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Liquid phase styrene epoxidation catalyzed by rice husk ash silica derived mesoporous calcium silicate and calcite-type calcium carbonate catalyst

A series of rice husk ash silica derived mesoporous calcium silicate, and calcium carbonate catalysts were synthesized via a direct one-pot synthesis technique by varying the calcium/CTAB molar ratio (0.25, 0.50, 0.75, and 1.00). The aragonite-type calcium carbonate crystalline phase was formed on t...

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Main Authors: Iqbal, Anwar, Tan, Kok-Hou, Adam, Farook, Abu Bakar, Noor Hana Hanif, Ahmad, Mohammad Norazmi, Yusop, Muhammad Rahimi
Format: Article
Language:English
English
Published: Chiang Mai University 2020
Subjects:
QD Chemistry
Online Access:http://irep.iium.edu.my/83878/1/IF%200.325%20ISI-Indexed%20Chiang%20Mai%20J%20Sci.pdf
http://irep.iium.edu.my/83878/7/83878_publisher.pdf
http://irep.iium.edu.my/83878/
https://epg.science.cmu.ac.th/ejournal/
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spelling my.iium.irep.838782020-10-22T04:58:10Z http://irep.iium.edu.my/83878/ Liquid phase styrene epoxidation catalyzed by rice husk ash silica derived mesoporous calcium silicate and calcite-type calcium carbonate catalyst Iqbal, Anwar Tan, Kok-Hou Adam, Farook Abu Bakar, Noor Hana Hanif Ahmad, Mohammad Norazmi Yusop, Muhammad Rahimi QD Chemistry A series of rice husk ash silica derived mesoporous calcium silicate, and calcium carbonate catalysts were synthesized via a direct one-pot synthesis technique by varying the calcium/CTAB molar ratio (0.25, 0.50, 0.75, and 1.00). The aragonite-type calcium carbonate crystalline phase was formed on the catalyst surface when the Ca/CTAB molar ratio was < 1.00, whereas calcite-type calcium carbonate was formed when the Ca/CTAB ratio=1.00. The catalyst with the highest calcium content (1.00CaMST) with calcite-type calcium species was found to be the most active in styrene epoxidation reaction using H2O2 oxidant at mild conditions (60 °C, 3 h). The conversion of styrene and styrene oxide selectivity was 66.9% and 79.2%, respectively. Octahedrally coordinated calcite active sites were identified as more accessible to H2O2 molecules than the nine-fold coordinated aragonite active sites. The product selectivity changed when the catalyst was reused due to the decomposition of carbonate surface active sites. The selectivity of benzaldehyde and phenylacetaldehyde increased when 1.00CaMST was used for the third and fourth cycles. Chiang Mai University 2020-09-17 Article PeerReviewed application/pdf en http://irep.iium.edu.my/83878/1/IF%200.325%20ISI-Indexed%20Chiang%20Mai%20J%20Sci.pdf application/pdf en http://irep.iium.edu.my/83878/7/83878_publisher.pdf Iqbal, Anwar and Tan, Kok-Hou and Adam, Farook and Abu Bakar, Noor Hana Hanif and Ahmad, Mohammad Norazmi and Yusop, Muhammad Rahimi (2020) Liquid phase styrene epoxidation catalyzed by rice husk ash silica derived mesoporous calcium silicate and calcite-type calcium carbonate catalyst. Chiang Mai Journal of Science, 4x (x). pp. 1-20. ISSN 01252526 (In Press) https://epg.science.cmu.ac.th/ejournal/
institution Universiti Islam Antarabangsa Malaysia
building IIUM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider International Islamic University Malaysia
content_source IIUM Repository (IREP)
url_provider http://irep.iium.edu.my/
language English
English
topic QD Chemistry
spellingShingle QD Chemistry
Iqbal, Anwar
Tan, Kok-Hou
Adam, Farook
Abu Bakar, Noor Hana Hanif
Ahmad, Mohammad Norazmi
Yusop, Muhammad Rahimi
Liquid phase styrene epoxidation catalyzed by rice husk ash silica derived mesoporous calcium silicate and calcite-type calcium carbonate catalyst
description A series of rice husk ash silica derived mesoporous calcium silicate, and calcium carbonate catalysts were synthesized via a direct one-pot synthesis technique by varying the calcium/CTAB molar ratio (0.25, 0.50, 0.75, and 1.00). The aragonite-type calcium carbonate crystalline phase was formed on the catalyst surface when the Ca/CTAB molar ratio was < 1.00, whereas calcite-type calcium carbonate was formed when the Ca/CTAB ratio=1.00. The catalyst with the highest calcium content (1.00CaMST) with calcite-type calcium species was found to be the most active in styrene epoxidation reaction using H2O2 oxidant at mild conditions (60 °C, 3 h). The conversion of styrene and styrene oxide selectivity was 66.9% and 79.2%, respectively. Octahedrally coordinated calcite active sites were identified as more accessible to H2O2 molecules than the nine-fold coordinated aragonite active sites. The product selectivity changed when the catalyst was reused due to the decomposition of carbonate surface active sites. The selectivity of benzaldehyde and phenylacetaldehyde increased when 1.00CaMST was used for the third and fourth cycles.
format Article
author Iqbal, Anwar
Tan, Kok-Hou
Adam, Farook
Abu Bakar, Noor Hana Hanif
Ahmad, Mohammad Norazmi
Yusop, Muhammad Rahimi
author_facet Iqbal, Anwar
Tan, Kok-Hou
Adam, Farook
Abu Bakar, Noor Hana Hanif
Ahmad, Mohammad Norazmi
Yusop, Muhammad Rahimi
author_sort Iqbal, Anwar
title Liquid phase styrene epoxidation catalyzed by rice husk ash silica derived mesoporous calcium silicate and calcite-type calcium carbonate catalyst
title_short Liquid phase styrene epoxidation catalyzed by rice husk ash silica derived mesoporous calcium silicate and calcite-type calcium carbonate catalyst
title_full Liquid phase styrene epoxidation catalyzed by rice husk ash silica derived mesoporous calcium silicate and calcite-type calcium carbonate catalyst
title_fullStr Liquid phase styrene epoxidation catalyzed by rice husk ash silica derived mesoporous calcium silicate and calcite-type calcium carbonate catalyst
title_full_unstemmed Liquid phase styrene epoxidation catalyzed by rice husk ash silica derived mesoporous calcium silicate and calcite-type calcium carbonate catalyst
title_sort liquid phase styrene epoxidation catalyzed by rice husk ash silica derived mesoporous calcium silicate and calcite-type calcium carbonate catalyst
publisher Chiang Mai University
publishDate 2020
url http://irep.iium.edu.my/83878/1/IF%200.325%20ISI-Indexed%20Chiang%20Mai%20J%20Sci.pdf
http://irep.iium.edu.my/83878/7/83878_publisher.pdf
http://irep.iium.edu.my/83878/
https://epg.science.cmu.ac.th/ejournal/
_version_ 1681489310354767872
score 13.211869

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