An effective route to improve the catalytic performance of SAPO-34 in the methanol-to-olefin reaction

Abstract

An effective route to improve the catalytic performance of SAPO-34 in the methanol-to-olefin reaction by simple oxalic acid treatment was investigated. The samples were characterized by XRD, SEM, N₂ adsorption-desorption, XRF, TG, ²⁹Si MAS NMR and NH₃-TPD techniques. The results indicated that the external surface acidity of SAPO-34 was finely tuned by oxalic acid treatment, and the selectivity to C₂H₄ on SAPO-34 and the catalyst lifetime in the methanol-to-olefin reaction were greatly improved.