摘要
Y/β核壳结构复合分子筛具有适宜可调的酸性和孔道结构,既具有Y分子筛较好的裂化性能,又具有β分子筛较好的异构化性能,在催化领域受到较为广泛的关注。两种分子筛的有效复合是其发挥作用的重要前提。本文综述了近年来Y/β核壳结构复合分子筛的制备方法,包括硅铝源法、两步晶化法、离子交换法、前体处理法及预置晶种法;分析比较了各种方法的优点以及不足。介绍了该核壳结构复合分子筛在催化裂化、加氢裂化、异构化、有机化工体合成等催化过程方面的应用。在此基础上提出了纳米级壳层厚度的Y/β核壳结构复合分子筛是未来发展趋势,且其在催化领域有着广泛的应用前景。
The studies on synthesis and applications of Y/β core-shell composite molecular sieves in recent years are reviewed in this paper. There are good prospects in Y/β core-shell composites with the abilities of hydrocracking and isomerization. The key to playing its role is the preparation method. Five methods are introduced, including zeolite as silica/aluminum sources method, twostep crystallization process, ion-exchanging, precursor-treating, seeding method. Advantages and disadvantages are also discussed in this paper. The composite molecular sieves are applied in catalytic cracking, hydrocracking, isomerization, synthesis of organic compound and so on. Finally, the developing trend of Y/β core-shell composite is reducing the thickness of the core to nanoscale.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2016年第B11期155-159,共5页
Chemical Industry and Engineering Progress
关键词
分子筛
复合材料
制备
molecular sieves
composites
preparation
