Synthesis of NiW catalysts supported on hierarchically meso/microporous KIT-5/Beta composites and their hydrodenitrogenation performance of quinoline

Abstract

Meso/microporous composite material KIT-5/Beta (KB) with a cubic Fm3m mesoporous structure and BEA microporous structure was successfully synthesized by an in situ assembly method. And the corresponding NiW/KB catalysts were prepared for the hydrodenitrification (HDN) reactions of quinoline. The supports and catalysts were characterized using XRD, FTIR, N₂-adsorption, TEM, SEM, pyridine-FTIR, XPS and HRTEM techniques. The results revealed that the textural and acidic properties of the composite materials were dramatically improved in comparison to those of pure silica KIT-5. NiW/KB-3 displayed the highest HDN activity (97.44%) among all the catalysts, which was attributed to the synergistic effects of the open channel structure, excellent textural properties, suitable acidity, the best sulfidation and dispersion of active species, implying that KB-3 has potential application in HDN reactions. Moreover, the quinoline HDN reaction networks of the NiW/KB-x series are proposed.