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On effective locations of catalytic active sites in phase boundary catalysts

Zeolite loaded with alkylsilane-covered titanium oxide was found to be more effective than its nonporous silica counterpart as phase-boundary catalyst (PBC) to promote epoxidation of alkenes with aqueous hydrogen peroxide. It was demonstrated that the phase-boundary catalyst system required neither...

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Main Authors:	Nur, Hadi, Mohd. Ran, Nur Hidayah, Attan, Nursyafreena, Ikeda, Shigeru, Ohtani, Bunsho
Format:	Article
Published:	2012
Subjects:	QD Chemistry
Online Access:	http://eprints.utm.my/id/eprint/47293/ http://dx.doi.org/10.5614%2Fitbj.sci.2012.44.2.5
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spelling	my.utm.472932019-03-31T08:38:00Z http://eprints.utm.my/id/eprint/47293/ On effective locations of catalytic active sites in phase boundary catalysts Nur, Hadi Mohd. Ran, Nur Hidayah Attan, Nursyafreena Ikeda, Shigeru Ohtani, Bunsho QD Chemistry Zeolite loaded with alkylsilane-covered titanium oxide was found to be more effective than its nonporous silica counterpart as phase-boundary catalyst (PBC) to promote epoxidation of alkenes with aqueous hydrogen peroxide. It was demonstrated that the phase-boundary catalyst system required neither stirring to make an emulsion, nor addition of a cosolvent to make a homogeneous solution to drive the reaction. However, some basic facts about them remain unclear, such as the question as to where an effective location of the active sites of PBC resides: is it on the external surface of the catalysts, or in their pores? In order to elucidate this problem, TS-1, HZSM-5 and zeolite loaded with alkylsilane–covered sulfonic acid in which the location of the active sites is mainly inside the pore system, were chosen as model catalysts. Catalytic activities of the catalysts TS-1 and HZSM-5 were examined after modification with n-octadecyltrichlorosilane (ODS). Their activities were compared with zeolite loaded with alkysilane-covered titanium oxide particles, in which the active sites are on the external surface in reactions of 1-octene with aqueous H2O2 and cyclohexene with water as model reactions. The study suggests that the location of the active sites on the external surface plays an important role in the phenomenon of phase-boundary catalysis. 2012 Article PeerReviewed Nur, Hadi and Mohd. Ran, Nur Hidayah and Attan, Nursyafreena and Ikeda, Shigeru and Ohtani, Bunsho (2012) On effective locations of catalytic active sites in phase boundary catalysts. ITB Journal of Science, 44A (2). pp. 152-163. ISSN 1978-3043 http://dx.doi.org/10.5614%2Fitbj.sci.2012.44.2.5 DOI:10.5614%2Fitbj.sci.2012.44.2.5
institution	Universiti Teknologi Malaysia
building	UTM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Malaysia
content_source	UTM Institutional Repository
url_provider	http://eprints.utm.my/
topic	QD Chemistry
spellingShingle	QD Chemistry Nur, Hadi Mohd. Ran, Nur Hidayah Attan, Nursyafreena Ikeda, Shigeru Ohtani, Bunsho On effective locations of catalytic active sites in phase boundary catalysts
description	Zeolite loaded with alkylsilane-covered titanium oxide was found to be more effective than its nonporous silica counterpart as phase-boundary catalyst (PBC) to promote epoxidation of alkenes with aqueous hydrogen peroxide. It was demonstrated that the phase-boundary catalyst system required neither stirring to make an emulsion, nor addition of a cosolvent to make a homogeneous solution to drive the reaction. However, some basic facts about them remain unclear, such as the question as to where an effective location of the active sites of PBC resides: is it on the external surface of the catalysts, or in their pores? In order to elucidate this problem, TS-1, HZSM-5 and zeolite loaded with alkylsilane–covered sulfonic acid in which the location of the active sites is mainly inside the pore system, were chosen as model catalysts. Catalytic activities of the catalysts TS-1 and HZSM-5 were examined after modification with n-octadecyltrichlorosilane (ODS). Their activities were compared with zeolite loaded with alkysilane-covered titanium oxide particles, in which the active sites are on the external surface in reactions of 1-octene with aqueous H2O2 and cyclohexene with water as model reactions. The study suggests that the location of the active sites on the external surface plays an important role in the phenomenon of phase-boundary catalysis.
format	Article
author	Nur, Hadi Mohd. Ran, Nur Hidayah Attan, Nursyafreena Ikeda, Shigeru Ohtani, Bunsho
author_facet	Nur, Hadi Mohd. Ran, Nur Hidayah Attan, Nursyafreena Ikeda, Shigeru Ohtani, Bunsho
author_sort	Nur, Hadi
title	On effective locations of catalytic active sites in phase boundary catalysts
title_short	On effective locations of catalytic active sites in phase boundary catalysts
title_full	On effective locations of catalytic active sites in phase boundary catalysts
title_fullStr	On effective locations of catalytic active sites in phase boundary catalysts
title_full_unstemmed	On effective locations of catalytic active sites in phase boundary catalysts
title_sort	on effective locations of catalytic active sites in phase boundary catalysts
publishDate	2012
url	http://eprints.utm.my/id/eprint/47293/ http://dx.doi.org/10.5614%2Fitbj.sci.2012.44.2.5
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score	13.211869

On effective locations of catalytic active sites in phase boundary catalysts

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