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, N 2 adsorption-desorption, XRF, TG, 29 Si MAS NMR and NH 3 -TPD techniques. The results indicated that the external surface acidity of SAPO-34 was finely tuned by oxalic acid treatment, and the selectivity to C 2 H 4 on SAPO-34 and the catalyst lifetime in the methanol-to-olefin reaction were greatly improved.