Dynamic photocatalytic reduction of CO2 to CO in a honeycomb monolith reactor loaded with Cu and N doped TiO2 nanocatalysts
Cordierite honeycomb monoliths loaded with N/TiO2 and Cu/TiO2 nanocatalysts for dynamic photocatalytic CO2 reduction with H2 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-coati...
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| Format: | Article |
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Elsevier B.V.
2016
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| _version_ | 1796861907146113024 |
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| author | Tahir, M. Tahir, B. |
| author_facet | Tahir, M. Tahir, B. |
| author_sort | Tahir, M. |
| collection | ePrints |
| description | Cordierite honeycomb monoliths loaded with N/TiO2 and Cu/TiO2 nanocatalysts for dynamic photocatalytic CO2 reduction with H2 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), N2 adsorption-desorption, X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance and photoluminescence (PL) analysis. Crystalline and anatase TiO2 structure with nanoparticles evenly supported over the cordierite monolith channels were observed. Cu and N presented over TiO2, shifted band gap energy towards visible region and hindered charges recombination rate. Loading Cu and N greatly improved TiO2 photoactivity for dynamic CO2 reduction to CO. Due to high photoactivity and selectivity, Cu/TiO2 assisted system yielded 14 times higher CO than the N/TiO2 and 64 times the amount of copper observed over pure TiO2 in a continuous operation of photoreactor. This significant improvement in Cu/TiO2 activity was noticeable due to efficient trapping and transport of electrons by Cu-metal. With unique properties, N/TiO2 showed good activity for continuous CO2 reduction to CH4. In addition, a photocatalytic reaction mechanism is proposed to understand the experimental results over Cu and N modified TiO2 catalysts in a continuous operation of photoreactor. |
| first_indexed | 2024-03-05T20:03:31Z |
| format | Article |
| id | utm.eprints-72292 |
| institution | Universiti Teknologi Malaysia - ePrints |
| last_indexed | 2024-03-05T20:03:31Z |
| publishDate | 2016 |
| publisher | Elsevier B.V. |
| record_format | dspace |
| spelling | utm.eprints-722922017-11-20T08:18:53Z http://eprints.utm.my/72292/ Dynamic photocatalytic reduction of CO2 to CO in a honeycomb monolith reactor loaded with Cu and N doped TiO2 nanocatalysts Tahir, M. Tahir, B. TP Chemical technology Cordierite honeycomb monoliths loaded with N/TiO2 and Cu/TiO2 nanocatalysts for dynamic photocatalytic CO2 reduction with H2 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), N2 adsorption-desorption, X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance and photoluminescence (PL) analysis. Crystalline and anatase TiO2 structure with nanoparticles evenly supported over the cordierite monolith channels were observed. Cu and N presented over TiO2, shifted band gap energy towards visible region and hindered charges recombination rate. Loading Cu and N greatly improved TiO2 photoactivity for dynamic CO2 reduction to CO. Due to high photoactivity and selectivity, Cu/TiO2 assisted system yielded 14 times higher CO than the N/TiO2 and 64 times the amount of copper observed over pure TiO2 in a continuous operation of photoreactor. This significant improvement in Cu/TiO2 activity was noticeable due to efficient trapping and transport of electrons by Cu-metal. With unique properties, N/TiO2 showed good activity for continuous CO2 reduction to CH4. In addition, a photocatalytic reaction mechanism is proposed to understand the experimental results over Cu and N modified TiO2 catalysts in a continuous operation of photoreactor. Elsevier B.V. 2016 Article PeerReviewed Tahir, M. and Tahir, B. (2016) Dynamic photocatalytic reduction of CO2 to CO in a honeycomb monolith reactor loaded with Cu and N doped TiO2 nanocatalysts. Applied Surface Science, 377 . pp. 244-252. ISSN 0169-4332 https://www.scopus.com/inward/record.uri?eid=2-s2.0-84962469026&doi=10.1016%2fj.apsusc.2016.03.141&partnerID=40&md5=6aebb6673286d61b6404d8faa8df82ea |
| spellingShingle | TP Chemical technology Tahir, M. Tahir, B. Dynamic photocatalytic reduction of CO2 to CO in a honeycomb monolith reactor loaded with Cu and N doped TiO2 nanocatalysts |
| title | Dynamic photocatalytic reduction of CO2 to CO in a honeycomb monolith reactor loaded with Cu and N doped TiO2 nanocatalysts |
| title_full | Dynamic photocatalytic reduction of CO2 to CO in a honeycomb monolith reactor loaded with Cu and N doped TiO2 nanocatalysts |
| title_fullStr | Dynamic photocatalytic reduction of CO2 to CO in a honeycomb monolith reactor loaded with Cu and N doped TiO2 nanocatalysts |
| title_full_unstemmed | Dynamic photocatalytic reduction of CO2 to CO in a honeycomb monolith reactor loaded with Cu and N doped TiO2 nanocatalysts |
| title_short | Dynamic photocatalytic reduction of CO2 to CO in a honeycomb monolith reactor loaded with Cu and N doped TiO2 nanocatalysts |
| title_sort | dynamic photocatalytic reduction of co2 to co in a honeycomb monolith reactor loaded with cu and n doped tio2 nanocatalysts |
| topic | TP Chemical technology |
| work_keys_str_mv | AT tahirm dynamicphotocatalyticreductionofco2tocoinahoneycombmonolithreactorloadedwithcuandndopedtio2nanocatalysts AT tahirb dynamicphotocatalyticreductionofco2tocoinahoneycombmonolithreactorloadedwithcuandndopedtio2nanocatalysts |