SSZ-13 molecular sieve，with chabazite (CHA) topology, consists of AlO4 and SiO4 tetrahedron connected end to end by oxygen atoms, formed a ellipsoid cage （0.73 nm1.2 nm）with eight membered ring struct...
SAPO-34 from Dalian Haixin Chemical is formed by introducing Si into the Aluminum phosphate framework with PO2+、AlO2+ and SiO2 tetrahedron, electronegativity, surface proton acidic center and exchange...
