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

Osman, Ahmed I.; Abu‐Dahrieh, Jehad K.; Rooney, David; Halawy, Samih A.; Mohamed, Mohamed A.; Abdelkader, Adel

doi:10.1016/j.apcatb.2012.08.033

Cited by 125 publications

(113 citation statements)

References 38 publications

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“…The preparation of alumina has been described elsewhere [10]. It was prepared from aluminium nitrate nonahydrate that was then precipitated by ammonia solution giving a precipitate which dried at 120 °C and designated as AN120, followed by calcination at 550 °C and designated as η-Al 2 O 3 .…”

Section: Catalyst Preparationmentioning

confidence: 99%

“…Methanol dehydration is known to take place on Lewis acid-pair sites and its rate increases as the surface Lewis acidity increases [11]. It was well reported that γ-Al 2 O 3 , a typical Lewis acid catalyst and also the η-Al 2 O 3 used in the study, can catalyse dehydration of MTD [10]. Several reaction mechanisms have been presented for methanol dehydration on acid catalysts [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…Extensive studies were performed on γ-Al 2 O 3 for MTD reaction. In our previous publication [10]; we showed that γ-Al 2 O 3 and η-Al 2 O 3 catalysts can be prepared from different precursors of aluminium chloride and nitrates, respectively. The produced catalysts showed different surface morphology and acidity with η-Al 2 O 3 showed similar surface characteristics of the commercial zeolite [HZSM-5(80)].…”

Section: Introductionmentioning

confidence: 99%

“…strength and the reaction temperature should be controlled to avoid hydrocarbons formations [10]. The mechanism based on the Lewis acidity, on the other hand, requires adjacent acid-base pair sites to provide the reaction between the adsorbed alcohol molecule on an acidic site and an adsorbed alkoxide anion on a basic site [11].…”

Section: Introductionmentioning

confidence: 99%

“…The weight loss due to desorption of pyridine from the acidic sites was determined as a function of total surface acidity as sites g −1 cat [10]. Scanning electron microscopy (SEM) was carried out on a FEI Quanta 250 FEG MKII with a high-resolution environmental microscope (ESEM) using XT Microscope Control software and linked to an EDX detector.…”

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confidence: 99%

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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: Catalyst Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Kinetic Investigation of η-Al2O3 Catalyst for Dimethyl Ether Production

Osman

Abu‐Dahrieh

2018

Catal Lett

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Application of Catalysts in Biodiesel Production

Gupta

Rathod

2021

Biodiesel Technology and Applications

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Tungsten Catalyst Incorporating a Well‐Defined Tetracoordinated Aluminum Surface Ligand for Selective Metathesis of Propane, [(≡Si−O−Si≡)(≡Si−O−)₂Al−O−W(≡CtBu) (H)₂]

et al. 2018

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A well‐defined aluminium‐bound hydroxyl group on the surface of mesoporous SBA‐15, [(≡Si−O−Si≡) (≡Si−O)2 Al−OH], 3 was obtained by reacting di‐isopropyl aluminium hydride with SBA‐15 treated at 700 °C. The resulting surface [(≡Si−O−Si≡) (≡Si−O) 2 Al (isobutyl) fragment undergoes β‐H elimination at 400 °C leading to [(≡Si−O−Si≡)(≡Si−O−)2Al−O) Al−H]. Further oxidation of this Al‐hydride with N2O leads to 3. This acidic support was used to create a well‐defined surface organo‐tungsten fragment [(≡Si−O−Si≡)(≡Si−O−)2Al−O−W(≡CtBu)(CH2tBu)2] by reacting 3 with W(≡C‐tBu)(CH2‐tBu)3. A further reaction with hydrogen under mild conditions afforded the tungsten carbyne bis‐hydride [(≡Si−O−Si≡)(≡Si−O−)2Al−O−W(H)2(≡C‐tBu)]. The performance of each of the W‐supported catalysts was assessed for propane metathesis in a flow reactor at 150 °C. [(≡Si−O−Si≡)(≡Si−O−)2 Al−O−W(≡CtBu)(H)2] was found to be a single‐site catalyst, giving the highest turnover number (TON=800) and the highest reported selectivity for butane (45 %) vs. ethane (32 %) known for oxide‐supported tungsten complex catalysts (with the supports being silica, silica‐alumina, and alumina). The results demonstrate that modification of the oxide ligands on silica via the creation of Al Lewis acid center as an anchoring site for organometallic complexes opens up new catalytic properties, markedly enhancing the catalytic performance of supported organo‐tungsten species.

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

Cited by 125 publications

References 38 publications

Kinetic Investigation of η-Al2O3 Catalyst for Dimethyl Ether Production

Kinetic Investigation of η-Al2O3 Catalyst for Dimethyl Ether Production

Application of Catalysts in Biodiesel Production

Tungsten Catalyst Incorporating a Well‐Defined Tetracoordinated Aluminum Surface Ligand for Selective Metathesis of Propane, [(≡Si−O−Si≡)(≡Si−O−)₂Al−O−W(≡CtBu) (H)₂]

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

Cited by 125 publications

References 38 publications

Kinetic Investigation of η-Al2O3 Catalyst for Dimethyl Ether Production

Kinetic Investigation of η-Al2O3 Catalyst for Dimethyl Ether Production

Application of Catalysts in Biodiesel Production

Tungsten Catalyst Incorporating a Well‐Defined Tetracoordinated Aluminum Surface Ligand for Selective Metathesis of Propane, [(≡Si−O−Si≡)(≡Si−O−)2Al−O−W(≡CtBu) (H)2]

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Resources

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Tungsten Catalyst Incorporating a Well‐Defined Tetracoordinated Aluminum Surface Ligand for Selective Metathesis of Propane, [(≡Si−O−Si≡)(≡Si−O−)₂Al−O−W(≡CtBu) (H)₂]