Improved MTO Catalysis In SSZ-13 Zeolite By Mesopore Generation
SiO2/Al2O3 Mole Ratio: 22
Na2O Weight %: 0.05
Surface Area, m2/g:530
SSZ-13 Molecular sieve (framework type code CHA) is an aluminosilicate zeolite mineral possessing 0.38 × 0.38 nm micropores. It belongs to the ABC-6 family of zeolites as well as offretite, cancrinite, erionite and other related minerals. The framework topology is the same as that of chabazite but SSZ-13 has high-silica composition with Si/Al > 5 which leads to low cation exchange capacity. The typical chemical formula of the unit cell can be described as QxNayAl2.4Si33.6O72•zH2O (1.4 < x <27)(0.7 < y < 4.3)(1 < z <7), where Q is N,N,N-1-trimethyladamantammonium. The material was patented by Chevron research Company in 1985, and has a potential use as a solid catalyst for the methanol-to-olefins (MTO) process and the selective catalytic reduction (SCR) of NOx.
is composed AlO4 and SiO4 tetrahedra joined by oxygen atoms inclusive, orderly arranged to have eight yuan spheroidal cage ring structure (0.73 nm × 1.2 nm) and three-dimensional intersection pore structure (Figure 1), pore size of 0.38 nm × 0.38 nm, a specific surface area of up to 700 m2 / g. Since SSZ-13 has ordered pore structure, good hydrothermal stability, there is more surface acidic proton center and exchangeable cations and other characteristics, so the removal of NOx in the exhaust, methanol to olefins (MTO), CO2 adsorptive separation exhibits excellent performance