Molybdenum-promoted cobalt supported on SBA-15: Steam and sulfur dioxide stable catalyst for CO oxidation

Lima, Thiago M.; Macedo, Vinícius de; Silva, Domingos S. A.; Castelblanco, William N.; Pereira, Cristiane Aparecida; Roncolatto, Rodolfo E.; Gawande, Manoj B.; Zbořil, Radek; Varma, Rajender S.; Urquieta‐González, Ernesto A.

doi:10.1016/j.apcatb.2020.119248

Cited by 33 publications

(9 citation statements)

References 106 publications

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“…Similarly, in the Auger spectrum of Cu LMM (Figure d), peaks at 913.1, 917.1, and 920.8 eV correspond to Cu + , Cu 2+ , and Cu 0 , respectively. , The doublet separation between the 2p 3/2 and 2p 1/2 signals approaches 15.5 eV (Figure b), which agrees with the standard spectra of elemental cobalt, suggesting the existence of Co 3+ or Co 2+ species . The satellite peak at 789.6 eV corresponds to Co 2+ , and the peaks at 785.2 and 780.5 eV correspond to the binding energies of Co 2+ and Co 3+ , respectively, indicating that cobalt exists mainly in the form of oxides. − …”

Section: Resultssupporting

confidence: 77%

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Non Noble-Metal Copper–Cobalt Bimetallic Catalyst for Efficient Catalysis of the Hydrogenolysis of 5-Hydroxymethylfurfural to 2,5-Dimethylfuran under Mild Conditions

et al. 2021

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The efficient catalysis of the hydrogenation of 5-hydroxymethylfurfural (HMF) to 2,5-dimethylfuran (DMF) over non noble-metal catalysts has received great attention in recent years. However, the reaction usually requires harsh conditions, such as high reaction temperature and excessively long reaction time, which limits the application of the non noble-metal catalysts. In this work, a bimetallic Co x -Cu@C catalyst was prepared via the pyrolysis of MOFs, and an 85% DMF yield was achieved under a reaction temperature and time of 160 °C and 3 h, respectively. The results of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDX) mapping, and other characterization techniques showed that the synthesis method in this paper realized the in situ loading of cobalt into the copper catalyst. The reaction mechanism studies revealed that the cobalt doping effectively enhanced the hydrogenation activity of the copper-based catalyst on the C–O bond at a low temperature. Moreover, the bimetallic Co x -Cu@C catalyst exhibited superior reusability without any loss in the activity when subjected to five testing rounds.

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Section: Resultssupporting

confidence: 77%

“… 36 The satellite peak at 789.6 eV corresponds to Co 2+ , and the peaks at 785.2 and 780.5 eV correspond to the binding energies of Co 2+ and Co 3+ , respectively, indicating that cobalt exists mainly in the form of oxides. 37 − 39 …”

Section: Resultsmentioning

confidence: 99%

Non Noble-Metal Copper–Cobalt Bimetallic Catalyst for Efficient Catalysis of the Hydrogenolysis of 5-Hydroxymethylfurfural to 2,5-Dimethylfuran under Mild Conditions

et al. 2021

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“…XPS characterization analyses were conducted to determine the difference in the chemical states of the Co , species in the Co/β-Mo 2 C and Co/MoO 2 catalysts (Figure b). Co 0 species with a binding energy of 777.7 eV are the main species in Co/MoO 2 , whereas the positively shifted peaks assigned to Co 2+ species dominate in Co/β-Mo 2 C, which confirms the formation of a new active center.…”

Section: Results and Discussionmentioning

confidence: 99%

Efficient and Stable Co/β-Mo₂C Catalyst for Hydroformylation

et al. 2021

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The hydroformylation of olefins is one of the most important industrial processes used for aldehyde synthesis, which commonly involves the use of scarce and expensive rhodium-based catalysts. It is therefore important to develop inexpensive catalysts, e.g., cobalt-based catalysts with sufficiently high activity and stability for hydroformylation. However, conventional metallic Co clusters, acting as active centers, suffer from low activity and severe metal leaching. Here, we show that Mo 6 C 2 -bonded Co can serve as an efficient active center for propene hydroformylation, with a total turnover number of 3158 after five in situ cycles, which is approximately 7.5 times higher than that of conventional metallic Co clusters. Furthermore, the developed Co 6 Mo 6 C 2 catalyst effectively suppresses cobalt leaching, demonstrating its stability in a long-lasting test. The results of theoretical calculations and characterization analyses demonstrate that the enhanced activity and stability of Mo 6 C 2 -bonded Co result from a reduction in the overall energy barrier for hydroformylation and the stability of the Co 6 Mo 6 C 2 crystal structure, which originates from the strong interaction between Co and the support.

