NEW TYPE OF SAPO MOLECULAR SIEVE AND METHOD FOR SYNTHESIS THEREOF

摘要

Provided are a SAPO molecular sieve having CHA and GME intergrowth crystal phases, and a method for synthesizing same. The feature of broad peaks and sharp peaks coexisting is apparent in the XRD diffraction spectrogram of the SAPO molecular sieve, the inorganic framework thereof having the chemical composition (Si_xAl_yP_z)O₂, wherein x, y, and z represent the mole fractions of Si, Al, and P, respectively, having the ranges of x=0.01 to 0.28, y=0.35 to 0.55, and z=0.28 to 0.50, respectively, and x+y+z=1. The molecular sieve may serve as a catalyst for an acid catalysis reaction, such as a methanol-to-olefins reaction; a reductive elimination reaction is selected for NO_x, and also may be used for the adsorption and isolation of N₂, CH₄, and CO₂.