In situ DRIFTS study of photocatalytic CO 2 reduction under UV irradiation

doi:10.1007/s11705-009-0232-3

Front. Chem. Sci. Eng.

2010, Vol. 4

Issue (2) : 120-126 https://doi.org/10.1007/s11705-009-0232-3

Research articles

In situ DRIFTS study of photocatalytic CO 2 reduction under UV irradiation

Jeffrey C. S. WU,Chao-Wei HUANG,

Department of Chemical Engineering, Taiwan University, Taipei 10617, China;

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Abstract Photocatalytic reduction of CO₂ on TiO₂ and Cu/TiO₂ photocatalysts was studied by in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) under UV irradiation. The photocatalysts were prepared by sol-gel method via controlled hydrolysis of titanium (IV) butoxide. Copper precursor was loaded onto TiO₂ during sol-gel procedure. A large amount of adsorbed H₂O and surface OH groups was detected at 25°C on the TiO₂ photocatalyst after being treated at 500°C under air stream. Carbonate and bicarbonate were formed rapidly due to the reaction of CO₂ with oxygen-vacancy and OH groups, respectively, on TiO₂ surface upon CO₂ adsorption. The IR spectra indicated that, under UV irradiation, gas-phase CO₂ further combined with oxygen-vacancy and OH groups to produce more carbonate or bicarbonate. The weak signals of reaction intermediates were found on the IR spectra, which were due to the slow photocatalytic CO₂ reduction on photocatalysts. Photogenerated electrons merge with H⁺ ions to form H atoms, which progressively reduce CO₂ to form formic acid, dioxymethylene, formaldehyde and methoxy as observed in the IR spectra. The well-dispersed Cu, acting as the active site significantly increases the amount of formaldehyde and dioxymethylene, thus promotes the photoactivity of CO₂ reduction on Cu/TiO₂. A possible mechanism of the photocatalytic CO₂ reduction is proposed based on these intermediates and products on the photocatalysts.

Issue Date: 05 June 2010

Cite this article:

Chao-Wei HUANG,Jeffrey C. S. WU. In situ DRIFTS study of photocatalytic CO 2 reduction under UV irradiation[J]. Front. Chem. Sci. Eng., 2010, 4(2): 120-126.

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https://academic.hep.com.cn/fcse/EN/10.1007/s11705-009-0232-3
https://academic.hep.com.cn/fcse/EN/Y2010/V4/I2/120

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