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Gas-phase O-methylation of catechol with dimethyl carbonate over SBA-15-supported aluminum phosphate catalyst
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Gas-phase O-methylation of catechol with dimethyl carbonate over SBA-15-supported aluminum phosphate catalyst
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Journal Article
Gas-phase O-methylation of catechol with dimethyl carbonate over SBA-15-supported aluminum phosphate catalyst
2024
Overview
SBA-15-supported Al
2
O
3
-P
2
O
5
with 10 wt% Al
2
O
3
and different P
2
O
5
mass percentages (10Al
2
O
3
-
x
P
2
O
5
/SBA-15) were prepared by simple impregnation method and used for gas-phase selective O-methylation of catechol to guaiacol with dimethyl carbonate. The 10Al
2
O
3
-
x
P
2
O
5
/SBA-15 catalysts maintained ordered mesoporous structures, but their specific surface areas, pore volumes, and pores decreased with the addition of Al and P oxides. The addition of P
2
O
5
decreased the strength of weak acid, but with the P
2
O
5
content increasing, the additional pseudo-bridging bonds that are similar to amorphous silica-alumina were formed, which enhanced the acidity of weak acid. Brønsted acid sites introduced by P
2
O
5
promoted more acid sites and lower the strength of acid sites. The basic sites increased with the increase of P
2
O
5
content. Acidic sites are the key to control the catalytic activity, and basic sites are the key to control the catalytic selectivity. 10Al
2
O
3
-5P
2
O
5
/SBA-15 exhibited excellent catalytic activities and high selectivity to guaiacol for the O-methylation of catechol, due to the synergistic effect of acid and base sites.
Publisher
Springer US,Springer Nature B.V
Subject
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