Investigation of different precipitating agents effects on performance of γ-Al2O3 nanocatalysts for methanol dehydration to dimethyl ether

Hosseini, Seyyed Yaghoob; Khosravi‐Nikou, Mohammad Reza

doi:10.1016/j.jiec.2014.02.010

Cited by 32 publications

(20 citation statements)

References 33 publications

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“…The high purity metal oxides nanoparticles were synthesized as yet by variety methods such as precipitation, hot-air spray pyrolysis, sol-gel, hydrothermal and sonochemical [9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…For example, alumina has a large surface area, adsorption capacity, and shows good wear resistance [20,21], so it is commonly used as catalyst, catalyst support, filter, and filler for polymers to improve mechanical properties [22,23]. At least, seven different transitional aluminas have been reported and Al 2 O 3 nanoparticle is perhaps, the most important one for its industrial applications [13,15,24,45].…”

Section: Introductionmentioning

confidence: 99%

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PANI-derived polymer/Al2O3 nanocomposites: synthesis, characterization, and electrochemical studies

et al. 2016

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

PANI-derived polymer/Al2O3 nanocomposites: synthesis, characterization, and electrochemical studies

et al. 2016

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“…Hydrothermal treatment mechanism of the prepared c-Al 2 O 3 proposed is as follow: At the initial of the hydrothermal process, AlOOH is formed due to the hydrolysis of urea, which is based on the mechanism of precipitation from supersaturated solution. When the hydrothermal temperature is kept at 90°C, the energy is not enough for crystal orientation, leading to the low growth rate of every crystal plane, and microsphere [35][36][37].…”

Section: Formation Mechanismmentioning

confidence: 99%

“…As the temperature increases to 120°C, the crystal plane with grows preferentially, driven in part by relatively high surface energy and in part by a kinetic effect involving a cyclic generation of highly reactive adsorption sites [31,37]. At the same time, structure directing agent is adsorpted on the surface of AlOOH crystal nucleus.…”

Section: Formation Mechanismmentioning

confidence: 99%

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Study of the preparation of γ-Al2O3 nano-structured hierarchical hollow microspheres with a simple hydrothermal synthesis using methylene blue as structure directing agent and their adsorption enhancement for the dye

Fang

Huang

Ouyang

et al. 2015

Chemical Engineering Journal

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Promoted catalytic performance of sugarcane bagasse ash supported by γ‐alumina as efficient, stable, and ecofriendly catalyst for dehydration of methanol to dimethyl ether

Said,

Goda,

Abd El‐Wahab

et al. 2024

Asia-Pacific J Chem Eng

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The aim of this study was to use different proportions (1% to 20% by weight) of γ‐alumina to modify sugarcane bagasse ash (SCBA) for the production of dimethyl ether (DME) through the dehydration of methyl alcohol. A simple precipitation method was utilized to fabricate (1–20 wt.%) Al2O3/SCBA catalysts. X‐ray fluorescence, X‐ray diffraction, Fourier‐transform infrared spectroscopy, transmission electron microscopy, and N2 sorption were used to explore the structural, spectroscopic, morphological, and textural features. The XRD pattern of Al2O3/SCBA catalysts showed a new peak that corresponded to the formation of γ‐Al2O3. In addition, the average crystallite sizes of pure SCBA and 10% and 20%Al2O3/SCBA catalysts were calculated and found to be 20.1, 21.6, and 22.6 nm, respectively. To evaluate the acidity of these catalysts, the dehydration of isopropyl alcohol and the chemisorption of basic probe molecules were employed. The acidity test results displayed that these catalysts have weak to moderate acidic sites. The 10% Al2O3/SCBA catalyst calcined at 400°C showed high efficiency for the conversion of methyl alcohol to DME, attaining 89% conversion with 100% selectivity. This observation can be attributed to the even distribution of active sites and the acid–base equilibrium on the surface. Moreover, its catalytic activity and selectivity remain unchanged over a continuous 2‐week operation without coke formation, demonstrating its extremely high stability. A strong correlation was observed between the catalytic activity and both the surface area and acidity of the catalysts.

show abstract

Investigation of different precipitating agents effects on performance of γ-Al2O3 nanocatalysts for methanol dehydration to dimethyl ether

Cited by 32 publications

References 33 publications

PANI-derived polymer/Al2O3 nanocomposites: synthesis, characterization, and electrochemical studies

PANI-derived polymer/Al2O3 nanocomposites: synthesis, characterization, and electrochemical studies

Study of the preparation of γ-Al2O3 nano-structured hierarchical hollow microspheres with a simple hydrothermal synthesis using methylene blue as structure directing agent and their adsorption enhancement for the dye

Promoted catalytic performance of sugarcane bagasse ash supported by γ‐alumina as efficient, stable, and ecofriendly catalyst for dehydration of methanol to dimethyl ether

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