Selective photocatalytic reduction of CO2 by H2O/H2 to CH4 and CH3OH over Cu-promoted In2O3/TiO2 nanocatalyst

Tahir, Muhammad Nawaz; Tahir, Beenish; Amin, Nor Aishah Saidina; Alias, Hajar

doi:10.1016/j.apsusc.2016.06.155

Cited by 134 publications

(35 citation statements)

References 47 publications

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“…A certain agglomeration degree is observed when Cu loading is increased. This phenomenon has also been observed in earlier supercritical metal modified TiO 2 synthesis, when working with Pt and Pd, , and in traditional synthesis of Cu/TiO 2 , …”

Section: Resultssupporting

confidence: 79%

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: 79%

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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“…For the laser radiation, the maximum production yield achieved is 510 μmol g − 1 h − 1 after 40 min of irradiation, and the corresponding values for solar radiation and UV broadband are 130 μmol g − 1 h − 1 and 40 μmol g − 1 h − 1 , respectively, also after 40 min of irradiation. The methanol yield achieved by our catalyst is much higher than the reported values using Ag‐doped TiO 2 (1.5 wt% Ag), Ag‐doped AgCl, and Cu‐In 2 O 3 /TiO 2 with the methanol yields of 4.17 μmol g −1 h −1 , 38 μmol g −1 h −1 , and 40.63 μmol g −1 h −1 , respectively.…”

Section: Resultscontrasting

confidence: 59%

Photocatalytic conversion of CO₂ into methanol using graphitic carbon nitride under solar, UV laser and broadband radiations

et al. 2017

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Summary Photocatalytic conversion of carbon dioxide into methanol using highly efficient g‐C3N4, in conjunction with three different radiations (solar radiation, broad‐band ultraviolet (UV)–visible lamp, and laser beam) is presented. The optical, structural, and morphological properties of the synthesized g‐C3N4 were studied using advanced analytical techniques like Fourier transform infrared spectroscopy, UV–visible spectrometer, X‐ray diffraction, high‐resolution transmission electron microscopy, high‐angle annular dark field, and X‐ray photoelectron spectroscopy. The relative merits of the three sources of radiation in the presence of g‐C3N4 were studied in terms of key figures of merit of the photocatalytic process, namely, methanol production yield and quantum yield. As expected, after 40 min of irradiation, 355‐nm laser (40 mJ/pulse, 10 Hz) with g‐C3N4 rendered the best methanol production yield (510 μmol g−1 h−1), followed by solar radiation (130 μmol g−1 h−1), and UV broadband lamp. This indicates that the photon flux and the spectral properties of incident light are the key factors for the enhancement of methanol production yield. Although the methanol production yield with 355‐nm laser radiation is quite impressive because of the inherent high photon flux and the monochromatic nature of laser, the methanol yield of 130 μmol g−1 h−1 with natural sunlight is quite an important result, as it can be used for the development of large‐scale solar fuel generation facilities by harnessing the naturally abundant solar radiation. Copyright © 2017 John Wiley & Sons, Ltd.

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“…Among them, titanium dioxide (TiO 2 ) has been extensively investigated for photocatalytic CO 2 reduction because of its effectiveness, wide availability, chemical stability, and environmental friendliness . However, up to now, the photocatalytic performance of TiO 2 remains unsatisfactory mainly due to its low utilization efficiency of photogenerated electron–hole pairs . Therefore, it is of significance to improve the photocatalytic performance of TiO 2 from this aspect …”

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confidence: 99%

In Situ Irradiated X‐Ray Photoelectron Spectroscopy Investigation on a Direct Z‐Scheme TiO₂/CdS Composite Film Photocatalyst

et al. 2018

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Inspired by nature, artificial photosynthesis through the construction of direct Z‐scheme photocatalysts is extensively studied for sustainable solar fuel production due to the effectiveness in enhancing photoconversion efficiency. However, there is still a lack of thorough understanding and direct evidence for the direct Z‐scheme charge transfer in these photocatalysts. Herein, a recyclable direct Z‐scheme composite film composed of titanium dioxide and cadmium sulfide (TiO2/CdS) is prepared for high‐efficiency photocatalytic carbon dioxide (CO2) reduction. In situ irradiated X‐ray photoelectron spectroscopy (ISI‐XPS) confirms the direct Z‐scheme charge‐carrier migration pathway in the photocatalytic system. Furthermore, density functional theory simulation identifies the intrinsic cause for the formation of the direct Z‐scheme heterojunction between the TiO2 and the CdS. Thanks to the significantly enhanced redox abilities of the charge carriers in the direct Z‐scheme system, the photocatalytic CO2 reduction performance of the optimized TiO2/CdS is 3.5, 5.4, and 6.3 times higher than that of CdS, TiO2, and commercial TiO2 (P25), respectively, in terms of methane production. This work is a valuable guideline in preparation of highly efficient recyclable nanocomposite for photoconversion applications.

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Selective photocatalytic reduction of CO2 by H2O/H2 to CH4 and CH3OH over Cu-promoted In2O3/TiO2 nanocatalyst

Cited by 134 publications

References 47 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 conversion of CO₂ into methanol using graphitic carbon nitride under solar, UV laser and broadband radiations

In Situ Irradiated X‐Ray Photoelectron Spectroscopy Investigation on a Direct Z‐Scheme TiO₂/CdS Composite Film Photocatalyst

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Selective photocatalytic reduction of CO2 by H2O/H2 to CH4 and CH3OH over Cu-promoted In2O3/TiO2 nanocatalyst

Cited by 134 publications

References 47 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 conversion of CO2 into methanol using graphitic carbon nitride under solar, UV laser and broadband radiations

In Situ Irradiated X‐Ray Photoelectron Spectroscopy Investigation on a Direct Z‐Scheme TiO2/CdS Composite Film Photocatalyst

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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 conversion of CO₂ into methanol using graphitic carbon nitride under solar, UV laser and broadband radiations

In Situ Irradiated X‐Ray Photoelectron Spectroscopy Investigation on a Direct Z‐Scheme TiO₂/CdS Composite Film Photocatalyst