the Type of Synthesis of zeolite and natural zeolite molecular sieve

Synthesis of zeolite and molecular sieve zeolite in two ways.① the most natural zeolite by volcanic Tuff and tuffaceous sedimentary rocks in marine or lacustrine environment reacts to form.Have been found to have more than 1000 kinds of zeolite minerals, more important has 35 species, common clinoptilolite, mordenite zeolite, Mao Feishi and diamond, etc.Mainly in the United States, Japan, France and other countries, China has a number of mordenite and clinoptilolite zeolite deposit, Japan is the biggest national exploitation of natural zeolite.② resource constraints and by natural zeolite, in the 1950 of the 20th century, the extensive use of zeolite synthesis (see table).

Commodities commonly used prefixes digital crystal structure different mole sieve dehydration  re classified, such as 3A, 4 a, 5 a molecular sieves.In table 4 type a is a class aperture 4Å.Recorded as a molecular sieve containing Na+ Na-A if Na+ K+ replacement, Aperture is approximately 3Å, Which is 3 a molecular sieve;1/3 Na+ over Na-A Ca2+ replacement, Aperture is approximately 5Å, Which is 5 a molecular sieves.