Engineering Modified Mesoporous Silica Catalysts through Porosity and Surface Acidity Control for Selective Production of DME

Rosanna Viscardi; Vincenzo Barbarossa; Raimondo Maggi; Francesco Pancrazzi

doi:10.4028/www.scientific.net/KEM.894.45

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 894Engineering Modified Mesoporous Silica Catalysts...

Engineering Modified Mesoporous Silica Catalysts through Porosity and Surface Acidity Control for Selective Production of DME

Abstract:

DME has been received the attention as a renewable energy due to its thermal efficiencies equivalent to diesel fuel, lower NO_x emission, near-zero smoke and non-toxic. DME can be obtained by methanol dehydration over solid acid catalysts or directly from syngas over bifunctional catalysts. The catalytic dehydration of methanol to DME has been widely studied in the literature over pure or modified γ -aluminas (γ-Al₂O₃) and zeolites. Mesoporous silica has obtained much consideration due to its well-defined structural order, high surface area, and tunable pore diameter. In this work, sulfonic acid and aluminium modified mesoporous silica were synthesized and tested as catalysts for production of dimethyl ether from methanol. The modified silicas were studied utilizing XRD, N₂ physisorption, pyridine adsorption, and scanning electronic microscopy. The effects of reaction temperature and water deactivation on the methanol selectivity and conversion to dimethyl ether were investigated. Sulfonic acid modified mesoporous silica showed higher selectivity and stability of DME than that of aluminosilicate. The grafting of mesoporous silica with sulfonic groups displayed much more enhanced hydrothermal stability than Al-MCM-41 and γ-Al₂O₃.

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Periodical:

Key Engineering Materials (Volume 894)

Pages:

45-49

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.894.45

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Online since:

July 2021

Authors:

Rosanna Viscardi, Vincenzo Barbarossa, Raimondo Maggi, Francesco Pancrazzi*

Keywords:

Acidity, DME, Mesoporous Silica, Methanol Dehydration, Porosity, Sulfonic Acids

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