Abstract
AbstractA novel mesoporous solid acid catalyst named UDCaT‐4 was designed by loading persulfated alumina and zirconia (PAZ) into highly oredered, hexagonal mesoporous silica (HMS). UDCaT‐4 was characterized by XRD, BET surface area and pore size analysis which revealed that neither pore blocking nor structure collapse of HMS had occurred. NH3‐TPD and FTIR were used to determine the acid strength and nature of the sulfate ion retained on the surface of UDCaT‐4. It is known that HCl and water have detrimental effects on the activity of the zirconia‐based catalyst. Hence, the activity of UDCaT‐4 was evaluated in comparsion with that of bulk PAZ in the liquid‐phase alkylation of toluene with benzyl chloride and also in the vapour‐phase alkylation of mesitylene with isopropanol, where acid and water are generated in‐situ, respectively, as co‐products. The superior catalytic acivity of UDCaT‐4 is atributed to the uniform dispersion of the superacidic centers of PAZ into HMS vis‐à‐vis bulk PAZ. Reusability and time on‐stream studies reveal that UDCaT‐4 is a robust and reusable catalyst even in the presence of HCl and H2O.
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