Role of dehydration catalyst acid properties on one-step DME synthesis over physical mixtures

Ramos, Fernanda de Melo; Farias, Andréa M. Duarte de; Borges, Luiz Eduardo Pizarro; Monteiro, J.L.F.; Fraga, Marco A.; Sousa-Aguiar, Eduardo Falabella; Appel, Lucia G.

doi:10.1016/j.cattod.2004.12.007

Cited by 196 publications

(111 citation statements)

References 16 publications

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“…The activity of H-type zeolites has been reported for the dehydration of methanol to DME [15][16][17][18][19]. These zeolites are characterized by their high acidity, however, such high acidity can result in significant coke formation and consequently fast deactivation [20].…”

Section: Furthermore Diesel Exhausts Have Been Linked To Cancer [1] Imentioning

confidence: 99%

Effect of precursor on the performance of alumina for the dehydration of methanol to dimethyl ether

Osman

Abu‐Dahrieh

Rooney

et al. 2012

Applied Catalysis B: Environmental

124

100

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Highlights Effect of precursors on the catalytic performance of alumina. AN samples is higher activity than AC, while AN550 is the optimum one. The AN550 showed methanol conversion and DME selectivity of 72% and 100% at 250 °C, respectively. Acid site density affected catalytic performance among the catalysts with alumina phase. Synthesis of alumina catalyst with high activity compared to commercial γ-Al 2 O 3 .Page 3 of 33 A c c e p t e d M a n u s c r i p t Abstract Dimethyl ether (DME) is amongst one of the most promising alternative, renewable and clean fuels being considered as a future energy carrier. In this study, the comparative catalytic performance of γ-Al 2 O 3 prepared from two common precursors (aluminium nitrate (AN) and aluminium chloride (AC)) is presented. The impact of calcination temperature was evaluated in order to optimise both the precursor and pre-treatment conditions for the production of DME from methanol in a fixed bed reactor. The catalysts were characterized by TGA, XRD, BET and TPD-pyridine. Under reaction conditions where the temperature ranged from 180-300˚C with a WHSV= 12.1 h -1 it was found that all the catalysts prepared from AN(η-Al 2 O 3 ) showed higher activity, at all calcination temperatures, than those prepared from AC(γ-Al 2 O 3 ). In this study the optimum catalyst was produced from AN and calcined at 550 ˚C.This catalyst showed a high degree of stability and had double the activity of the commercial γ-Al 2 O 3 or 87% of the activity of commercial ZSM-5 (80) at 250 ˚C.

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Section: Furthermore Diesel Exhausts Have Been Linked To Cancer [1] Imentioning

confidence: 99%

Effect of precursor on the performance of alumina for the dehydration of methanol to dimethyl ether

Osman

Abu‐Dahrieh

Rooney

et al. 2012

Applied Catalysis B: Environmental

124

100

View full text Add to dashboard Cite

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“…Such catalysts are generally prepared by coprecipitation or mixing of the freshly precipitated precursors [12][13][14][15]. While in the case of the admixed catalyst each function is prepared (synthesized) separately and then the powders of both functions are mechanically blended [16][17][18][19][20][21][22]. It is important that the contact between these functions does not cause blockage of active site for the other.…”

Section: Introductionmentioning

confidence: 99%

“…Moradi et al [35] prepared nine hybrid catalysts and found that physically mixing catalysts showed better performance than the other preparation methods while Ramos et al [16] showed that the rate limiting step of DME direct synthesis was determined by the acid properties of the dehydrating catalyst, i.e., its acid strength and number of acid sites. On the contrary, Kim et al [17] and Sousa-Aguiar et al [36] reported that overall DME direct synthesis can be determined by methanol synthesis rate on the admixed catalyst with metal compositions higher than the optimized one.…”

Section: Introductionmentioning

confidence: 99%

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

Abu‐Dahrieh

Rooney

Goguet

et al. 2012

Chemical Engineering Journal

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“…It has been speculated that DME could be used as domestic fuel 5 . DME can be produced by direct synthesis of DME from syngas or dehydration of methanol [6][7][8] . The direct synthesis refers to a single step via the circulating fl uidized bed 9 or a slurry bubble column reactor using a bifunctional catalyst.…”

Section: Introductionmentioning

confidence: 99%

Process simulation of dimethyl ether synthesis via methanol vapor phase dehydration

Bai¹,

Ma²,

Zhang³

et al. 2013

Polish Journal of Chemical Technology

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The production processes included catalytic dehydration of methanol in an adiabatic fixed-bed reactor and two columns product separations. In this study, the technological process for dimethyl ether (DME) synthesis is built on PRO/II platform based on the combined parameters of the reaction dynamic model for methanol dehydration reaction, the improved NRTL model of the liquid phase, the PR model of vapor phase. In order to validate the proposed model, the simulation results have been compared with the available data from a set of industrial production equipment with a production capacity of 200 000 tonnes per annum. A comparison between the calculated and measured results has proved that these results are satisfactory. The bed height and the volume of the catalytic bed are calculated aim at one million t/a DME yields and while taking account of high-purity DME production. After discussing the infl uence of feed stage location and refl ux ratio for DME product purity, the suitable unit operation conditions are chosen. Accordingly, accurate process simulation results provide the basis and guidance for an improvement and development of the similar industrial device.

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Role of dehydration catalyst acid properties on one-step DME synthesis over physical mixtures

Cited by 196 publications

References 16 publications

Effect of precursor on the performance of alumina for the dehydration of methanol to dimethyl ether

Effect of precursor on the performance of alumina for the dehydration of methanol to dimethyl ether

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

Process simulation of dimethyl ether synthesis via methanol vapor phase dehydration

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