Influence of sucrose addition and acid treatment of silica-supported Co-Ru catalysts for Fischer-Tropsch synthesis

•Sucrose addition and acid treatment modified catalyst properties and performance.•A synergistic effect was provided by sucrose addition and acid treatment.•The longest treatments increased Co crystal size.•Both modifications enhanced the catalyst activity and the C5+ selectivity.•The 2 h treated ca...

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Bibliographic Details
Published in:Fuel (Guildford) 2018-11, Vol.231, p.157-164
Main Authors: Ribeiro, André T.S., Bezerra, Victor V.L., Bartolomeu, Rodrigo A.C., Abreu, Cesar A.M., Filho, Nelson M.L., Silva, Antônio O.S., Maranhão, Laísse C.A., Merino, David, Sanz, Oihane, Montes, Mario, Machado, Giovanna, Almeida, Luciano C.
Format: Article
Language:English
Subjects:
Acid treatment
Acids
Catalysis
Catalysts
Chelating agents
Chelating compounds
Chelation
Chemical synthesis
Chemisorption
Co-based catalysts
Cobalt
Fischer-Tropsch process
Fischer-Tropsch synthesis
Fixed beds
Hydrocarbons
Organic chemistry
Reagents
Silica
Silicon dioxide
Sucrose
Sugar
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Summary:•Sucrose addition and acid treatment modified catalyst properties and performance.•A synergistic effect was provided by sucrose addition and acid treatment.•The longest treatments increased Co crystal size.•Both modifications enhanced the catalyst activity and the C5+ selectivity.•The 2 h treated catalysts showed higher C5+ selectivity than the other catalysts. This article highlights the formulation and evaluation of Co-Ru catalysts on silica used in Fischer-Tropsch synthesis. An acid treatment of the support associated with the addition of sucrose as a chelating agent was employed. The six formulated catalytic systems were characterized (TG, XRD, N2 adsorption, H2-TPR, H2 chemisorption) and evaluated in a fixed bed tubular reactor (H2/CO:2:1, 2 MPa, space velocity 4.5 × 10−2 LN.gcat−1·h−1) at five different temperatures (185 °C, 200 °C, 215 °C, 230 °C, 260 °C). The combination of both methods enhanced the cobalt dispersion, which is accompanied by an increase in C5+ hydrocarbon productivity. However, an optimum acid treatment is required to avoid large cobalt particle formation that leads to low CO conversion.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2018.05.064