Beta zeolite synthesis by dry gel conversion and its catalytic performance

Abstract

Beta zeolites was synthesized by dry gel conversion with SiO2/Al2O3 ratios of 30-200, and the crystallized products obtained within 24 h. The products obtained were characterized by XRD, XRF, BET, SEM and 27Al MAS NMR spectrometer and methanol conversion as the catalytic test reaction. The effect of water content in the autoclave, dry gel mass and silica to alumina ratios on the formation of beta zeolite has been investigated. The results suggest that the most critical parameters of the dry gel synthesis of beta zeolite are the water content and dry gel mass in the autoclave during the crystallization process. The optimum the water content was 10 ml, the optimum Mgei / Mwater ratio was 1.5 and the optimum SiO2/Al2O3 ratios was 100. The XRD patterns are showท that highly crystalline beta zeolite by dry gel conversion was obtained with these conditions. For pure beta zeolite was obtained with SiO2/Al2O3 ratio from 30 to 100. The particle size, the BET surface area and the crystallinity of beta zeolites increased with increasing SiO2/Al2O3 ratio. The methanol conversion of beta zeolite synthesized by dry gel conversion depend on the crystallinity of beta zeolites.