Efficient approach for simultaneous CO and H2 production via photoreduction of CO2 with water over copper nanoparticles loaded TiO2

Singhal, Nikita; Ali, Asgar; Vorontsov, Alexander V.; Pendem, Chandrashekar; Kumar, Umesh

doi:10.1016/j.apcata.2016.05.027

Cited by 56 publications

(29 citation statements)

References 53 publications

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“…The size distribution of Cu size is relatively narrow for both catalysts, being the average particle size diameter 6.6 nm for Cu 1 wt% and 10.1 nm for Cu 3 wt%. Metal sizes are bigger than Pt and Pd nanoparticles obtained in previous work,, although they are consistent with those reported for Cu/TiO 2 catalysts synthesized by traditional methods , , …”

Section: Resultssupporting

confidence: 91%

“…Although some authors, suggest that increasing copper concentration promotes sintering process, increasing crystallite size and decreasing BET area, in view of the XRD results described below (no change in crystallinity with metal loading), we prefer to explain this trend in terms of a partial coverage of TiO 2 by metal species . Some works dealing with traditional synthesis of Cu/TiO 2 (solvo‐thermal) do not report any change in BET area with variable metal concentrations , …”

Section: Resultsmentioning

confidence: 82%

“…These Cu species nanoparticles are also crystalline in nature . It is also noted that bigger Cu species nanoparticles are formed by agglomeration of smaller nanoparticles . Moreover, the TiO 2 and Cu nanoparticles are well connected, which facilitates charge transfer .…”

Section: Resultsmentioning

confidence: 97%

“…The first two correspond with TiO 2 . Regarding the chemical states of copper, the peak at 932.1 eV belongs to 2p 3/2 of Cu 2+ in CuO and a broad satellite peak of weak intensity at 940‐943 eV and the 2p 1/2 peak at 952.0 eV are also characteristic of Cu 2+ species . There is also a smaller peak at 930.9 eV belonging to Cu + in Cu 2 O.…”

Section: Resultsmentioning

confidence: 99%

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Improving the photo‐reduction of CO₂ to fuels with catalysts synthesized under high pressure: Cu/TiO₂

Camarillo

Tostón

Martínez

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND In previous studies the enhanced activity of TiO2‐based catalysts synthesized in supercritical medium for photocatalytic reduction of CO2 was proved. RESULTS In this study, Cu/TiO2 photocatalysts were synthesized by hydrothermal methods in supercritical CO2. Two titanium precursors [titanium tetraisopropoxide and diisopropoxititanium bis(acetylacetonate)], two alcohols (ethanol and isopropyl alcohol), and one metal precursor (Cu (II) acetylacetonate) were used in the synthesis. Catalysts produced showed improved properties in comparison with the commercial reference catalyst (Degussa P‐25, Evonik). CONCLUSIONS Specifically, it has been found that Cu/TiO2 catalysts may yield methane production rates 20 times larger than that of commercial TiO2 catalyst without diminishing CO production rate (about 5 times higher than that of commercial catalyst). This result has been mainly imputed to both the formation of oxygen vacancies during the synthesis in supercritical medium and the high capacity of copper to adsorb and activate CO2 molecules, while preventing CO molecules from reoxidation, and avoiding the competitive reaction of hydrogen formation. © 2017 Society of Chemical Industry

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Improving the photo‐reduction of CO₂ to fuels with catalysts synthesized under high pressure: Cu/TiO₂

Camarillo

Tostón

Martínez

et al. 2017

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

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“…Due to its long history as an active heterogeneous catalyst for industrial methanol synthesis and the water–gas shift reaction (WGSR), copper (Cu) is a promising candidate. Singhal et al . used oxidized (calcination in air) and reduced (calcination in H 2 ) Cu species on anatase TiO 2 with different loadings, and got CO and H 2 as products under H 2 O environment and UV‐C irradiation.…”

Section: Part Ii: Metal‐modified Tio2mentioning

confidence: 99%

Photocatalytic CO₂ Reduction on TiO₂‐Based Materials under Controlled Reaction Conditions: Systematic Insights from a Literature Study

