Role of support and promoter in the selective conversion of isophorone to 3,5-xylenol over chromia catalysts

摘要

A detailed study has been undertaken regarding the role of support and promoter towards 3,5-xylenol selectivity improvements in the vapor-phase aromatization of isophorone.The supports used in this study include Al_2O_3,SiO_2,ZrO_2,MgO and carbon covered alumina for Cr_2O_3 catalysts._K2O has been used as a promoter for these catalysts.Influence of solvent during Cr_2O_3 MgO catalyst preparation step has also been studied.The parameters governing the aromatization selectivity observed from this study are:moderate acidic sites,coordinatively unsaturated sites of Cr_2O_3 and smaller crystallites of Cr_2O_3.