The amalgamation of an appropriate cocatalyst is a proficient technique to expand the efficacy of precious Pt-based catalytic materials. In this study, Mo 2 N–TiO 2 with regularly distributed Mo 2 N particles were simply prepared for the deposition of precious Pt nanoparticles (NPs). Numerous techniques were implemented to thoroughly explore, how synthesis method influence the bulk structural, interfacial and cata1ytic features of the as-prepared 3 wt%Pt/TiO 2 and 3 wt%Pt/Mo 2 N–TiO 2 catalytic materials. The catalytic results obviously show that the 3 wt%Pt/Mo 2 N–TiO 2 catalyst has exceptional hydrogenation performance when compared to 3 wt%Pt/TiO 2 catalyst. The 3 wt%Pt/Mo 2 N–TiO 2 catalyst displayed high conversion (72.4 %) of cinnamaldehyde (CAL) with a maximum selectivity (82.1 %) towards C O bond. The excellent hydrogenation performance is attributed to the synergistic interaction taking place between Pt NPs and Mo 2 N entities of 3 wt%Pt/Mo 2 N–TiO 2 . Also, the enhanced standardized dispersal of Pt NPs on the Mo 2 N–TiO 2 surface causes more exposed Pt 0 sites on the 3 wt%Pt/Mo 2 N–TiO 2 surface, which is productive for the improved activation and conversion of C O bond of CAL to yield COL . In addition, the 3 wt%Pt/Mo 2 N–TiO 2 catalyst retained its higher catalytic activity for consecutive five successive rounds without substantial loss in either conversion or selectivity.
The addition of a suitable co-catalyst is an encouraging way to enhance the catalytic performance of Pd based catalyst with low content. Herein, we describe an easy synthesis of Mo 2 N-TiO 2 with well-dispersed Mo 2 N nanoparticles through one pot evaporation-induced self-assembly and nitridation treatment method. Moreover, a green bio-reductive approach with Catalpa Fruit ( CF ) extract was adopted to fabricate Pd/Mo 2 N-TiO 2 catalysts for promoting selective hydrogenation of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) as model reaction. Among these Pd/Mo 2 N-TiO 2 catalysts, 0.8 wt%Pd/Mo 2 N-TiO 2 exhibits significantly high catalytic activity for selective hydrogenation of various nitrophenols and cinnmaldehyde. Importantly, the catalytic activity of the catalyst prepared by the reduction method of the CF extract is higher than that prepared by the reduction method of NaBH 4 . A serials of characterization, including XRD, N 2 adsorption–desorption, TEM, XPS, CO chemisorption and CO-FTIR etc., was carried out to investigate the influence of the prepared method on the surface Pd species and activity. The high performance can be attributed to the specific nanostructure characteristics of the catalyst and the good synergistic effect between Pd and Mo 2 N, improving the dispersion of Pd nanoparticles atoms and the exposure of more active Pd atoms (surface Pd 0 species) on 0.8 wt%Pd/Mo 2 N-TiO 2 due to the CF extract as reductant.
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