Quasi-Single-Layer MoS₂ on MoS₂/TiO₂ Nanoparticles for Anthracene Hydrogenation

Abstract

Developing\nhighly dispersed few stacking layer MoS₂ nanocatalysts\nwith high exposure of active sites is still a challenge in improving\ntheir catalytic activities. Herein, we report a facile strategy for\nfabricating quasi-single-layer (<3 layers) MoS₂/TiO₂ nanocatalysts by a novel one-step hydrothermal method using\nammonium tetrathiomolybdate (ATM) and P25 (TiO₂) as Mo\nprecursor and highly dispersed supporter, respectively. MoS₂ nanosheets on MoS₂/TiO₂ nanocatalysts with\nthe quasi-single layer and slab of less than 10 nm expose maximum\nactive sites of the catalytic anthracene hydrogenation. The results\nof the catalytic anthracene hydrogenation in slurry-bed reactor show\nthat the quasi-single-layer MoS₂/TiO₂ nanocatalyst\nexhibits optimized catalytic hydrogenation performance with the selectivity\nto deep hydrogenation product (AH8) of 51% and hydrogenation percentage\nof 41.4%, which were respectively about 5.7 times and twice those\nof unsupported MoS₂ catalyst. The outstanding catalytic\nactivity of anathracene hydrogenation over the resultant quasi-single-layer\nMoS₂/TiO₂ can be ascribed to the superior structures\nof MoS₂/TiO₂ nanocatalysts. The uniform loading\nof quasi-single-layer MoS₂ nanosheets onto the TiO₂ can remarkably enhance the exposure of active sites and effectively\navoid the self-aggregation of MoS₂ nanosheets.