Nanotechnological characterization of allofanite and faujasite (Y-faujasite) catalysts and comparing with a commercial FCC catalyst (X-zeolite)

Jiménez, Edward; Lalangui, Santiago; Guacho, Edison; A, Paucar; Herrera, Paulina; Vaca, David; González, Humberto; Ochoa, Patricia; Stahl, Ullrich; López, Gabriel

doi:10.3934/matersci.2019.6.911

Cited by 4 publications

(1 citation statement)

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“…Through the above studies, some inherent laws of the structure–activity relationship for heavy-oil catalytic cracking catalysts have been found and three effective strategies of improving acid-site accessibility have been summed up. One is to shorten the diffusion length of the hydrocarbon molecules. − Another is to increase the size of the mass transfer channels to ensure that macromolecules diffuse successfully in the confined space. − The third is to optimize the distribution of zeolite components in the FCC catalysts for improving the zeolite accessibility and the catalytic reaction performance. − …”

Section: Introductionmentioning

confidence: 99%

Optimized Zeolite Distribution of FCC Catalysts for Promoting Heavy-Oil Catalytic Cracking

Zhang

Qin

et al. 2022

Ind. Eng. Chem. Res.

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The accessibility of cracking active components, mainly zeolite Y, to heavy oil molecules is the key factor to determine the performance of FCC catalysts. In this study, a novel FCC catalyst with Y zeolite components synthesized via in situ crystallization on kaolin microspheres has been designed and prepared. The distribution of the zeolite Y in the FCC catalyst microspheres has been characterized by scanning electron microscopy (SEM) and high-resolution field emission scanning electron microscopy (HR-FESEM). Differing from the random distribution of zeolite components in a commercial FCC catalyst prepared via a spray drying technique, the Y zeolite components are concentrated on the surface of the in situ crystallization FCC catalyst microspheres. The unique distribution characteristics lead to the distinctive structural properties, such as texture constructions and acid properties, mass transfer performance, and zeolite accessibility. The catalytic cracking performance of heavy oil macromolecules of the two catalysts has been investigated using a microactivity test (MAT) and advanced catalyst equipment (ACE). Based on the results, we can conclude that the unique distribution of the zeolite Y on the surface of in situ crystallization FCC catalyst microspheres plays an important role for promoting a greater ability for conversion of heavy oil, higher gasoline selectivity, and lower byproduct yield.

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