A Facile Synthesis of Highly Efficient MXene Supported CoMoS Catalysts for Hydrodesulfurization

Abstract

In this study, ammonium tetrathiomolybdate (ATM) and 2D-layer MXene support were used to prepare more efficient MoS 2 catalysts with cobalt promoter for the elimination of sulfur atoms in thiophene. A series of well-dispersed and highly active MoS 2 and CoÀ MoÀ S phase on MXene catalysts were derived by thermal activation of precursors varying promoter cobalt to molybdenum molar ratio up to 0.6. The physicochemical properties of synthesized catalysts were characterized by XRD, TPR, SEM/EDS, XPS, HRTEM, and Raman spectroscopy. The as-prepared MoS 2 /MXene and CoÀ MoS 2 /MXene catalysts were examined for thiophene hydrodesulfurization (HDS) at 300-400 °C. The synergetic effect between Co and few-layer MoS 2 on MXene, enhanced their HDS activity to ~20.6 mmol g À 1 h À 1 with an excellent turnover frequency of about 55 h À 1 achieved on CoÀ MoS 2 / MXene catalysts, which were 8-fold higher than the conventional CoMoS/alumina catalyst. CoÀ MoS 2 /MXene catalysts produce high butenes selectivity ~73% at low temperature, whereas, at high-temperature alkane levels were increased ~42% in CoMoS phase through hydrogen activation. Hence, the few-layer MoS 2 obtained from ATM and promoter Co intercalated MXene catalysts enhances the rate of CÀ S bond cleavage in HDS, and the result is scrubbing a large volume of sulfur atoms in clean fuel processes.

Oxygen-incorporated 3D flower-like MoS2 microsphere as a bifunctional catalyst for effective synthesis of 2,5-diformyfuran from fructose

“…The reduction peak at 240–375 °C can be ascribed to a partial reduction of edge S atoms linked with two Mo atoms by hydrogen consumption. 48 The reduction peak at 375–440 °C corresponds to the reduction of Mo 6+ to Mo 4+ .…”