The kinds of molecular sieve 4a

molecular sieve 4a has two kinds of natural zeolite and synthetic zeolites. (1) most of the natural zeolite by volcanic tuff and gray matter in the Marine sedimentary rocks coagulation or react to form in the lacustrine environment. Has now found that more than 1000 kinds of zeolite ore, more important is 35 kinds, common clinoptilolite and mordenite, erionite and ling zeochem molecular sieves, etc. Mainly distributed in the United States, Japan, France and other countries, China is also found that there is a lot of mordenite and clinoptilolite deposits, Japan is the largest country in the production of natural zeolite. (2) by natural zeolite resource constraints, starting in the 1950 s, a large number of the synthetic zeolite.

Commodity molecular sieve common prefix digital classifying crystalline structure of different molecular sieves, such as 3 a, 4 a, 5 a molecular sieve. 4 A type or class A in the table, aperture 4 A. Type A molecular sieve as containing Na + Na - A, if one was Na + K + displacement, pore size is about 3 A, namely type for 3 A molecular sieve; If there is more than A third in the Na - A Na + Ca2 + displacement, pore size of about 5 A, is the type 5 A molecular sieve.