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Liquid Phase Styrene Epoxidation Catalyzed by Rice Husk Ash Silica Derived Mesoporous Calcium Silicate and Calcite-type Calcium Carbonate Catalyst
Paper Type  |
Contributed Paper |
Title |
Liquid Phase Styrene Epoxidation Catalyzed by Rice Husk Ash Silica Derived Mesoporous Calcium Silicate and Calcite-type Calcium Carbonate Catalyst |
Author |
Anwar Iqbal*, Kok-Hou Tan, Farook Adam, Noor Hana Hanif Abu Bakar, Mohammad Norazmi Ahmad and Muhammad Rahimi Yusop* |
Email |
anwariqbal@usm.my; rahimi@ukm.edu.my |
|
Abstract: 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. |
|
Start & End Page |
611 - 630 |
Received Date |
2020-06-02 |
Revised Date |
|
Accepted Date |
2020-09-17 |
Full Text |
Download |
File Supplemental |
Download Supplemental |
Keyword |
calcium silicate, mesoporous silica, styrene epoxidation, styrene oxide, calcium carbonate, rice husk |
Volume |
Vol.48 No.2 (March 2021) |
DOI |
|
Citation |
Iqbal* A., Tan K., Adam F., Bakar N.H.H.A., Ahmad M.N. and Yusop* M.R., 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, 2021; 48(2): 611-630. |
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