摘要
分子筛由于具有大量可调变的酸性位点以及良好的择形性和水热稳定性等优点而被广泛应用于石油化工领域的酸催化反应.分子筛骨架铝原子的位置决定了其酸位点的分布,因而骨架铝原子的分布(包括所处的空腔体积、化学环境以及两个铝原子的距离)对其酸催化性能(反应路径及反应速率)影响很大.由于分子筛的合成涉及一个复杂晶化的过程,影响骨架铝原子分布的因素众多,如起始物料的种类和浓度、晶化条件、杂原子以及后处理方法等,科研人员对骨架铝原子调控方法展开了大量的研究.基于此,综述了相关研究成果,以期推动实现以功能为导向的特定铝原子分布分子筛的定向合成.
Abstract
Molecular sieves have been widely used in acid-catalyzed reactions of petrochemical industry because of their variable acidic sites,good shape selectivity and hydrothermal stability.The distribution of acid sites is determined by the position of aluminum atom in the molecular sieve framework,therefore,the distribution of skeleton aluminum atoms(including the pore volume,chemical environment of skeleton aluminum location,the distance between two aluminum atoms)has a great influence on its acid catalytic performance(reaction pathway or reaction rate).Because the synthesis of molecular sieve involves a complex crystallization process,there are many factors affecting the distribution of skeleton aluminum atoms,such as the kind and concentration of starting materials,crystallization conditions,introduction of heteroatoms,and post-treatment methods,etc.Many researchers have done a lot of research on regulation of skeleton aluminum atoms.Based on this,the related research results were reviewed in order to promote the oriented synthesis of specific aluminum atom-distributed molecular sieves.
基金项目
北京市科技新星计划项目(Z211100002121024)
维普
万方数据