三种分子筛催化苯胺缩合制二苯胺性能研究

HY, Hβ and HMOR were used as matrix, mixed with pseudoboehmite and aluminium sol respectively. The catalysts were prepared by mechanical extrusion method. The catalysts were characterized by XRD, N ₂ -sorption, NH ₃ -TPD and pyridine adsorption infrared spectroscopy (Py-IR). The experiment of aniline condensation to diphenylamine was carried out in a fix-bed reactor to evaluate the catalytic activity of prepared catalyst. The results show that the strong acid in the zeolite plays a decisive role in the activity of the catalyst, the type of acid has weak effect on the catalytic performance; the pore size of the zeolite has a significant effect on the selectivity of dipheny- lamine, and the smaller pore size is not conducive to the formation and diffusion of diphenylamine, reducing the selectivity of the target product. Therefore, the effects of acidity and pore size on the conversion of aniline and the selectivity of diphenylamine should be importast point when designing and selecting the catalyst for diphenylamine condensation.