【摘要】 用HY沸石溶解的硅铝合成出HY/MCM-41包覆型复合分子筛。考察了HY添加量、体系p H、晶化时间对其合成的影响。利用XRD、SEM、N2吸附-脱附、NH₃-TPD等对样品进行表征。以3,4-二甲酚为模型化合物,对负载TiO₂的HY/MCM-41催化剂加氢脱甲基性能进行评价。结果表明,TiO₂/YM-c复合催化剂特殊的孔道结构和酸性质的协同作用在3,4-二甲酚加氢脱甲基反应中表现出较好的催化性能。3,4-二甲酚转化率及苯酚和间甲酚的选择性分别为50.82%、62.17%和36.32%。更多还原

【Abstract】 HY/MCM-41 coated composite molecular sieve is synthesized by using silica-alumina dissolved from HY zeolite as the "nutrient"substance for synthesizing MCM-41. Effects of the addition amount of HY,p H value of the system,and the crystallization time on the synthesis are investigated.XRD,SEM,N2 adsorption-desorption,and NH₃-TPD characterization methods are utilized to characterize the samples.Taking 3,4-xylenol as a model compound,the catalytic performance of HY/MCM-41 catalyst supported TiO₂ in the hydrodemethylation reaction is evaluated. It is shown that TiO₂/YM-c composite catalyst exhibits better catalytic performance and stability in the hydrodemethylation reaction of3,4-xylenol due to the synergistic effect between special pore structure and acid properties of the catalyst,and the conversion of 3,4-xylenol,and the selectivity to phenol and m-cresol is 50. 82%,62. 17% and 36. 32%,respectively.更多还原