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The La-ZSM-5 zeolite with different contents of La was synthesized by the hydrofhermal method.The physico-chemical properties of the materials were studied.The results of FT-IR analyses indicated that La might be incorporated into the framework of ZSM-5 zeolite.The NH_3-TPD analyses showed that the amount of weak acid sites of the zeolite decreased with a continuously increasing La content.Afterwards,the La-ZSM-5 zeolite was used as the support of PtSnNa catalyst for propane dehydrogenation.The test results revealed that the utilization of La-ZSM -5 zeolite could achieve a high propene conversion,and effectively inhibit the coke formation on the catalyst surface.When the content of La was 0.16%,the catalytic activity and stability of the catalyst got the best of its performance.Besides,the PtSnNa/La(0.16%)-ZSM-5 catalyst is more stable than the conventional PtSnNaLa/ ZSM-5 catalysts.
The La-ZSM-5 zeolite with different contents of La was synthesized by the hydrofhermal method. The physico-chemical properties of the materials were studied. The results of FT-IR analyzes indicated that La might incorporated into the framework of ZSM-5 zeolite.The NH_3-TPD analyzes showed that the amount of weak acid sites of the zeolite decreased with a continuously increasing La content. Afterwards, the La-ZSM-5 zeolite was used as the support of PtSnNa catalyst for propane dehydrogenation.The test results revealed that the utilization of La-ZSM-5 zeolite could achieve a high propene conversion, and effectively inhibit the coke formation on the catalyst surface. What the content of La was 0.16%, the catalytic activity and stability of the catalyst got the best of the performance.Besides, the PtSnNa / La (0.16%) - ZSM-5 catalyst is more stable than the conventional PtSnNaLa / ZSM-5 catalysts.