Dynamic photocatalytic reduction of CO                         2                          to CO in a honeycomb monolith reactor loaded with Cu and N doped TiO                         2                          nanocatalysts

Muhammad Tahir; Beenish Tahir

doi:10.1016/j.apsusc.2016.03.141

Dynamic photocatalytic reduction of CO ₂ to CO in a honeycomb monolith reactor loaded with Cu and N doped TiO ₂ nanocatalysts

Muhammad Tahir, Beenish Tahir

Research output: Contribution to journal › Article › peer-review

98 Citations (Scopus)

Abstract

Cordierite honeycomb monoliths loaded with N/TiO ₂ and Cu/TiO ₂ nanocatalysts for dynamic photocatalytic CO ₂ reduction with H ₂ to CO in a continuous photoreactor illuminated with UV-light irradiations have been investigated. The nanocatalysts, loaded over the monoliths channels using sol-gel dip-coating method, were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), N ₂ adsorption-desorption, X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance and photoluminescence (PL) analysis. Crystalline and anatase TiO ₂ structure with nanoparticles evenly supported over the cordierite monolith channels were observed. Cu and N presented over TiO ₂ , shifted band gap energy towards visible region and hindered charges recombination rate. Loading Cu and N greatly improved TiO ₂ photoactivity for dynamic CO ₂ reduction to CO. Due to high photoactivity and selectivity, Cu/TiO ₂ assisted system yielded 14 times higher CO than the N/TiO ₂ and 64 times the amount of copper observed over pure TiO ₂ in a continuous operation of photoreactor. This significant improvement in Cu/TiO ₂ activity was noticeable due to efficient trapping and transport of electrons by Cu-metal. With unique properties, N/TiO ₂ showed good activity for continuous CO ₂ reduction to CH ₄ . In addition, a photocatalytic reaction mechanism is proposed to understand the experimental results over Cu and N modified TiO ₂ catalysts in a continuous operation of photoreactor.

Original language	English
Pages (from-to)	244-252
Number of pages	9
Journal	Applied Surface Science
Volume	377
DOIs	https://doi.org/10.1016/j.apsusc.2016.03.141
Publication status	Published - Jul 30 2016
Externally published	Yes

Keywords

Continuous operation
Cordierite honeycomb monolith
Cu-N doping
Dynamic CO reduction
H reductant

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
General Physics and Astronomy
Surfaces and Interfaces
Surfaces, Coatings and Films

Access to Document

10.1016/j.apsusc.2016.03.141

Cite this

Tahir, M., & Tahir, B. (2016). Dynamic photocatalytic reduction of CO ₂ to CO in a honeycomb monolith reactor loaded with Cu and N doped TiO ₂ nanocatalysts Applied Surface Science, 377, 244-252. https://doi.org/10.1016/j.apsusc.2016.03.141

Dynamic photocatalytic reduction of CO ₂ to CO in a honeycomb monolith reactor loaded with Cu and N doped TiO ₂ nanocatalysts . / Tahir, Muhammad; Tahir, Beenish.
In: Applied Surface Science, Vol. 377, 30.07.2016, p. 244-252.

Research output: Contribution to journal › Article › peer-review

Tahir, M & Tahir, B 2016, ' Dynamic photocatalytic reduction of CO ₂ to CO in a honeycomb monolith reactor loaded with Cu and N doped TiO ₂ nanocatalysts ', Applied Surface Science, vol. 377, pp. 244-252. https://doi.org/10.1016/j.apsusc.2016.03.141

Tahir M, Tahir B. Dynamic photocatalytic reduction of CO ₂ to CO in a honeycomb monolith reactor loaded with Cu and N doped TiO ₂ nanocatalysts Applied Surface Science. 2016 Jul 30;377:244-252. doi: 10.1016/j.apsusc.2016.03.141

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title = " Dynamic photocatalytic reduction of CO 2 to CO in a honeycomb monolith reactor loaded with Cu and N doped TiO 2 nanocatalysts ",

abstract = " Cordierite honeycomb monoliths loaded with N/TiO 2 and Cu/TiO 2 nanocatalysts for dynamic photocatalytic CO 2 reduction with H 2 to CO in a continuous photoreactor illuminated with UV-light irradiations have been investigated. The nanocatalysts, loaded over the monoliths channels using sol-gel dip-coating method, were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), N 2 adsorption-desorption, X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance and photoluminescence (PL) analysis. Crystalline and anatase TiO 2 structure with nanoparticles evenly supported over the cordierite monolith channels were observed. Cu and N presented over TiO 2 , shifted band gap energy towards visible region and hindered charges recombination rate. Loading Cu and N greatly improved TiO 2 photoactivity for dynamic CO 2 reduction to CO. Due to high photoactivity and selectivity, Cu/TiO 2 assisted system yielded 14 times higher CO than the N/TiO 2 and 64 times the amount of copper observed over pure TiO 2 in a continuous operation of photoreactor. This significant improvement in Cu/TiO 2 activity was noticeable due to efficient trapping and transport of electrons by Cu-metal. With unique properties, N/TiO 2 showed good activity for continuous CO 2 reduction to CH 4 . In addition, a photocatalytic reaction mechanism is proposed to understand the experimental results over Cu and N modified TiO 2 catalysts in a continuous operation of photoreactor.",

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AB - Cordierite honeycomb monoliths loaded with N/TiO 2 and Cu/TiO 2 nanocatalysts for dynamic photocatalytic CO 2 reduction with H 2 to CO in a continuous photoreactor illuminated with UV-light irradiations have been investigated. The nanocatalysts, loaded over the monoliths channels using sol-gel dip-coating method, were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), N 2 adsorption-desorption, X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance and photoluminescence (PL) analysis. Crystalline and anatase TiO 2 structure with nanoparticles evenly supported over the cordierite monolith channels were observed. Cu and N presented over TiO 2 , shifted band gap energy towards visible region and hindered charges recombination rate. Loading Cu and N greatly improved TiO 2 photoactivity for dynamic CO 2 reduction to CO. Due to high photoactivity and selectivity, Cu/TiO 2 assisted system yielded 14 times higher CO than the N/TiO 2 and 64 times the amount of copper observed over pure TiO 2 in a continuous operation of photoreactor. This significant improvement in Cu/TiO 2 activity was noticeable due to efficient trapping and transport of electrons by Cu-metal. With unique properties, N/TiO 2 showed good activity for continuous CO 2 reduction to CH 4 . In addition, a photocatalytic reaction mechanism is proposed to understand the experimental results over Cu and N modified TiO 2 catalysts in a continuous operation of photoreactor.

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