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

Ola, Oluwafunmilola; Mercedes Maroto-Valer, M.

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.

Citation

Ola, O., & Mercedes Maroto-Valer, M. (2014). Role of catalyst carriers in CO2 photoreduction over nanocrystalline nickel loaded TiO2-based photocatalysts. Journal of Catalysis, 309, 300-308. https://doi.org/10.1016/j.jcat.2013.10.016

• Journal Article Type: Article
• Acceptance Date: Oct 16, 2013
• Online Publication Date: Nov 13, 2013
• Publication Date: 2014-01
• Deposit Date: May 4, 2020
• Journal: Journal of Catalysis
• Print ISSN: 0021-9517
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 309
• Pages: 300-308
• DOI: https://doi.org/10.1016/j.jcat.2013.10.016
• Keywords: Physical and Theoretical Chemistry; Catalysis
• Public URL: https://nottingham-repository.worktribe.com/output/4380449
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0021951713003679
• Additional Information: This article is maintained by: Elsevier; Article Title: Role of catalyst carriers in CO2 photoreduction over nanocrystalline nickel loaded TiO2-based photocatalysts; Journal Title: Journal of Catalysis; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.jcat.2013.10.016; Content Type: article; Copyright: Copyright © 2013 Elsevier Inc. All rights reserved.