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Indium incorporated silica samples with different indium contents were synthesized using a template free sol-gel method.The silica used was extracted from rice husk(RH) and the resulting catalyst was labeled as RH-xIn(x = 5%,10%,15%,and 20%).From the N2 adsorption analysis the presence of type IV isotherm in RH-blank and RH-xIn indicated the mesoporous nature of the catalysts.In the XRD pattern,a broad band at ca.2θ = 25° was observed for all the catalysts which showed them to be amorphous.TEM micrographs revealed that the material is composed of nanoparticles.Friedel-Craft benzoylation of toluene was carried out using the RH-xIn catalyst.The optimum conditions for the benzoylation of toluene were determined and at 373 K,100% conversion and 89% selectivity for the para-product(i.e.4-methylbenzophenone) were obtained.
Indium incorporated silica samples with different indium contents were synthesized using a template free sol-gel method. The silica used was extracted from rice husk (RH) and the resulting catalyst was labeled as RH-xln (x = 5%, 10%, 15 %, and 20%). From the N2 adsorption analysis the presence of type IV isotherm in RH-blank and RH-xIn indicated the mesoporous nature of the catalysts. In the XRD pattern, a broad band at ca.2θ = 25 ° was observed for all the catalysts which showed them to be amorphous. TEM micrographs revealed that the material is composed of nanoparticles. Frienddel-Craft benzoylation of toluene was carried out using the RH-xIn catalyst. optimum conditions for the benzoylation of toluene were determined and at 373 K, 100% conversion and 89% selectivity for the para-product (ie4-methylbenzophenone) were obtained.