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Alkylation of catechol with methanol to guaiacol over sulphate-modified zirconia solid acid catalysts |
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| Authors: | Venkataraman Vishwanathan Gajula Balakrishna Balraj Rajesh Venkatreddy Jayasri Lucky Sikhwivhilu Neil J. Coville |
| Affiliation: | (1) Catalysis and Physical Chemistry Division, India Institute of Chemical Technology, Hyderabad, 500007, India;(2) Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand Johannesburg, Johannesburg, WITS 2050, South Africa |
| Abstract: | A series of sulphate-promoted ZrO2 solid acid catalysts with different contents of SO4 2− were calcined at 450°C in air for 4 h and tested for the liquid-phase alkylation of catechol to guaiacol in a fixed-bed down-flow reactor. The 5 wt.% SO4 2− on ZrO2 showed the best conversion (82%) and selectivity for guaiacol (84%) at 200°C and 1 bar pressure. A smooth correlation was observed between the catalytical activity and surface acidity of sulphated zirconia. Based on our results, a surface mechanism is proposed. |
| Keywords: | Tetragonal phase alkylation catechol sulphated zirconia surface acidity |
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