Role of Al in Na-ZSM-5 zeolite structure on catalyst stability in butene cracking reaction.

ABSTRACT: The Na-ZSM-5 catalysts (SiO₂/Al₂O₃ molar ratio = 20, 35, and 50) were prepared by rapid crystallization method to investigate their performance in butene cracking reaction. The XRD, XRF, NH₃-TPD, FT-IR, TPO, UV-Vis, and ¹H, ²⁷Al, ²⁹Si MAS NMR techniques were used to identify the physical and chemical properties of Na-ZSM-5 catalysts. The silanol group (Si-OH) was the main acid site of Na-ZSM-5, and it was proposed to be the active site for the butene cracking reaction. The butene conversion and coke formation were associated with the abundance of silanol groups over the Na-ZSM-5 catalyst. The dealumination, resulting in the deformation of tetrahedral framework aluminum species was a key factor for Na-ZSM-5 catalys

SUBMITTER: Auepattana-Aumrung C 

PROVIDER: S-EPMC7424521 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature