Influence of Carbon Content in Ni-Doped Mo2C Catalysts on CO Hydrogenation to Mixed Alcohol

Abstract

Herein, we synthesize the Ni-doped Mo2C catalysts by a one-pot preparation method to illuminate the effect of the number of carbon atoms in Mo2C lattice on CO hydrogenation to mixed alcohol. The Ni doping inhibits the agglomeration of Mo2C crystals into large particles and the surface carbon deposition, which increase the active surface area. In addition, the interaction between Ni and Mo increases the electron cloud density of Mo species and promotes the non-dissociative adsorption and insertion of CO. Especially, our results indicate that with the increase of the nickel content, the number of carbon atoms in Mo2C lattice on the surface of the catalyst shows a volcano type variation. The low carbon content induces the formation of coordination unsaturated molybdenum species which exhibit the higher catalytic activity and mixed alcohol selectivity than other molybdenum species. Among the catalysts, the MC-Ni-1.5 catalyst with Ni/Mo molar ratio of 1.5:8.5, which has the largest amount of coordination unsaturated molybdenum species, shows the highest space-time yield of mixed alcohols, which is three times higher than that of the Mo2C catalyst.

Conductive metal-covalent organic frameworks as novel catalytic platforms for reduction of nitrate to ammonia

“…S14a †), showing two peaks at 230.9 and 234.1 eV, which are ascribed to the Mo 5+ 3d 5/2 and 3d 3/2 , respectively. 39 The peak at 237.3 eV indicates the presence of an Mo 6+ structure, possibly resulting from mild oxidation during the synthetic process. The XPS spectra of N 1s (Fig.…”

Promoted MoxCy‐based Catalysts for the CO2 Oxidative Dehydrogenation of Ethane

“…Full carburization to a mixture of cubic α‐MoC 1‐x and η‐MoC 0.59 begins at 578 °C for 1Ni20Mo and 600 °C for 1Pt20Mo. While the formation of cubic α‐MoC 1‐x is well known in the presence of Pt, [22] the cubic carbide formation in the presence of Ni is not reported consistently in literature [23–24] …”

“…While the formation of cubic α-MoC 1-x is well known in the presence of Pt, [22] the cubic carbide formation in the presence of Ni is not reported consistently in literature. [23][24] The carburization process in the fixed-bed reactor set-up was monitored by means of mass spectrometry (MS) (see Figure S1). To the specification of the MS, either the reactant gas stream (for 20Mo [a] and 1K20Mo) or the reactor effluent gas stream (for 20Mo, 1Fe20Mo, 1Ni20Mo and 1Pt20Mo) is diluted, maintaining a consistent CH 4 and H 2 absolute flowrate.…”

Enhancing the Overall Electrocatalytic Water-Splitting Efficiency of Mo2C Nanoparticles by Forming Hybrids with UiO-66 MOF

“…Scanning electron microscopy (SEM) images for pure Mo 2 C and UiO-66 are shown in Figure 2 a and b, respectively, and their morphology is in accordance with the cited literature. 43 , 44 Figure 2 c and d shows SEM images for hybrids MCU-1 and MCU-3, respectively. Figure 3 shows SEM images for hybrid MCU-1 at various resolutions.…”