Engineering pore morphology using silica template route over mesoporous cobalt oxide and its implications in atmospheric pressure carbon dioxide hydrogenation to olefins. (June 2020)

• Record Type: Journal Article
• Authors: Gupta, Sharad; Ciotonea, Carmen; Royer, Sébastien; Dacquin, Jean-Philippe; Vinod, C.P.
• Is Part Of: Applied materials today. Volume 19(2020)
• Publication Date: 2020-06
• Subjects: Silica hard template -- Mesoporous Co3O4 -- Pore morphology -- CO2 hydrogenation -- Olefin fraction; Materials science -- Periodicals; Materials -- Research -- Periodicals; 620.1105
• DOI: 10.1016/j.apmt.2020.100586
• Languages: English
• ISSNs: 2352-9407

Abstract

Graphical abstract: Highlights: 3D m-Co-KIT-6 and 2D m-Co-SBA-15 mesoporous Co3 O4 catalysts through hard template Superior CO2 hydrogenation activity under atmospheric pressure condition for 3D mesoporous Co3 O4 . Enhanced activity attributed to more active site, pore structure and lower mass diffusion limitations. 3D mesoporous Co3 O4 show selectivity for olefins compared to 2D mesoporous structure. Abstract: Highly ordered mesoporous cobalt oxides (denoted as m-Co-KIT-6 and m-Co-SBA-15) with three dimensional and two dimensional pore morphology respectively have been synthesized using 3D KIT-6, and 2D SBA-15 as silica template via nanocasting route. CO2 hydrogenation activity was evaluated for these mesoporous materials under atmospheric pressure conditions. In comparison to nanoparticles of cobalt oxide (Co3 O4 -nano), mesoporous catalysts showed excellent activity for CO2 hydrogenation due to their higher number of exposed active sites and lower mass diffusion limitations. The ordered mesoporous structure of Co3 O4 catalysts favored the chain growth of carbon atoms for the production of C2+ hydrocarbons while Co3 O4 nanoparticles showed strong selectivity toward CH4 . High selectivity for C2+ (∼ 25%) was obtained for both m-Co-KIT-6 and m-Co-SBA-15 catalysts at 320 °C. In addition, the 3D pore structure of m-Co-KIT-6 catalyst exclusively formed more olefins (54.9%) fraction.