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MnSAPO-34 molecular sieves were synthesized by vapor-phase transport(VPT) method using triethylamine(Et3N) as a structure directing agent(SDA),and were characterized by XRD,BET,SEM,UV-Vis,FT-IR,and TG analyses.The influence of the zeolite crystallization conditions and the dry-gel composition were investigated.The results showed that the synthesis conditions had an effect on the crystalline phase.Pure MnSAPO-34 had been obtained when it was crystallized at 140℃ for 18 hours.The ratio of MnO/Al2O3 in the starting gel ranging from 0.1 to 0.2 resulted in pure MnSAPO-34 with a CHA topology.Beyond this scope,MnSAPO-5 with an AFI topology structure was obtained as an impurity substance.UV-Vis spectroscopy and FT-IR spectroscopy study indicated that manganese was incorporated into the framework of the molecular sieve.The catalytic performance of MnSAPO-34 molecular sieve was tested by ketalization reaction of 1,2-propanediol with cyclohexanone.High yield of cyclohexanone-1,2-propanediol ketal was obtained.
MnSAPO-34 molecular sieves were synthesized by vapor-phase transport (VPT) method using triethylamine (Et3N) as a structure directing agent (SDA), and were characterized by XRD, BET, SEM, UV- Vis, FT-IR, and TG analyzes of the zeolite crystallization conditions and the dry-gel composition were investigated. The results showed that the synthesis conditions had an effect on the crystalline phase. Pure MnSAPO-34 had been obtained when it was crystallized at 140 ° C. for 18 hours . The ratio of MnO / Al2O3 in the starting gel ranging from 0.1 to 0.2 resulted in pure MnSAPO-34 with a CHA topology.Beyond this scope, MnSAPO-5 with an AFI topology structure was obtained as an impurity substance. UV-Vis spectroscopy and FT-IR spectroscopy study indicated that manganese was incorporated into the framework of the molecular sieve. catalytic activity of MnSAPO-34 molecular sieve was tested by ketalization reaction of 1,2-propanediol with cyclohexanone. High yield of cyclohexanone-1,2 -propanediol ket al was obtained.