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“…The result of Co XPS in Co@MoS 2 -S V further suggests that the Co atoms occupied some of the S vacancies and interacted with Mo atoms, forming a CoMoS microenvironment. [49,50] The doublet peaks at 781.6 and 797.2 eV can be assigned to the cobalt oxide phase arising from unavoidable surface oxidation, a common phenomenon in XPS. [51] The electron spin resonance (ESR) spectroscopy was carried out to confirm the vacancy-filling process.…”

Section: Materials Characterizationmentioning

confidence: 99%

Constructing Reactive Micro‐Environment in Basal Plane of MoS₂ for pH‐Universal Hydrogen Evolution Catalysis

Koudakan

Wei

Mosallanezhad

et al. 2022

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lack of high-performance catalysts regardless of electrolyte pH. [7][8][9] Although optimizing the acidity of the electrolyte can tune the activity of a catalyst, designing the pseudo-pH-independent catalyst may make the water electrolyzers more affordable and safer for commercial H 2 production and home usage, respectively. [10,11] As one of the most renowned transitional metal dichalcogenides (TMDs), molybdenum disulfide (MoS 2 ) shows significant tuning potential for HER. [12][13][14][15][16][17] However, due to the inefficient cleavage of water molecules and sluggish H desorption, the activity of MoS 2 is unsatisfactory in overall pH values. [18][19][20][21][22] As reported by previous works, although the limited edge site with the unsaturated coordination is an active site for HER, especially in acidic media, the whole basal plane with the majority of atoms is immensely inert, the essence of the disappointing HER performance. [23][24][25] More specifically, the unsuitable orbital composition in the conduction band of MoS 2 , including S 3p x,y and Mo 4d z 2 , possesses an unfavorable electron-interaction with H atoms and water molecules on account of improper orbital orientation, rendering the basal plane of MoS 2 become inert for HER. [23,26] Several strategies, such as hetero-atom doping, [27][28][29][30][31] phase and interface tuning, [32,33] and defect engineering [34] have been employed to untangle the above drawback. For instance, Duan and co-workers synthesized the active basal plane of MoS 2 by replacing some Mo atoms with Co, which induces long-range ferromagnetic order to activate S atoms. [35] Moreover, Zheng and the colleagues prepared an active and stable catalyst via co-confining Se in the surface and Co in the inner layer of MoS 2 . [36] They proved that the activating effect of Co with the stabilizing effect of Se enables the formation of abundant active sites in the basal plane and the edges of MoS 2 . Previously, our research group fabricated carbon-induced MoS 2 via a controlled sulfurization of Mo 2 C. [26] Experimental and theoretical analyses revealed that carbon effectively altered the electronic and coordination structures of MoS 2 through emptying 2p orbitals perpendicular to the basal plane, enabling energetically favorable water adsorption and dissociation. Besides, Xiong et al. synthetized a bifunctional catalyst by doping Co atoms into the MoS 2 matrix. [37] They demonstrated that Co doping not only dramatically enhances HER performance but also induces superior MoS 2 represents a promising catalyst for the hydrogen evolution reaction (HER) in water splitting, but the inefficient catalytic activity in a pH-universal environment is an obstacle to developing practical applications. Boosting and balancing the water dissociation and hydrogen desorption kinetics is crucial in designing high-performance catalysts for the overall pH range. Herein, it is experimentally demonstrated that cobalt single-atom doping can effectively construct a reactive CoMoS micro-environment on the basal...

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Molybdenum-promoted cobalt supported on SBA-15: Steam and sulfur dioxide stable catalyst for CO oxidation

Cited by 33 publications

References 106 publications

Non Noble-Metal Copper–Cobalt Bimetallic Catalyst for Efficient Catalysis of the Hydrogenolysis of 5-Hydroxymethylfurfural to 2,5-Dimethylfuran under Mild Conditions

Non Noble-Metal Copper–Cobalt Bimetallic Catalyst for Efficient Catalysis of the Hydrogenolysis of 5-Hydroxymethylfurfural to 2,5-Dimethylfuran under Mild Conditions

Efficient and Stable Co/β-Mo₂C Catalyst for Hydroformylation

Constructing Reactive Micro‐Environment in Basal Plane of MoS₂ for pH‐Universal Hydrogen Evolution Catalysis

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Molybdenum-promoted cobalt supported on SBA-15: Steam and sulfur dioxide stable catalyst for CO oxidation

Cited by 33 publications

References 106 publications

Non Noble-Metal Copper–Cobalt Bimetallic Catalyst for Efficient Catalysis of the Hydrogenolysis of 5-Hydroxymethylfurfural to 2,5-Dimethylfuran under Mild Conditions

Non Noble-Metal Copper–Cobalt Bimetallic Catalyst for Efficient Catalysis of the Hydrogenolysis of 5-Hydroxymethylfurfural to 2,5-Dimethylfuran under Mild Conditions

Efficient and Stable Co/β-Mo2C Catalyst for Hydroformylation

Constructing Reactive Micro‐Environment in Basal Plane of MoS2 for pH‐Universal Hydrogen Evolution Catalysis

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Efficient and Stable Co/β-Mo₂C Catalyst for Hydroformylation

Constructing Reactive Micro‐Environment in Basal Plane of MoS₂ for pH‐Universal Hydrogen Evolution Catalysis