Moustakas

Strunk

2018

Chemistry A European J

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Photocatalytic CO conversion to hydrocarbons (sometimes referred to as 'artificial photosynthesis'), which mimics natural photosynthesis with purely inorganic photocatalysts, has the potential to simultaneously combat the energy crisis and the greenhouse effect. In more than half of all reported studies to date, TiO -based materials are used as the photocatalyst. Yet, the reaction conditions and reactor designs employed in previous studies cover a vast range, hindering mutual comparisons of observed activities and selectivity. In this work, a systematic literature study is attempted, including a selection of only such research publications which report experimental conditions of high purity and a proof of the carbon source (blank experiments, CO isotope labelling or stoichiometric O identification) for CO photoreduction. General trends were then detected and discussed, aiming to guide future research to more efficient photocatalytic systems.

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Photocatalytic water splitting with noble‐metal free cocatalysts for a comprehensive study of two nonidentical photoreactors designs

Vicentini

Manieri

Subtil

et al. 2020

Env Prog and Sustain Energy

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Here, the authors (i) discuss the most prominent co‐catalyst for H2 generation structured in the form of Me‐TiO2/MCM‐41 (Me: Ag, Co, Cu, Ni) based on structural, electronic, textural, morphological and optical characterization techniques, such as XRD, wide and small angle, XPS, Fourier‐transform infrared spectroscopy, scanning electron microscopy, B.E.T., textural analysis, photoacoustic spectroscopy and photoluminescence spectroscopy; and (ii) evaluate the difference in hydrogen production in two distinct geometric reactors based on a theoretical study of light distribution inside the reactors supported by the experimental quantum yield calculation. As a result, copper‐doped photocatalyst generated higher hydrogen amount compared to the others. The high photocatalyst performance was due to the greater lamp spectrum absorption, marked by the low bandgap value, and high photoactivity justified by the low rate of electronic recombination. The hydrogen generation in the quartz reactor was seven times higher than the annular one, and when at maximum light power, it is comparable to the most sophisticated reaction systems found in literature. The larger light exposure area per unit volume of the quartz reactor compared to the annular one is the reason why it obtained better results due to the lower emitted photon blockade, with a 1.81% apparent quantum yield.

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Efficient approach for simultaneous CO and H2 production via photoreduction of CO2 with water over copper nanoparticles loaded TiO2

Cited by 56 publications

References 53 publications

Improving the photo‐reduction of CO₂ to fuels with catalysts synthesized under high pressure: Cu/TiO₂

Improving the photo‐reduction of CO₂ to fuels with catalysts synthesized under high pressure: Cu/TiO₂

Photocatalytic CO₂ Reduction on TiO₂‐Based Materials under Controlled Reaction Conditions: Systematic Insights from a Literature Study

Photocatalytic water splitting with noble‐metal free cocatalysts for a comprehensive study of two nonidentical photoreactors designs

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Efficient approach for simultaneous CO and H2 production via photoreduction of CO2 with water over copper nanoparticles loaded TiO2

Cited by 56 publications

References 53 publications

Improving the photo‐reduction of CO2 to fuels with catalysts synthesized under high pressure: Cu/TiO2

Improving the photo‐reduction of CO2 to fuels with catalysts synthesized under high pressure: Cu/TiO2

Photocatalytic CO2 Reduction on TiO2‐Based Materials under Controlled Reaction Conditions: Systematic Insights from a Literature Study

Photocatalytic water splitting with noble‐metal free cocatalysts for a comprehensive study of two nonidentical photoreactors designs

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Improving the photo‐reduction of CO₂ to fuels with catalysts synthesized under high pressure: Cu/TiO₂

Improving the photo‐reduction of CO₂ to fuels with catalysts synthesized under high pressure: Cu/TiO₂

Photocatalytic CO₂ Reduction on TiO₂‐Based Materials under Controlled Reaction Conditions: Systematic Insights from a Literature Study