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 journalArticlepeer-review

93 Citations (Scopus)


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 languageEnglish
Pages (from-to)244-252
Number of pages9
JournalApplied Surface Science
Publication statusPublished - Jul 30 2016
Externally publishedYes


  • 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


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