Sources of molecular sieve by divided into two kinds of natural zeolite and synt

Sources of molecular sieve by divided into two kinds of natural zeolite and synthetic zeolite. 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, clinoptilolite and mordenite are so common, erionite, etc. Mainly distributed in Japan and other countries, China has a large number of mordenite and clinoptilolite mineral deposits have been found.
Molecular sieve can be divided by skeleton elements silicon aluminum type molecular sieve, phosphorus kind of molecular sieves and molecular sieve skeleton atoms;
According to the hole size
Less than 2 nm microporous molecular sieves
2 ~ 50 nm mesoporous molecular sieve
More than 50 nm macroporous 4 a molecular sieve
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 that pore size 4 a. Type A molecular sieve containing NA + NA - remember A, if one was NA + k + displacement, pore diameter of about 3 A type is 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.