru WANG ◽

Lin ZHANG ◽

...

Keyword(s):

Liquid Phase ◽

Dimethyl Ether ◽

Direct Synthesis ◽

Si Content ◽

Synthesis Of Dimethyl Ether

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Ultrahigh-surface-area hierarchical porous carbon from chitosan: acetic acid mediated efficient synthesis and its application in superior supercapacitors

Journal of Materials Chemistry A ◽

10.1039/c7ta08046h ◽

2017 ◽

Vol 5 (47) ◽

pp. 24775-24781 ◽

Cited By ~ 79

Author(s):

Jianyu Huang ◽

Yeru Liang ◽

Hang Hu ◽

Simin Liu ◽

Yijin Cai ◽

...

Keyword(s):

Acetic Acid ◽

Surface Area ◽

Porous Carbon ◽

Efficient Synthesis ◽

Hierarchical Porous Carbon ◽

Capacitive Properties ◽

Hierarchical Porous

Acetic acid mediated efficient synthesis of ultrahigh-surface-area hierarchical porous carbon from chitosan with very attractive capacitive properties was reported.

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