Protonation of Al-Grafted Mesostructured Silica Nanoparticles (MSN): Acidity and Catalytic Activity for Cumene Conversion

The hexagonal structure of the mesostructured silica nanoparticles (MSN) based solid acid catalyst was synthesized using 1,2-propanediol as a co-solvent by sol–gel method, followed by aluminum grafting and protonation. The activity of the catalysts was tested for cumene conversion in a pulse microca...

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Main Authors:	M. R., Sazegar, A. A., Jalil, S., Triwahyono, R. R., Mukti, M., Aziz, M. A. A., Aziz, Setiabudi, H. D., N. H. N., Kamarudin
Format:	Article
Language:	English
Published:	Elsevier 2014
Subjects:	TP Chemical technology
Online Access:	http://umpir.ump.edu.my/id/eprint/5336/ http://umpir.ump.edu.my/id/eprint/5336/ http://umpir.ump.edu.my/id/eprint/5336/ http://umpir.ump.edu.my/id/eprint/5336/1/fkksa-2014-setiabudi-Protonation%20of%20Al-grafted%20mesostructured.pdf

id	ump-5336
recordtype	eprints
spelling	ump-53362016-07-21T01:05:10Z http://umpir.ump.edu.my/id/eprint/5336/ Protonation of Al-Grafted Mesostructured Silica Nanoparticles (MSN): Acidity and Catalytic Activity for Cumene Conversion M. R., Sazegar A. A., Jalil S., Triwahyono R. R., Mukti M., Aziz M. A. A., Aziz Setiabudi, H. D. N. H. N., Kamarudin TP Chemical technology The hexagonal structure of the mesostructured silica nanoparticles (MSN) based solid acid catalyst was synthesized using 1,2-propanediol as a co-solvent by sol–gel method, followed by aluminum grafting and protonation. The activity of the catalysts was tested for cumene conversion in a pulse microcatalytic reactor at 323–573 K. XRD, TEM and N2 physisorption results confirmed the hexagonal ordered structure with a pore diameter of 3.4–4.0 nm, a particle size of 70–120 nm and a surface area of 588–995 m2/g. Solid state NMR and IR results confirmed that the aluminum grafting and protonation form framework and extra-framework aluminums which led to generating strong Brønsted and Lewis acidic sites. High activity in the cumene conversion was only observed on HAlMSN producing propylene, benzene, toluene via a cracking on protonic acid sites and producing a main product of α-methylstyrene via a dehydrogenation on Lewis acidic sites at high reaction temperature. While only α-methylstyrene and higher hydrocarbon (⩾C10) were produced at low reaction temperature showing the permanent Brønsted acid sites did not involve in the cumene conversion. It is suggested that the presence of hydrogen and strong Lewis acid sites increased the stability and activity of the HAlMSN catalyst in the cumene conversion. Although the small deactivation of HAlMSN was observed during the reaction due to the formation of small coke deposits on the surface, the reactivation recovered the activity of catalyst and the high activity was still observed after 60 h of reaction. The high stability and activity of HAlMSN in the cumene conversion can be considered as a method for the production of α-methylstyrene via a dehydrogenation process. Elsevier 2014 Article PeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/5336/1/fkksa-2014-setiabudi-Protonation%20of%20Al-grafted%20mesostructured.pdf M. R., Sazegar and A. A., Jalil and S., Triwahyono and R. R., Mukti and M., Aziz and M. A. A., Aziz and Setiabudi, H. D. and N. H. N., Kamarudin (2014) Protonation of Al-Grafted Mesostructured Silica Nanoparticles (MSN): Acidity and Catalytic Activity for Cumene Conversion. Chemical Engineering Journal, 240. pp. 352-361. ISSN 1385-8947 http://dx.doi.org/10.1016/j.cej.2013.12.004 DOI: 10.1016/j.cej.2013.12.004
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English
