Natural rectorite mineral: A promising substitute of kaolin for in‐situ synthesis of fluid catalytic cracking catalysts
Natural rectorite mineral: A promising substitute of kaolin for in‐situ synthesis of fluid catalytic cracking catalysts
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DOI：
10.1002/aic.12195
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发表时间：
2010-11
期刊：
影响因子：
3.7
通讯作者：
Baoying Wei;Haiyan Liu;Tiesen Li;Liyuan Cao;Yu Fan;Xiaojun Bao
中科院分区：
文献类型：
--
作者：
Baoying Wei;Haiyan Liu;Tiesen Li;Liyuan Cao;Yu Fan;Xiaojun Bao
长期以来，高岭土一直是催化裂化催化剂的原料或基质，但由于高岭土质量差，难以得到高性能的催化裂化催化剂。本研究旨在探索累托石作为一种天然硅铝酸盐矿物，通过原位合成技术替代高岭土制备FCC催化剂的潜力。系统研究了累托石矿物的化学组成、结构、热行为和化学反应活性，并与工业高岭土进行了比较。结果表明，经过适当处理的累托石矿物可替代高岭土用于合成FCC催化剂。此外，我们还发现了水热稳定的ZSM-5/累托石复合材料，其中约10%的ZSM-5晶体在水热稳定的ZSM-5/累托石复合材料中生长。以800°C煅烧的累托石矿物为原料，可以在预制累托石基质上生长出粒径约为2 μm的纳米颗粒。当用作FCC添加剂时，所获得的ZSM-5/累托石复合物表现出提高的轻质烯烃（乙烯和丙烯）产率。
Fabrication of high-performance fluid catalytic cracking (FCC) catalysts is suffering from the shortage of high-quality kaolin that has long been used as matrix or starting material for synthesizing FCC catalysts. This work aimed at exploring the potential of rectorite, a natural aluminosilicate mineral, to substitute kaolin for preparing FCC catalysts through in-situ synthesis technique. The physicochemical properties of a rectorite mineral, including its chemical composition, structure, thermal behavior, and chemical reactivity, were systemically investigated and compared with those of commercial kaolin. The results showed that the rectorite mineral suitably treated could substitute kaolin for synthesizing FCC catalysts. Moreover, we had shown that a hydrothermally stable ZSM-5/rectorite composite in which ZSM-5 crystals of ca. 2 μm in size were overgrown on preformed rectorite substrate could be synthesized using the rectorite mineral calcined at 800°C as raw material. When used as FCC additive, the obtained ZSM-5/rectorite composite demonstrated enhanced light olefin (ethylene and propylene) yields.