Effect of PDADMAC with different molecular weight regulating Hβ Properties on hydrogenation performance of NiMoC/Hβ catalysts

Abstract

Using different molecular weight of PDADMAC as template, Hβ zeolites and NiMoC/Hβ-Mx catalysts were successfully prepared. The textural properties, acidity and active metal dispersion of samples were characterized by XRD, N2 adsorption and desorption, NH3-TPD, Py-FTIR, H2-TPR, XPS, HRTEM characterizations, to have a better understanding of the importance of PDADMAC molecular weight role. Hydrogenation of model compounds, including naphthalene and quinoline, and real oils were performed on a fixed bed to evaluate the NiMoC/Hβ-Mx catalysts aromatics hydrogenation performance. By analyzing the collected liquid and gas products, it was found that the NMCH-M3 catalyst with PDADMAC molecular weight of 400,000–500,000 exhibited excellent hydrogenation performance in both model compounds and real oils. The mesopore diameter of NiMoC/Hβ-Mx catalysts has great effect on hydrogenation of real oils where the larger pore size is favorable for the hydrogenation reaction. Meanwhile, the B/L ratio of total acid sites and strong acid sites have great effect on aromatics hydrogenation.