Co-Doped MoS₂ Nanosheets Vertically Grown on Ti₃C₂ MXenes for Efficient Hydrodesulfurization in High-Temperature Environments

Abstract

Hydrodesulfurization (HDS) is an important technique that is widely adopted in the petroleum industry to remove harmful sulfur compounds for environmental protection. MoS2 is the most commonly employed HDS catalyst but tends to stack due to its high surface energy. Active MoS2 nanosheets are anticipated to be well supported for preventing aggregation and increasing accessibility. In the current study, two-dimensional Ti3C2 MXene is utilized as a novel support to controllably anchor MoS2 nanosheets for efficient HDS. The composite of Ti3C2-supported CoMoS2 (CoMoS2/Ti3C2) with a 3D interconnected network was successfully constructed by a facile, one-step hydrothermal method. Detailed characterizations showed that MoS2 nanosheets vertically grew in situ on and between the layers of Ti3C2 MXene. CoMoS2/Ti3C2 possesses a well-defined open structure with a larger specific surface area and a higher proportion of CoMoS active phase compared with unsupported CoMoS2. As catalyzed by CoMoS2/Ti3C2, the reaction rate constant was effectively increased to 2.8 times that on CoMoS2 for the HDS of dibenzothiophene. CoMoS2/Ti3C2 also showed good stability in a harsh high-temperature reaction environment.

Confinement and phase engineering boosting 1T phase MoS2/carbon hybrid for high‐performance capacitive deionization

“…Therefore, the 1T phase MoS 2 demonstrates tremendous potential as a CDI electrode material. Nevertheless, the inadequate exposure of the active sites of MoS 2 nanosheets usually results in poor performance of CDI owing to the aggregation and self‐stacking 33–36 . Therefore, to obtain electrode materials with excellent CDI performance, 1T phase MoS 2 with rich active sites is essential.…”

Highly efficient hydrodesulfurization driven by an in-situ reconstruction of ammonium/amine intercalated MoS2 catalysts

“…Designing high-efficient HDS catalysts is regarded as the straightforward yet desirable choice for further improvement of HDS technology. 8 , 9 Molybdenum disulfide (MoS 2 ) has gained great popularity in petroleum HDS due to its changeable edge structures and unique physicochemical properties. 10 , 11 Generally, MoS 2 predominantly exists in two crystal phases, i.e., 1T and 2H.…”

“… 15 Considerable theoretical and experimental researches have been devoted to investigating the active sites over MoS 2 . 16 , 17 , 18 For HDS reaction, traditional view advocates that the catalytic ability of hydrogenation and cleavage of C-S bonds are indispensable. H 2 dissociation is a key step in hydrogenation via homolytic or heterolytic pathway.…”

Modulating Crystallization of MoS2 Nanostructures by Dimethyl Sulfoxide for Enhanced Hydrodesulfurization

“…Starting from the very early studies on hydrogenation catalysts, molybdenum-based catalysts have been used as industrial HDS catalysts due to their excellent sulfur resistance . Later, transition metal sulfides (TMS), particularly molybdenum disulfide (MoS 2 ), were discovered to possess excellent HDS performance and became the main component of current HDS catalysts. − Some unsupported molybdenum-based catalysts with a well-defined structure exhibited better catalytic activity than traditional supported ones due to their higher concentration of accessible active components. For instance, the commercialized NEBULA NiMoW unsupported catalyst shows more than three times higher activity compared with the traditional commercial catalyst .…”