Activity and deactivation studies for direct dimethyl ether synthesis using CuO–ZnO–Al2O3 with NH4ZSM-5, HZSM-5 or γ-Al2O3

Abu‐Dahrieh, Jehad K.; Rooney, David; Goguet, Alexandre; Saih, Youssef

doi:10.1016/j.cej.2012.07.011

Cited by 96 publications

(72 citation statements)

References 45 publications

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“…This can be observed as a lower product yield (lower methanol formation rate) in the direct DME experiment at lower temperatures and higher pressures where the influence of the equilibrium on the methanol synthesis is smaller. Such a negative effect can also be seen from the experimental results reported by at least one other research group [18], although it is not discussed specifically by them.…”

Section: Resultssupporting

confidence: 56%

“…There are also claims that coke formation in parallel with methanol synthesis can deactivate the metallic function of the hybrid catalysts [18,19,30]. However, such deactivation was associated with a considerable Fischer-Tropsch activity and paraffin formation, which is not common for typical Cu-based methanol synthesis catalysts.…”

Section: Catalyst Deactivationmentioning

confidence: 99%

“…At the same time, water is known to attenuate coke formation and deposition over both functions of the hybrid catalysts [16,17]. Furthermore, formation of hydrocarbons in parallel with methanol synthesis [18,19] or methanol dehydration [20] can eventually lead to carbon compounds deposition and deactivation of both functions of the hybrid catalyst.…”

Section: Ch 3 Oh(g)mentioning

confidence: 99%

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Direct dimethyl ether synthesis from synthesis gas: The influence of methanol dehydration on methanol synthesis reaction

et al. 2016

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Direct dimethyl ether (DME) synthesis from synthesis gas is studied with regard to potential effects of methanol dehydration on methanol formation and copperbased catalyst performance. For this, the influence of the operating conditions (space velocity, temperature, pressure, time-on-stream and syngas composition) on activity, selectivity and stability of the catalyst was studied and compared for methanol synthesis and direct DME synthesis. The advantage of the direct over the two-step DME synthesis is apparent at conditions where syngas conversion to methanol is thermodynamically limited. However, under the applied operating conditions, results suggest that combining methanol synthesis and dehydration has a negative effect on the methanol formation kinetics. The origin of the observed phenomena is investigated by varying dehydration catalyst and by introducing dehydration products (DME and water) into the methanol synthesis feed. Choice of the solid acid catalyst does not seem to affect methanol formation, and DME is also found to be practically inert over the methanol synthesis catalysts. Water injection, on the other hand, led to a significant decrease in the methanol synthesis rate. Thus, formation of an additional amount of water through methanol dehydration might be an explanation for the lower methanol formation rate in the direct DME synthesis.

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Section: Resultssupporting

confidence: 56%

Section: Catalyst Deactivationmentioning

confidence: 99%

Section: Ch 3 Oh(g)mentioning

confidence: 99%

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Direct dimethyl ether synthesis from synthesis gas: The influence of methanol dehydration on methanol synthesis reaction

et al. 2016

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“…Several possible reasons of the DME synthesis catalyst deactivation have been reported in the literature: coke deposition [26,27], Cu sintering [28] or copper and zinc ion exchange with protons of zeolite [15,29]. García-Trenco et al [29] showed the presence of isolated Cu 2+ cations occupying exchange positions in the HZSM-5 zeolite by EPR spectroscopy.…”

Section: Introductionmentioning

confidence: 95%

The role of external acid sites of ZSM-5 in deactivation of hybrid CuZnAl/ZSM-5 catalyst for direct dimethyl ether synthesis from syngas

Ordomsky

Cai

Sushkevich

et al. 2014

Applied Catalysis A: General

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“…Here, F DME , F CO 2 and F CO are the molar flow rates of DME, CO 2 and CO, respectively in the outlet stream, n Ci is the number of carbon atoms for each of the hydrocarbons (byproducts) and F i is the molar flow rate of these hydrocarbons [13]. Figure 1 shows the XRD diffractograms of Al(NO 3 ) 3 ⋅9H 2 O (precursor), AN120 (as-dried precipitate) and η-Al 2 O 3 .…”

Section: Catalyst Activitymentioning

confidence: 99%

Kinetic Investigation of η-Al2O3 Catalyst for Dimethyl Ether Production

Osman

Abu‐Dahrieh

2018

Catal Lett

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Herein, kinetic modelling and kinetic parameters were used to study methanol dehydration to dimethyl ether reaction and revealed that the best model to fit the experimental data was the Bercic model. The dehydration reaction undergoes dissociative adsorption Langmuir-Hinshelwood mechanism of methanol on the alumina catalyst surface, with the calculated value of the activation energy was 136.7 kJ mol −1 . Moreover, the effect of different kinetic parameters such as the catalyst weight and methanol concentration or water in the feed on the catalytic performance of η-Al 2 O 3 was examined in a fixed bed reactor under the reaction conditions where the temperature ranged from 180 to 350 °C with a WHSV = 12.1 h −1 . Graphical Abstract

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Activity and deactivation studies for direct dimethyl ether synthesis using CuO–ZnO–Al2O3 with NH4ZSM-5, HZSM-5 or γ-Al2O3

Cited by 96 publications

References 45 publications

Direct dimethyl ether synthesis from synthesis gas: The influence of methanol dehydration on methanol synthesis reaction

Direct dimethyl ether synthesis from synthesis gas: The influence of methanol dehydration on methanol synthesis reaction

The role of external acid sites of ZSM-5 in deactivation of hybrid CuZnAl/ZSM-5 catalyst for direct dimethyl ether synthesis from syngas

Kinetic Investigation of η-Al2O3 Catalyst for Dimethyl Ether Production

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