Study of the Effects of Varying Reaction Temperatures on Surface Properties and Coking Behavior of Toluene Disproportionation Catalysts
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℃ .
toluene disproportionationcokingporescatalystcomprehensive two-dimensional gas chromatography
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