发展甲醇制芳烃（MTA）技术对于实现非石油路线低成本合成优质芳烃,拓展甲醇应用有着重要意义,技术关键是研发具有高芳烃选择性和抗积碳效果的新型催化剂。煤系高岭土富含铝硅酸盐矿物成分,是一种得天独厚的分子筛合成天然原料。本项目打破传统奥斯特瓦德晶体生长机制,提出以高岭土干凝胶为生长基元,在高岭土基层原位取向连接生长取向型分子筛复合膜的新方法；基于MTA催化反应特点,设计b轴-CHA-MFI/高岭土三层复合分子筛膜材料。利用材料的孔道限域效应,将传统的MTA一步反应分为甲醇→烯烃,烯烃→芳烃和芳烃快速扩散三个阶段,以此提高芳烃选择性,缩短中间产物在催化剂中的停留时间,抑制深度副反应发生。新材料将在MTA催化领域表现出异于传统分子筛的催化特性,有望成为具有研究价值和应用前景的前瞻性催化材料。项目研究成果将促进材料,催化和煤化工等学科的交叉与融合,为我国煤液化发展提供技术支撑,具有重要学术价值。

Low-cost and high quality aromatics synthesis by non-oil route is great meaningful for developing methanol to aromatics (MTA) technology and expanding methanol applications. The key technology is to developed a new catalyst with high aromatic selectivity and anti- coking ability. Coal-based kaolin ,rich in a variety of alumino-silicate minerals ,is a unique natural raw material for molecular sieve synthesis. So the project breaks the traditional crystal growth mechanism of Osterwald and puts forward a new method of molecular sieve membrane in-situ growth on the surface of kaolin with the new crystal growth mechanism of oriented junction growth. Based on the characteristics of MTA catalytic reaction, the three-layer composite molecular sieve membrane of b-axis-CHA-MFI/kaolin was also designed and synthesized. From this new material, the traditional one-step reaction of MTA is divided into three stages: methanol to olefin, olefin to aromatics and aromatics to rapidly diffuse, which improves the selectivity of aromatics, shortens the residence time of intermediates in the catalyst, and inhibits sequential side-reactions. It is foreseeable that the new materials will show well catalytic properties different from traditional molecular sieves in the field of MTA, and is expected to be a prospective catalytic material with great research value and application prospects. The research results of the project will also promote the intersection and integration of materials, catalysis and coal chemical engineering, and provide technical support for the development of coal liquefaction in China, and thus having important academic value.