Preparation of ZSM-5 Encapsulated Pt-La Bimetallic Catalysts and Their Catalytic Performance for iso-Butane Cracking
Pt-xLa@HZSM-5 catalysts(x represents the molar ration of La to Pt,x=0.1,0.25,0.5 and 1.0 in the reaction system)were synthesized via one-pot hydrothermal method.The structure,morphology,acidity and metal species state of catalysts were investigated by X-ray diffraction,scanning and transmission electron microscopy,temperature-programmed desorption of ammonia,pyridine-adsorption infrared spectroscopy,and X-ray photoelectron spectroscopy.According to the results of activity test,Pt-0.25La@HZSM-5 had the best catalytic performance for iso-butane cracking,with a yield of 51.1％for ethylene and propylene at 625 ℃.However,under the same reaction conditions,the yield of ethylene and propylene was only 41.4％on Pt@HZSM-5-0.25La catalyst synthesized by impregnation method for the iso-butane catalytic cracking.
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