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Types of molecular sieves

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  There are two kinds of molecular sieves:natural zeolite and synthetic zeolite.1 Natural zeolites are mostly formed by the reaction of volcanic tuff and tuffaceous sedimentary rocks in the marine or lacustrine environment.It has been found that there are more than 1,000 zeolite minerals,of which 35 are more important.Commonly known are clinoptilolite,mordenite,erionite and chabazite.Mainly distributed in the United States,Japan,France and other countries,China also found a large number of mordenite and clinoptilolite deposits,Japan is the country with the largest amount of natural zeolite mining.2 Because natural zeolites are subject to resource constraints,synthetic zeolites have been used extensively since the 1950s.
  Commercial molecular sieves are commonly used to prefix the molecular sieves with different crystal structures,such as 3A,4A,and 5A molecular sieves.Type 4A is shown in Table A and has an aperture of 4Å.The Na+-containing A-type molecular sieve is referred to as Na-A,and if Na+is replaced by K+,the pore size is about 3Å;that is,the 3A-type molecular sieve;for example,Na-A has 1/3 or more of Na+replaced by Ca2+,and the pore diameter is about 5Å;that is,5A molecular sieve.

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