分子筛是一类新型无机化工材料。广泛用作高效选择性吸附剂、离子交换剂、催化剂及催化剂载体。从化学上讲,分子筛是一类晶体铝硅酸盐,是热力学上的亚稳定态,属矿物学上的沸石类。事实上,有些矿物沸石就具有分子筛的作用,也有些人工合成产物(如A型分子筛)是自然界中找不到的。分子筛具有三维骨架结构。硅-铝-氧原子形成均一的晶穴和微孔,各晶穴之间由微孔相互沟通,成为主通道(往往还含有更小的微孔系统)。只有那些大小和形状合适的分子,才能经孔道出入,其他分子则不被吸附,因而具有筛分分子的作用。分子筛即由此得名。根据晶体结构和化学组成的不同,分子筛分为许 Molecular sieve is a new type of inorganic chemical materials. Widely used as a highly selective adsorbent, ion exchangers, catalysts and catalyst carriers. Chemically, molecular sieves are a class of crystalline aluminosilicates that are thermodynamically metastable and belong to the mineralogy of zeolites. In fact, some mineral zeolites function as molecular sieves and some synthetic products (such as type A zeolites) can not be found in nature. Molecular sieves have a three-dimensional framework structure. The silicon-aluminum-oxygen atoms form uniform crystal cells and micropores, and the crystal cells communicate with each other through the micropores and become the main channel (often containing smaller microporous systems). Only those molecules of the right size and shape can pass through the channels, while the other molecules are not adsorbed, thus having the function of screening molecules. Molecular sieve that is named after. According to the different crystal structure and chemical composition, molecular sieve Xu