In-situ Crystallized Zeolite/Kaolin Catalysts with Reduced Crystal Size for Enhanced Heavy Oil Cracking

doi:10.1007/s40242-026-5249-3

Chemical Research in Chinese Universities ›› 2026, Vol. 42 ›› Issue (1): 127-133.doi: 10.1007/s40242-026-5249-3

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In-situ Crystallized Zeolite/Kaolin Catalysts with Reduced Crystal Size for Enhanced Heavy Oil Cracking

ZHANG Li¹, QIN Yucai², LIU Honghai¹, HU Qingxun¹, LIU Huangfei¹, FANG Hua¹, ZHENG Ben¹, GUAN Huiming²

1. Lanzhou Petrochemical Research Center, Petrochemical Research Institute, PetroChina, Lanzhou 730060, P. R. China;
2. Key Laboratory of Petrochemical Catalytic Science and Technology of Liaoning Province, Liaoning Petrochemical University, Fushun 113001, P. R. China

Received:2025-10-15 Online:2026-02-01 Published:2026-01-28
Contact: ZHANG Li,E-mail:zhangl3@petrochina.com.cn E-mail:zhangl3@petrochina.com.cn
Supported by:
This work was supported by the Major Science and Technology Projects of PetroChina (Nos. 2016E-0701, 2019A-1809), the Fund Project of PetroChina (No. 2020-CB-01-07), the National Natural Science Foundation of China (No. 21902068), and the PetroChina Innovation Foundation (No. 2020D-5007-0401).

Abstract

Abstract: Reducing mass transfer and diffusion resistance of heavy oil macromolecules on catalyst surface is critical for improving the cracking performance of fluid catalytic cracking (FCC) catalysts. One effective approach is the synthesis of nano-sized zeolites, which shortens diffusion pathways and enhances catalytic efficiency. In this study, a low-cost alkaline functional additive was incorporated into an in-situ crystallization process to prepare FCC catalysts containing small-crystal Y zeolite. The effects of zeolite crystal size on texture properties and catalytic performance were systematically investigated. The resulting catalysts exhibited a distinct structure, with nano-sized Y zeolite primarily distributed in the outer layer of the microspheres. Compared with the conventional sample (ZK-T, average crystal sizes ca. 600 nm), the nanosized sample (ZK-N) showed higher crystallinity, a larger Brunauer-Emmett-Teller (BET) surface area, and a greater density of Brønsted acid sites. Adsorption experiments using macromolecular probes, together with advanced catalyst evaluation (ACE) tests, confirmed that smaller zeolite crystals significantly enhanced mass transfer and heavy oil cracking performance. These findings demonstrate that FCC catalysts performance depends not only on zeolite content but also on diffusion path length. Reducing zeolite crystal size offers a practical and scalable strategy for improving heavy oil conversion efficiency.

Key words: Fluid catalytic cracking (FCC), In-situ crystallization, Crystal size, Effective diffusion, Heavy oil cracking performance

ZHANG Li, QIN Yucai, LIU Honghai, HU Qingxun, LIU Huangfei, FANG Hua, ZHENG Ben, GUAN Huiming. In-situ Crystallized Zeolite/Kaolin Catalysts with Reduced Crystal Size for Enhanced Heavy Oil Cracking[J]. Chemical Research in Chinese Universities, 2026, 42(1): 127-133.

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In-situ Crystallized Zeolite/Kaolin Catalysts with Reduced Crystal Size for Enhanced Heavy Oil Cracking

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