Surface Modification of η–Al2O3 by SiO2 Impregnation to Enhance Methanol Dehydration Activity

Hoyong Jo, Heon Jung, Jin Won Park, Kwang Deog Jung

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Silica impregnated η-Al2O3 catalysts (Si(number)Al) were prepared for methanol dehydration, with the number indicating the Si wt % added to η-Al2O3. The Si(0.25)Al and Si(0.50)Al catalysts with the greatest number of acid sites had the highest methanol dehydration activities among the prepared catalysts. Si addition up to 0.5 wt % increased the number of the acid sites, which was slightly decreased by further Si addition. The number of weak acid sites correlated well with the catalytic activity for methanol dehydration, but was not enough to explain the higher activity of the catalysts containing silica compared with η-Al2O3. The acid sites of the Si(1.0)Al catalyst were less than those of the η-Al2O3 catalyst but the two had similar activity. Si addition primarily increased the Lewis acid sites, although it generated a few new Brønsted acid sites and chemical hydrogen bonded sites. Nonetheless, it was apparent that the increase of Lewis acid sites was the main reason for the enhancement of η-Al2O3 activity by SiO2 addition. On the other hand, the new Brønsted and Lewis acid sites and the chemical hydrogen bonded sites created by Si addition should not be neglected.

Original languageEnglish
Pages (from-to)307-312
Number of pages6
JournalBulletin of the Korean Chemical Society
Volume38
Issue number3
DOIs
Publication statusPublished - 2017 Mar 1

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Dehydration
Impregnation
Methanol
Surface treatment
Lewis Acids
Catalysts
Acids
Silicon Dioxide
Hydrogen
Catalyst activity

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Cite this

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title = "Surface Modification of η–Al2O3 by SiO2 Impregnation to Enhance Methanol Dehydration Activity",
abstract = "Silica impregnated η-Al2O3 catalysts (Si(number)Al) were prepared for methanol dehydration, with the number indicating the Si wt {\%} added to η-Al2O3. The Si(0.25)Al and Si(0.50)Al catalysts with the greatest number of acid sites had the highest methanol dehydration activities among the prepared catalysts. Si addition up to 0.5 wt {\%} increased the number of the acid sites, which was slightly decreased by further Si addition. The number of weak acid sites correlated well with the catalytic activity for methanol dehydration, but was not enough to explain the higher activity of the catalysts containing silica compared with η-Al2O3. The acid sites of the Si(1.0)Al catalyst were less than those of the η-Al2O3 catalyst but the two had similar activity. Si addition primarily increased the Lewis acid sites, although it generated a few new Br{\o}nsted acid sites and chemical hydrogen bonded sites. Nonetheless, it was apparent that the increase of Lewis acid sites was the main reason for the enhancement of η-Al2O3 activity by SiO2 addition. On the other hand, the new Br{\o}nsted and Lewis acid sites and the chemical hydrogen bonded sites created by Si addition should not be neglected.",
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Surface Modification of η–Al2O3 by SiO2 Impregnation to Enhance Methanol Dehydration Activity. / Jo, Hoyong; Jung, Heon; Park, Jin Won; Jung, Kwang Deog.

In: Bulletin of the Korean Chemical Society, Vol. 38, No. 3, 01.03.2017, p. 307-312.

Research output: Contribution to journalArticle

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