The inorganic cation-tailored "trapdoor" effect of silicoaluminophosphate zeolite for highly selective CO₂ separation.

ABSTRACT: Functional nanoporous materials are widely explored for CO₂ separation, in particular, small-pore aluminosilicate zeolites having a "trapdoor" effect. Such an effect allows the specific adsorbate to push away the sited cations inside the window followed by exclusive admission to the zeolite pores, which is more advantageous for highly selective CO₂ separation. Herein, we demonstrated that the protonated organic structure-directing agent in the small-pore silicoaluminophosphate (SAPO) RHO zeolite can be directly exchanged with Na⁺, K⁺, or Cs⁺ and that the Na⁺ form of SAPO-RHO exhibited unprecedented separation for CO₂/CH₄, superior to all of the nanoporous materials reported to date. Rietve

SUBMITTER: Wang X 

PROVIDER: S-EPMC8246083 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature