Role of catalyst carriers in CO2 photoreduction over nanocrystalline nickel loaded TiO2-based photocatalysts

Oluwafunmilola Opeyemi Ola, M Mercedes Maroto-Valer

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Nickel-based TiO2 photocatalysts were immobilized onto carriers (quartz plates and monoliths) in a unique reactor configuration to provide a high ratio of illuminated surface area of catalyst for the reduction in CO2 to fuels under UV and visible light. The incorporation of Ni2+ in the TiO2 matrix inhibits the grain growth of anatase crystallites and suppresses phase transformation. The Ni2+ atom is also found to be replacing some of the Ti atoms in the crystal lattice of TiO2 during the sol-gel method, thus causing a change in optical absorption. Using water as a reductant, vapour-phase CO2 was reduced to fuels with the monolith threaded with optical fibres and quartz plate photoreactor system following 4 h of light irradiation. More importantly, the improved conversion efficiency is ascribed to the presence of Ni2+ species which served as electrons traps that suppressed recombination, resulting in effective charge separation and CO2 reduction. (C) 2013 Elsevier Inc. All rights reserved.

Original languageEnglish
Pages (from-to)300-308
Number of pages9
JournalJournal of Catalysis
Volume309
DOIs
Publication statusPublished - Jan 2014

Keywords

  • Nickel Photocatalysis
  • Quartz plate
  • Monolith photoreactor
  • Titanium dioxide
  • Heterojunction
  • DOPED TITANIA
  • WATER-PURIFICATION
  • TIO2 NANOPARTICLES
  • REACTOR
  • LIGHT
  • IRRADIATION
  • REDUCTION
  • REACTIVITY
  • DIOXIDE
  • ENERGY

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