Scholarlink

<p>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 <i>ca.</i> 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.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

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

  • 期刊论文

  • 发表日期：

    2026年1月7日

查看全文
  • Li Zhang,
  • Yucai Qin,
  • Honghai Liu,
  • Qingxun Hu,
  • Huangfei Liu,
  • Hua Fang,
  • Ben Zheng,
  • Huiming Guan

摘要

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.