Effects of temperature and feed composition on catalytic dehydration of methanol to dimethyl ether over γ-alumina

Raoof, Freshteh; Taghizadeh, Majid; Eliassi, Ali; Yaripour, Fereydoon

doi:10.1016/j.fuel.2008.03.025

Cited by 121 publications

(66 citation statements)

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“…Figure 6 shows the inhibition effect of water on the MTD process. During the methanol dehydration reaction, water is produced which also has a significant effect on catalyst deactivation [17][18][19][20] as η-Al 2 O 3 is super-hydrophilic [21], and facilitates strong water adsorption. Both water and methanol compete for adsorbing on the active sites of η-Al 2 O 3 with water being adsorbed more strongly [17].…”

Section: Effect Of Catalyst Weightmentioning

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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Section: Effect Of Catalyst Weightmentioning

confidence: 99%

Kinetic Investigation of η-Al2O3 Catalyst for Dimethyl Ether Production

Osman

Abu‐Dahrieh

2018

Catal Lett

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“…The MeOH dehydration reaction to yield DME is very appealing due to the potential widespread use of DME as an alternative fuel to help meet our future energy needs. [15][16][17][18] Industrially, this reaction is usually carried out over γ-Al 2 O 3 or zeolites such as ZSM-5, 19,20 which possess strong acid sites that are prone to rapid deactivation. Weaker acid sites on WO 3 are expected to have lower rates of deactivation at the expense of lower activities compared to these industrial catalysts.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Influence of Au Nanoparticles on Porous SiO₂–WO₃ and WO₃ Methanol Transformation Catalysts

et al. 2016

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American Chemical SocietyDepuccio, DP.; Ruiz-Rodríguez, L.; Rodriguez-Castellon, E.; Botella Asuncion, P.; López Nieto, JM.; Landry, CC. (2016) AbstractAnalyzing the structural and chemical properties of materials at the interface of metal nanoparticles and metal oxide supports is important for catalytic applications. Tungsten oxide (WO 3 ) is a widely studied catalyst, but changing the catalytic reactivity at the surface of this oxide with metal nanoparticles is of interest. In this work, we sought to modify the redox properties of porous WO 3 and SiO 2 -WO 3 catalysts with sonochemically deposited gold nanoparticles (Au NPs) in order to access and study this reaction pathway. Characterization using powder X-ray diffraction (XRD), high-resolution transmission electron microscopy (HR-TEM), X-ray photoelectron spectroscopy (XPS), and inductively-coupled plasma optical emission spectroscopy (ICP-OES) confirmed that crystalline Au NPs with diameters of 5 -12 nm were distributed throughout the catalysts. Temperature-programmed desorption (TPD) was used to probe the surface acidity of the catalysts. The physic-chemical characteristics of catalysts have been also discussed by considering the catalytic performance of these materials in the aerobic transformation of methanol. Catalysts containing nanocrystalline WO 3 but no Au NPs displayed very high selectivity to DME (> 60%) at all conversions with minor oxidation reactivity, which highlighted the acidic nature of these catalysts. No effect on the acidity of the catalysts was observed by TPD when Au NPs were loaded in the catalysts. The reducibility of the crystalline WO 3 species, however, increased significantly due to the interaction with Au NPs, as observed by temperature-programmed reduction (TPR). In the gas-phase transformation of MeOH under aerobic conditions, catalysts modified with Au NPs showed greater activity compared to non-modified catalysts. In addition, oxidation selectivity to products such as methyl formate as well as formaldehyde, dimethoxymethane, and carbon oxides became heavily favored with only minor dehydration selectivity. The redox properties of these WO 3 catalysts could be tuned by changing the Au loading. More labile lattice oxygen and enhanced redox properties at the surface of WO 3 modified with Au NPs clearly altered these traditional dehydration catalysts to potential oxidation catalysts. Thus, modification of WO 3 with Au is an effective way to expand the MeOH transformation product distribution beyond DME to other useful, oxidized products not typically observed over pure WO 3 .

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“…Among these catalysts, γ-alumina and HZSM-5 are extensively studied and attracted a great deal of attention as potential catalysts due to their high activity and proper stability [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

From laboratory experiments to simulation studies of methanol dehydration to produce dimethyl ether reaction—Part II: Simulation and cost estimation

Tavan

Hosseini

2013

Chemical Engineering and Processing: Process Intensification

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Effects of temperature and feed composition on catalytic dehydration of methanol to dimethyl ether over γ-alumina

Cited by 121 publications

References 10 publications

Kinetic Investigation of η-Al2O3 Catalyst for Dimethyl Ether Production

Kinetic Investigation of η-Al2O3 Catalyst for Dimethyl Ether Production

Investigating the Influence of Au Nanoparticles on Porous SiO₂–WO₃ and WO₃ Methanol Transformation Catalysts

From laboratory experiments to simulation studies of methanol dehydration to produce dimethyl ether reaction—Part II: Simulation and cost estimation

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Effects of temperature and feed composition on catalytic dehydration of methanol to dimethyl ether over γ-alumina

Cited by 121 publications

References 10 publications

Kinetic Investigation of η-Al2O3 Catalyst for Dimethyl Ether Production

Kinetic Investigation of η-Al2O3 Catalyst for Dimethyl Ether Production

Investigating the Influence of Au Nanoparticles on Porous SiO2–WO3 and WO3 Methanol Transformation Catalysts

From laboratory experiments to simulation studies of methanol dehydration to produce dimethyl ether reaction—Part II: Simulation and cost estimation

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Investigating the Influence of Au Nanoparticles on Porous SiO₂–WO₃ and WO₃ Methanol Transformation Catalysts