topic	TP Chemical technology
spellingShingle	TP Chemical technology M. R., Sazegar A. A., Jalil S., Triwahyono R. R., Mukti M., Aziz M. A. A., Aziz Setiabudi, H. D. N. H. N., Kamarudin Protonation of Al-Grafted Mesostructured Silica Nanoparticles (MSN): Acidity and Catalytic Activity for Cumene Conversion
description	The hexagonal structure of the mesostructured silica nanoparticles (MSN) based solid acid catalyst was synthesized using 1,2-propanediol as a co-solvent by sol–gel method, followed by aluminum grafting and protonation. The activity of the catalysts was tested for cumene conversion in a pulse microcatalytic reactor at 323–573 K. XRD, TEM and N2 physisorption results confirmed the hexagonal ordered structure with a pore diameter of 3.4–4.0 nm, a particle size of 70–120 nm and a surface area of 588–995 m2/g. Solid state NMR and IR results confirmed that the aluminum grafting and protonation form framework and extra-framework aluminums which led to generating strong Brønsted and Lewis acidic sites. High activity in the cumene conversion was only observed on HAlMSN producing propylene, benzene, toluene via a cracking on protonic acid sites and producing a main product of α-methylstyrene via a dehydrogenation on Lewis acidic sites at high reaction temperature. While only α-methylstyrene and higher hydrocarbon (⩾C10) were produced at low reaction temperature showing the permanent Brønsted acid sites did not involve in the cumene conversion. It is suggested that the presence of hydrogen and strong Lewis acid sites increased the stability and activity of the HAlMSN catalyst in the cumene conversion. Although the small deactivation of HAlMSN was observed during the reaction due to the formation of small coke deposits on the surface, the reactivation recovered the activity of catalyst and the high activity was still observed after 60 h of reaction. The high stability and activity of HAlMSN in the cumene conversion can be considered as a method for the production of α-methylstyrene via a dehydrogenation process.
format	Article
author	M. R., Sazegar A. A., Jalil S., Triwahyono R. R., Mukti M., Aziz M. A. A., Aziz Setiabudi, H. D. N. H. N., Kamarudin
author_facet	M. R., Sazegar A. A., Jalil S., Triwahyono R. R., Mukti M., Aziz M. A. A., Aziz Setiabudi, H. D. N. H. N., Kamarudin
author_sort	M. R., Sazegar
title	Protonation of Al-Grafted Mesostructured Silica Nanoparticles (MSN): Acidity and Catalytic Activity for Cumene Conversion
title_short	Protonation of Al-Grafted Mesostructured Silica Nanoparticles (MSN): Acidity and Catalytic Activity for Cumene Conversion
title_full	Protonation of Al-Grafted Mesostructured Silica Nanoparticles (MSN): Acidity and Catalytic Activity for Cumene Conversion
title_fullStr	Protonation of Al-Grafted Mesostructured Silica Nanoparticles (MSN): Acidity and Catalytic Activity for Cumene Conversion
title_full_unstemmed	Protonation of Al-Grafted Mesostructured Silica Nanoparticles (MSN): Acidity and Catalytic Activity for Cumene Conversion
title_sort	protonation of al-grafted mesostructured silica nanoparticles (msn): acidity and catalytic activity for cumene conversion
publisher	Elsevier
publishDate	2014
url	http://umpir.ump.edu.my/id/eprint/5336/ http://umpir.ump.edu.my/id/eprint/5336/ http://umpir.ump.edu.my/id/eprint/5336/ http://umpir.ump.edu.my/id/eprint/5336/1/fkksa-2014-setiabudi-Protonation%20of%20Al-grafted%20mesostructured.pdf
first_indexed	2023-09-18T22:00:38Z
last_indexed	2023-09-18T22:00:38Z
_version_	1777414374691962880

Protonation of Al-Grafted Mesostructured Silica Nanoparticles (MSN): Acidity and Catalytic Activity for Cumene Conversion

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