Ethanol and methanol steam reforming on transition metal catalysts supported on detonation synthesis nanodiamonds for hydrogen production

Mironova, E. Yu.; Лыткина, А. А.; Ермилова, М. М.; Ефимов, М. Н.; Zemtsov, L. M.; Орехова, Н. В.; Карпачева, Г. П.; Bondarenko, G. N.; Muraviev, Dmitri; Yaroslavtsev, A. B.

doi:10.1016/j.ijhydene.2014.11.082

Cited by 52 publications

(16 citation statements)

References 37 publications

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“…The band at 1755 cm −1 gradually increases with the extension of irradiation time, which corresponds to the vibration related with acetaldehyde molecule [46]. This is consistent with the increased acetaldehyde production in liquid phase with the reaction.…”

Section: Figuresupporting

confidence: 76%

“…The band at around 2350 cm −1 , assigned to the vibration of CO2 [47], does not appear in the FTIR spectra. This verifies that the C-C cleavage of ethanol is greatly inhibited on the three Au- The band at 1755 cm −1 gradually increases with the extension of irradiation time, which corresponds to the vibration related with acetaldehyde molecule [46]. This is consistent with the increased acetaldehyde production in liquid phase with the reaction.…”

Section: Figuresupporting

confidence: 76%

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Enhanced Hydrogen Production from Ethanol Photoreforming by Site-Specific Deposition of Au on Cu2O/TiO2 p-n Junction

Luo

Zhang

et al. 2020

Catalysts

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Hydrogen production by photoreforming of biomass-derived ethanol is a renewable way of obtaining clean fuel. We developed a site-specific deposition strategy to construct supported Au catalysts by rationally constructing Ti3+ defects inTiO2 nanorods and Cu2O-TiO2 p-n junction across the interface of two components. The Au nanoparticles (~2.5 nm) were selectively anchored onto either TiO2 nanorods (Au@TiO2/Cu2O) or Cu2O nanocubes (Au@Cu2O/TiO2) or both TiO2 and Cu2O (Au@TiO2/Cu2O@Au) with the same Au loading. The electronic structure of supported Au species was changed by forming Au@TiO2 interface due to the adjacent Ti3+ defects and the associated oxygen vacancies while unchanged in Au@Cu2O/TiO2 catalyst. The p-n junction of TiO2/Cu2O promoted charge separation and transfer across the junction. During ethanol photoreforming, Au@TiO2/Cu2O catalyst possessing both the Au@TiO2 interface and the p-n junction showed the highest H2 production rate of 8548 μmol gcat−1 h−1 under simulated solar light, apparently superior to both Au@TiO2 and Au@Cu2O/TiO2 catalyst. The acetaldehyde was produced in liquid phase at an almost stoichiometric rate, and C−C cleavage of ethanol molecules to form CH4 or CO2 was greatly inhibited. Extensive spectroscopic results support the claim that Au adjacent to surface Ti3+ defects could be active sites for H2 production and p-n junction of TiO2/Cu2O facilitates photo-generated charge transfer and further dehydrogenation of ethanol to acetaldehyde during the photoreforming.

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Section: Figuresupporting

confidence: 76%

Section: Figuresupporting

confidence: 76%

Enhanced Hydrogen Production from Ethanol Photoreforming by Site-Specific Deposition of Au on Cu2O/TiO2 p-n Junction

Luo

Zhang

et al. 2020

Catalysts

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“…A considerable advantage is the significantly lower alcohol steam reforming process temperature. Even the catalytic reforming of ethanol proceeds at the temperatures of 400-500 • C [16]. In case of methanol In accordance with thermodynamics, reaction (1) dominates at low temperatures that in many cases make it possible to obtain products with low CO content.…”

Section: Introductionmentioning

confidence: 86%

“…There is also information about the carbon supports use, in particular nanodiamonds. Their activity is primarily determined by the oxygen-containing groups (OH, CO, COOH) located on the surface [16,34]. However, oxide carriers are more commonly used.…”

