Cu-Ce/HZSM-5催化剂上的乙醇芳构化反应
摘要
A series of Ce/HZSM-5,Cu/HZSM-5,Cu-Ce/HZSM-5 catalysts were prepared by impregnation method,which were characterized by X-ray diffraction(XRD),nitrogen adsorption and temperature programmed desorption of ammonia(NH3-TPD),and used to catalyze the ethanol aromatization.The results indicated that the specific surface area of HZSM-5 was decreased due to the loading of Ce and Cu species,but the framework of HZSM-5 was not changed.At the same time,the strong acid sites decreased severely,and the medium acid sites and weak acid sites increased slightly.Under the conditions of Ce impregnated first and then Cu with Ce and Cu mass fractions of 1.2% and 5%,respectively,the reaction temperature 350℃ and MHSV 1.0 h-1,the total aromatics yield of ethanol aromatization reached 67.6%.