Study of the Effects of Varying Reaction Temperatures on Surface Properties and Coking Behavior of Toluene Disproportionation Catalysts
HOU Min, WU Yanan, QI Xiaolan, LI Jingqiu, KONG Dejin
State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, SINOPEC Shanghai Research Institute of Petrochemical Technology Company Limited, Shanghai 201208, China
Abstract： The study investigated the differences in surface properties of catalysts and their coking behavior under various reaction temperatures in the pure toluene disproportion reaction. The structural and surface acidity changes of the catalysts at different reaction temperatures and durations were characterized using X-ray powder diffraction (XRD), N2 adsorption-desorption isotherms, NH3 temperature-programmed desorption (NH3-TPD), and pyridine adsorption infrared spectroscopy (Py-IR). Additionally, thermogravimetric analysis (TGA) and comprehensive two-dimensional gas chromatography (GC×GC) were utilized to conduct spatially resolved quantitative research on the coking behavior within the catalysts at different reaction temperatures. It was found that the amount of soluble coke within the catalysts pores was significantly higher than that on the external surface. Moreover, compared to the reaction at 375 ℃, the catalyst reacting at 350 ℃ formed less coke. Consequently, the catalyst exhibited better stability during the pure toluene disproportionation reaction at 350 ℃.
HOU Min,WU Yanan,QI Xiaolan et al. Study of the Effects of Varying Reaction Temperatures on Surface Properties and Coking Behavior of Toluene Disproportionation Catalysts[J]. Chemical Reaction Engineering and Technology, 2024, 40(3): 202-210.
