scholarly journals The Effect of Zeolite Features on the Dehydration Reaction of Methanol to Dimethyl Ether: Catalytic Behaviour and Kinetics

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5577
Author(s):  
Enrico Catizzone ◽  
Emanuele Giglio ◽  
Massimo Migliori ◽  
Paolo C. Cozzucoli ◽  
Girolamo Giordano
Keyword(s):  
Dimethyl Ether ◽  
Crystal Size ◽  
Catalyst Deactivation ◽  
Methanol Conversion ◽  
Dehydration Reaction ◽  
Exponential Factor ◽  
Structure Topology ◽  
Catalytic Behaviour ◽  
Direct Hydrogenation ◽  
Synthesis Of Dimethyl Ether

The synthesis of dimethyl ether (DME) is an important step in the production of chemical intermediate because it is possible to prepare it by direct hydrogenation of CO2. This paper reports the effect of different zeolitic frameworks (such as: BEA, EUO, FER, MFI, MOR, MTW, TON) on methanol conversion, DME selectivity and catalyst deactivation. The effect of crystal size, Si/Al ratio and acidity of the investigated catalysts have been also studied. Finally, the kinetic parameters (such as: ∆H, ∆S and ∆G) have been evaluated together with pre-exponential factor and activation energy for catalysts with FER and MFI structure topology.

Gas-Phase Methanol Carbonylation for Dimethyl Ether and Acetic Acid Co-Production

2012 ◽  
Vol 554-556 ◽  
pp. 760-763 ◽  
Author(s):  
Bin Ru ◽  
Xin Bao Li ◽  
Ling Jun Zhu ◽  
Guo Hui Xu ◽  
Yue Ling Gu
Keyword(s):  
Acetic Acid ◽  
Gas Phase ◽  
Dimethyl Ether ◽  
Reaction Temperature ◽  
Catalyst Surface ◽  
Methanol Conversion ◽  
Methanol Carbonylation ◽  
Synthesis Of Dimethyl Ether

Gas-phase methanol carbonylation over HMOR catalyst was investigated for the synthesis of dimethyl ether (DME) and acetic acid (HOAc). The results revealed that the selectivity of DME reached 98% and the methanol conversion was 45% under the reaction temperature of 493K. While, the selectivity of HOAc was 30% and the methanol conversion reached 80% when reaction temperature was increased to 573K. TEM, SEM, XRD, N2 physisorbtion, XPS and TG-DTG measurements were performed to characterize the texture and structure of the catalyst. Serious coking on the catalyst surface significantly limited the utilization of unmodified HMOR catalyst in the reaction.

scholarly journals A Kinetic Model Considering Catalyst Deactivation for Methanol-to-Dimethyl Ether on a Biomass-Derived Zr/P-Carbon Catalyst

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 596
Author(s):  
Javier Torres-Liñán ◽  
Ramiro Ruiz-Rosas ◽  
Juana María Rosas ◽  
José Rodríguez-Mirasol ◽  
Tomás Cordero
Keyword(s):  
Kinetic Model ◽  
Dimethyl Ether ◽  
Catalyst Deactivation ◽  
Coke Formation ◽  
Methanol Conversion ◽  
The Other ◽  
Methanol Dehydration ◽  
Catalyst Activation ◽  
Other Hand ◽  
Adsorption Of Water

A Zr-loaded P-containing biomass-derived activated carbon (ACPZr) has been tested for methanol dehydration between 450 and 550 °C. At earlier stages, methanol conversion was complete, and the reaction product was mainly dimethyl ether (DME), although coke, methane, hydrogen and CO were also observed to a lesser extent. The catalyst was slowly deactivated with time-on-stream (TOS), but maintained a high selectivity to DME (>80%), with a higher yield to this product than 20% for more than 24 h at 500 °C. A kinetic model was developed for methanol dehydration reaction, which included the effect of the inhibition of water and the deactivation of the catalyst by coke. The study of stoichiometric rates pointed out that coke could be produced through a formaldehyde intermediate, which might, alternatively, decompose into CO and H2. On the other hand, the presence of 10% water in the feed did not affect the rate of coke formation, but produced a reduction of 50% in the DME yield, suggesting a reversible competitive adsorption of water. A Langmuir–Hinshelwood reaction mechanism was used to develop a kinetic model that considered the deactivation of the catalyst. Activation energy values of 65 and 51 kJ/mol were obtained for DME and methane production in the temperature range from 450 °C to 550 °C. On the other hand, coke formation as a function of time on stream (TOS) was also modelled and used as the input for the deactivation function of the model, which allowed for the successful prediction of the DME, CH4 and CO yields in the whole evaluated TOS interval.

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

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.

scholarly journals Gallium nitride catalyzed the direct hydrogenation of carbon dioxide to dimethyl ether as primary product

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Chang Liu ◽  
Jincan Kang ◽  
Zheng-Qing Huang ◽  
Yong-Hong Song ◽  
Yong-Shan Xiao ◽  
...  
Keyword(s):  
Gallium Nitride ◽  
Dimethyl Ether ◽  
High Performance ◽  
Density Functional ◽  
Value Added ◽  
Density Functional Theory Calculations ◽  
Product Distribution ◽  
Spectroscopic Studies ◽  
Direct Hydrogenation ◽  
Hydrogenation Of Co

AbstractThe selective hydrogenation of CO2 to value-added chemicals is attractive but still challenged by the high-performance catalyst. In this work, we report that gallium nitride (GaN) catalyzes the direct hydrogenation of CO2 to dimethyl ether (DME) with a CO-free selectivity of about 80%. The activity of GaN for the hydrogenation of CO2 is much higher than that for the hydrogenation of CO although the product distribution is very similar. The steady-state and transient experimental results, spectroscopic studies, and density functional theory calculations rigorously reveal that DME is produced as the primary product via the methyl and formate intermediates, which are formed over different planes of GaN with similar activation energies. This essentially differs from the traditional DME synthesis via the methanol intermediate over a hybrid catalyst. The present work offers a different catalyst capable of the direct hydrogenation of CO2 to DME and thus enriches the chemistry for CO2 transformations.

scholarly journals Crystal size sensitivity of HMOR zeolite in dimethyl ether carbonylation

2021 ◽  
Vol 154 ◽  
pp. 106309
Author(s):  
Fuli Wen ◽  
Xiangnong Ding ◽  
XuDong Fang ◽  
Hongchao Liu ◽  
Wenliang Zhu
Keyword(s):  
Dimethyl Ether ◽  
Crystal Size

One-step synthesis of dimethyl ether from syngas on ordered mesoporous copper incorporated alumina

2016 ◽  
Vol 25 (5) ◽  
pp. 775-781 ◽  
Author(s):  
Yan Wang ◽  
Yuexian Chen ◽  
Feng Yu ◽  
Dahai Pan ◽  
Binbin Fan ◽  
...  
Keyword(s):  
Dimethyl Ether ◽  
Ordered Mesoporous ◽  
One Step ◽  
Synthesis Of Dimethyl Ether
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