Preparation, characterization and naphtha aromatization performance of the catalytic reforming catalyst Pt/MY (M = Mg, Ba or Ce)

Abstract

To solve the problems of chlorine loss and equipment corrosion caused by the conventional alumina-type catalytic reforming catalyst, a series of modified Zeolite Y catalysts supported with 0.3 w% Pt were obtained by the ion exchange of Mg2+, Ba2+ or Ce3+ and then by the impregnation of Pt(NH3)4(NO3)2 solution. Characterizations of the prepared zeolites and catalysts were performed using XRD, SEM, TEM, N2 adsorption-desorption, NH3-TPD, UV–vis DRS and Laser Raman. Catalytic aromatization performance of all the catalysts was investigated in a continuous-flow fixed-bed micro-reaction evaluation unit adopting industrial hydrofining naphtha as the feedstock with sulfur of 0.50 μg/mL. Results of the characterizations showed that Pt grains on the catalysts were distributed in nanometer state. It also showed that the framework of Zeolite Y was only damaged slightly and different acidic properties were generated after ion exchange. Results of the evaluation showed that ion exchange obviously increased aromatization activity of all the catalysts. The aromatization performance of Ce3+ modified catalyst Pt/CeY was the best, which had a reasonable selectivity and a higher activity than commercial alumina-type reforming catalyst.