Abstract
SBA-15-supported Al2O3-P2O5 with 10 wt% Al2O3 and different P2O5 mass percentages (10Al2O3-xP2O5/SBA-15) were prepared by simple impregnation method and used for gas-phase selective O-methylation of catechol to guaiacol with dimethyl carbonate. The 10Al2O3-xP2O5/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 P2O5 decreased the strength of weak acid, but with the P2O5 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 P2O5 promoted more acid sites and lower the strength of acid sites. The basic sites increased with the increase of P2O5 content. Acidic sites are the key to control the catalytic activity, and basic sites are the key to control the catalytic selectivity. 10Al2O3-5P2O5/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.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (52334009), the Science and Technology Commission of Shanghai Municipality (No. 21DZ1208900), Open Project of State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, Shanghai University (SKLASS-2023-Z17) and the Science and Technology Commission of Shanghai Municipality (No. 20511107700).
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L. Zhou wrote the main manuscript text, R Hong completed the data collation of Figure.3 and Figure.4, X. Zou and X. Wang revised the manuscript. All authors reviewed the manuscript.
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zhou, L., Zou, X., Hong, R. et al. Gas-phase O-methylation of catechol with dimethyl carbonate over SBA-15-supported aluminum phosphate catalyst. J Porous Mater (2024). https://doi.org/10.1007/s10934-024-01598-5
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DOI: https://doi.org/10.1007/s10934-024-01598-5