Type A molecular sieve belongs to the molecular sieve, which is similar to that of NaCl that belongs to the cubic crystal system. Since the effective aperture of 4A molecular sieve is 0.4nm,, it is called 4A molecular sieve, and its spatial network structure is composed of silicon oxygen tetrahedral units (SiO4] and aluminum oxygen tetrahedra [AlO4] units.China Pseudo Boehmite website:http://www.sd-alumina.com/pseudo-boehmite/
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