Section: Introductionmentioning

confidence: 99%

Methanol Steam Reforming on Bimetallic Catalysts Based on In and Nb Doped Titania or Zirconia: A Support Effect

2021

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Methanol steam reforming (MSR) is considered an effective method for hydrogen storage and to generate high-quality hydrogen for fuel cells. In this work, a comprehensive investigation of the methanol steam reforming process using a bimetallic Pt–Rh and Cu–Ni based on different oxide supports is presented. Highly dispersed titania and zirconia doped with indium and niobium ions were synthesized by sol–gel method. The effect of the nature and quantity of the dopant cation (In, Nb) on the catalytic performance of titania supported metal catalysts was investigated. The conclusions obtained show a significant effect of both the metal alloy and the oxide support nature on the activity and selectivity of the methanol steam reforming process. Pt–Rh alloy catalyst shows higher hydrogen yield, but its selectivity in the MSR process is lower than for the catalysts containing the Cu0.8-Ni0.2 alloy. Heterovalent indium doping of titania leads to the catalytic activity increase. It was suggested that this is due to the defects formation in the oxygen TiO2 sublattice. On the contrary, the use of niobium oxide as a dopant decreases the catalyst activity in the methanol steam reforming process but leads to the selectivity increase in the studied process.

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“…This reaction can be catalyzed by composite oxides, clays, etc. H 2 and CO 2 are generated under catalysis 20,21 . Therefore, the viscosity reduction efficiency of the heavy oil under hydrothermal cracking reaction can be improved by constructing a heavy oil–water‐alcohol hydrogen‐rich reaction system.…”

Section: Introductionmentioning

confidence: 99%

Enhanced aquathermolysis of heavy oil catalysed by bentonite supportedFe(III)complex in the present of ethanol

Zhang

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND Previous research on the aquathermolysis of heavy oil has ignored the relationship between exogenous catalysts and in‐situ inorganic minerals when the reaction temperature is high. RESULTS A series of bentonite‐supported transition metal complexes was synthesized and used in the aquathermolysis of heavy oil; among them, B@Fe(III)L was the most effective one. Under optimal conditions, 0.5% catalyst and 10% ethanol reacted at 250 °С for 4 h can reduce the viscosity of heavy oil by 84.5%. elemental analysis (EL), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), group composition, and analysis show that the catalyst enhances the destruction process of resin and asphaltene, promotes the more complete cracking reaction of most macromolecular components, and increases the proportion of light fraction of heavy oil. Gas chromatography–mass spectrometry (GC–MS) analysis also indicated that B@Fe(III)L can help to decrease the polar substances in heavy oil and reduce the aromaticity of polar substances. CONCLUSION The B@Fe(III)L prepared can enhance the destruction process of resin and asphaltene, promote the more complete cracking reaction of most macromolecular components, and increase the proportion of light fraction of heavy oil, thereby reducing the viscosity of heavy oil. Therefore, B@Fe(III)L can achieve efficient in‐situ viscosity reduction, and this work promotes related research and applications in this field. © 2021 Society of Chemical Industry (SCI).

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Ethanol and methanol steam reforming on transition metal catalysts supported on detonation synthesis nanodiamonds for hydrogen production

Cited by 52 publications

References 37 publications

Enhanced Hydrogen Production from Ethanol Photoreforming by Site-Specific Deposition of Au on Cu2O/TiO2 p-n Junction

Enhanced Hydrogen Production from Ethanol Photoreforming by Site-Specific Deposition of Au on Cu2O/TiO2 p-n Junction

Methanol Steam Reforming on Bimetallic Catalysts Based on In and Nb Doped Titania or Zirconia: A Support Effect

Enhanced aquathermolysis of heavy oil catalysed by bentonite supportedFe(III)complex in the present of ethanol

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