Coupled Co-Doped MoS₂ and CoS₂ as the Dual-Active Site Catalyst for Chemoselective Hydrogenation

Abstract

Catalytic hydrogenation plays an important role in the industrial production of fine chemicals. Herein, we report a Co-doped MoS 2 and CoS 2 composite with a coupling interface and successfully apply it for the chemoselective hydrogenation of p-chloronitrobenzene to pchloroaniline. The target catalyst 0.5CoMoS has ∼100% conversion and ∼100% selectivity. Experiments and theoretical calculations reveal that CoS 2 is more favorable for adsorbing and activating H 2 and provides active hydrogen (H a ) to Co-doped MoS 2 by the coupling interface. By matching the production and consumption rates of H a , the maximization of the reaction yield was achieved. This work may promote the study of MoS 2 -based catalysts for chemoselective hydrogenation.

Conversion of CO2 Hydrogenation to Methanol over K/Ni Promoted MoS2/MgO Catalyst

“…The low-temperature region (200-420 • C) corresponds to the reversible hydrogen adsorption on MoS 2 . The middletemperature region (420-580 • C) is ascribed to the surface S reduction of MoS 2 , and the high-temperature region (>580 • C) is mainly responsible for the large number of sulfur vacancies produced in the bulk of MoS 2 [32]. It can be seen that the higher K content can slightly suppress reduction of H 2 , which is in accordance with the above H 2 -TPD results.…”

Self-Constructing 100% Water-Resistant Metal Sulfides through In Situ Acid Etching for Effective Elemental Mercury (Hg0) Capture

“…Accordingly, a density functional theory (DFT) study was conducted to simulate the CoS x surface covered by different ratios of undercoordinated sulfur. A CoS 2 (100) slab model was established according to the implicative XRD, TEM, and XPS results . The surface coverages of undercoordinated sulfur equaling 0, 10, 30, and 50% were considered.…”

“…A CoS 2 (100) slab model was established according to the implicative XRD, TEM, and XPS results. 48 The surface coverages of undercoordinated sulfur equaling 0, 10, 30, and 50% were considered. As shown in Figure 2c, on the CoS x (100) surface with the coverage of undercoordinated sulfur equaling 0%, the adsorption energy of H 2 O was −35.3 kJ mol −1 , indicating that the pristine CoS 2 (100) surface favored the adsorption of H 2 O.…”

Electron-rich Pt anchored on covalent triazine frameworks for the selective hydrogenation of halogenated nitrobenzenes

“…The selective hydrogenation of halogenated nitroarenes to halogenated amines has attracted considerable attention in research because halogenated amines are important intermediates for the preparation of color film finishers, insecti-cides, and other organic chemicals in the field of dyes, pharmaceuticals, and pesticides. 1,2 As recently reported, non-noble metals such as Ni, 3 Co, 4 Cu, 5 and Mo 6 are typically used for the hydrogenation of nitroarenes, attributed to their low cost and easy accessibility. However, these catalysts usually achieve only poor conversion and selectivity, and the typically employed reaction conditions of high hydrogen pressures and high reaction temperatures also pose considerable safety risks.…”