Alkylation of phenol with dimethyl carbonate over AlPO4, Al2O3 and AlPO4-Al2O3 catalysts |
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| Authors: | F. M. Bautista J. M. Campelo A. Garcia D. Luna J. M. Marinas A. A. Romero |
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| Affiliation: | (1) Department of Organic Chemistry, Sciences Faculty, Cordoba University, Avda. S. Alberto Magno, s/no, E-14004 Cordoba, Spain |
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| Abstract: | The vapor-phase catalytic alkylation of phenol with dimethyl carbonate over different AlPO4 (Al/P=1), Al2O3 and AlPO4-Al2O3 (5–25 wt.% Al2O3) catalysts produces anisole (O-alkylation) as the major reaction product althougho-cresol (C-alkylation) and methylanisoles were also found. The reaction is first order in phenol while O-and C-alkylation follow parallel processes. As compared with methanol, DMC is far more effective as a methylating agent, and the methylation proceeds at a lower temperature and with higher O-alkylation selectivity. |
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| Keywords: | Aluminium orthophosphate (AlPO4) AlPO4-Al2O3 phenol/dimethyl carbonate alkylation activity anisole-cresol formation selectivity |
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