Preparation of Silica, Alumina, Titania, and Zirconia with Different Pore Sizes Using Sol–Gel Method and Their Properties as Matrices in Catalytic Cracking

• Published in: Industrial & engineering chemistry research 2018-10, Vol.57 (43), p.14394-14405
• Main Authors: Ishihara, Atsushi, Tatebe, Kosuke, Hashimoto, Tadanori, Nasu, Hiroyuki
• Format: Article
• Language: English
• ISSN: 0888-5885; 1520-5045
• DOI: 10.1021/acs.iecr.8b03019

Different mesoporous sizes of oxides, silica, alumina, titania, and zirconia were made by changing calcination temperature, and mixed catalysts, the mixtures of the oxides and microporous zeolite, were prepared. Conversions of n-dodecane using the β zeolite-mixed catalysts were much higher than those of the Y zeolite-mixed catalysts. Using the mixed catalysts, overcracking was inhibited and the selectivity for gasoline increased, compared with those of zeolite singles and the catalysts mixed with kaolin. Curie point pyrolyzer (CPP) was also used as a facile estimation method of catalysts on catalytic cracking of VGO. In catalytic cracking of both n-dodecane and VGO, the product distribution hardly changed by patterns of matrices, but changed by types of zeolite. In contrast, the conversion changed, depending on matrix oxides, indicating that matrices could control the dispersion of zeolite and the diffusion of reactants by their pore structures to increase the catalytic activity.