The preparation of Mo/γ-Al 2 O 3 catalysts with controllable size and morphology via adjusting the metal-support interaction and their hydrodesulfurization performance

Yuan, Pei; Cui, Chunsheng; Han, Wei; Bao, Xiaojun

doi:10.1016/j.apcata.2016.06.017

Cited by 31 publications

(6 citation statements)

References 43 publications

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“…The sol–gel method (adapted from Amrute et al) and the HNC technique (adapted from Han et al) were chosen as significantly different methods to the more common wet impregnation technique. Both techniques have been shown to produce well-dispersed MoO 3 nanoparticles on either a SiO 2 ,− or Al 2 O 3 support. To the best of our knowledge, the carburization of these oxide particles from both techniques has not been performed before.…”

Section: Introductionmentioning

confidence: 99%

CO₂ Reduction over Mo₂C-Based Catalysts

et al. 2021

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Four Mo-based catalysts were prepared via three different synthesis techniques supported on SiO2 and/or SBA-15. By means of complementary in situ characterization techniques, the carburization process and the final characteristics of these catalysts were investigated. Additionally, the four catalysts were evaluated for the activation of CO2 in the absence and presence of H2 (reverse water–gas shift, RWGS). The results suggest that CO2 reacts via a dissociation on the carbide surface, forming adsorbed oxygen surface species. Severe oxidation of the carbide into its oxidic phases (MoO2 or MoO3) only occurs at temperatures above 850 K in the presence of CO2. O2 dissociates on the carbide surface when introduced at low concentrations (1 vol %) at room temperature, but when exposed to higher concentrations, a strong exothermic bulk re-oxidation reaction occurs, forming MoO2. All four catalysts show high RWGS activity in terms of CO2 conversions with a minimum CO selectivity of 98% without any signs of bulk catalyst oxidation. Although minimal, the observed deactivation is suggested to be primarily due to phase changes between Mo2C allotropes (β-phase, oxycarbide, and η-phase) and/or sintering of the active phase.

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Section: Introductionmentioning

confidence: 99%

CO₂ Reduction over Mo₂C-Based Catalysts

et al. 2021

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“…Analyzing the effect of metal-support interaction on alumina-supported molybdenum catalysts (Mo/γ-Al 2 O 3 ), with different concentrations, Yuan et al [28] observed that the variation in the reduction temperature of the Mo species and the volume of H 2 consumed varies with the degree of dispersion of the metal over the catalyst surface. The greater the metallic dispersion and metal-support interaction, the higher the reduction temperature of the Mo species.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Direct ammoxidation of glycerol to nitriles using Mo/alumina catalysts

Silva

Santos

Silva

et al. 2021

Reac Kinet Mech Cat

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Redox phase unpromoted molybdenum catalysts with different Mo loadings (2.5% Mo/γ-Al 2 O 3 ; 5.0% Mo/γ-Al 2 O 3 ; 7.5% Mo/γ-Al 2 O 3 and 10.0% Mo/γ-Al 2 O 3 ) were prepared and characterized for the ammoxidation of glycerol to nitriles, such as acrylonitrile. The best catalyst (10.0% Mo/γ-Al 2 O 3 ) obtained a yield of 26% in nitriles. The increase in the molybdenum content and its oxidation states along with the amount of weak/moderate acid sites on the support surface are key points for the optimization of the catalysts.

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“…e ODS can be performed by several methods which include solvent extraction, photocatalytic oxidation, microwave catalytic oxidation, and so on [16][17][18]. Apart from this, several other methods are being intensively studied to improve the current HDS technology by developing more effective catalysts and other materials used in this process [19].…”

Section: Introductionmentioning

confidence: 99%

Ionothermal Synthesis of Metal Oxide-Based Nanocatalysts and Their Application towards the Oxidative Desulfurization of Dibenzothiophene

Alenazi

Alsalme

Alshammari

et al. 2020

Journal of Chemistry

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Herein, different types of metal-containing ionic liquid (IL) complexes and various metal oxide-based nanocatalysts have been successfully prepared (from ionic liquids) and applied for the oxidative desulfurization (ODS) of dibenzothiophene (DBT). The ILs complexes are comprised of N,N′-dialkylimidazolium salts of the type [RMIM-Cl]2[MCln], where [RMIM+] = 1 alkyl-3-methylimidazolium and M = Mn(II)/Fe(II)/Ni(II)/Co(II). These complexes were prepared using an easy synthetic route by refluxing the methanolic solutions of imidazolium chloride and metal chlorides under facile conditions. The as-prepared complexes were further used as precursors during the ionothermal and chemical synthesis of various metal oxide-based nanocatalysts. The resulting ILs salts and metal oxides NPs have been characterized by FT-IR, TGA, XRD, SEM, and TEM analysis. The results indicate that thermal and chemical treatment of ILs based precursor has produced different phases of metal oxide NPs. The calcination produced α-Fe2O3, Mn3O4, and Co3O4, NPs, whereas the chemical treatment of the ILs salts have led to the production of Fe3O4, Mn2O3, and α-Co(OH)2. All the as-prepared salts and metal oxide-based nanocatalysts were used as catalysts towards ODS of dibenzothiophene. The oxidation of dibenzothiophene was performed at atmospheric conditions using hydrogen peroxide as the oxygen donor. Among various catalysts, the thermally obtained metal oxide NPs such as α-Fe2O3, Mn3O4, and Co3O4, have demonstrated relatively superior catalytic activities compared to the other materials. For example, among these nanocatalysts, α-Fe2O3 has exhibited a maximum conversion (∼99%) of dibenzothiophene (DBT) to dibenzothiophene sulfone (DBTO2).

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The preparation of Mo/γ-Al 2 O 3 catalysts with controllable size and morphology via adjusting the metal-support interaction and their hydrodesulfurization performance

Cited by 31 publications

References 43 publications

CO₂ Reduction over Mo₂C-Based Catalysts

CO₂ Reduction over Mo₂C-Based Catalysts

Direct ammoxidation of glycerol to nitriles using Mo/alumina catalysts

Ionothermal Synthesis of Metal Oxide-Based Nanocatalysts and Their Application towards the Oxidative Desulfurization of Dibenzothiophene

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The preparation of Mo/γ-Al 2 O 3 catalysts with controllable size and morphology via adjusting the metal-support interaction and their hydrodesulfurization performance

Cited by 31 publications

References 43 publications

CO2 Reduction over Mo2C-Based Catalysts

CO2 Reduction over Mo2C-Based Catalysts

Direct ammoxidation of glycerol to nitriles using Mo/alumina catalysts

Ionothermal Synthesis of Metal Oxide-Based Nanocatalysts and Their Application towards the Oxidative Desulfurization of Dibenzothiophene

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Product

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CO₂ Reduction over Mo₂C-Based Catalysts

CO₂ Reduction over Mo₂C-Based Catalysts