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Open AccessArticle

Effect of Operating Temperature, Pressure and Potassium Loading on the Performance of Silica-Supported Cobalt Catalyst in CO2 Hydrogenation to Hydrocarbon Fuel

Department of Chemical Engineering, Doornfontein Campus, University of Johannesburg, Doornfontein 2028, Johannesburg, South Africa
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Catalysts 2019, 9(10), 807; https://doi.org/10.3390/catal9100807
Received: 31 August 2019 / Revised: 9 September 2019 / Accepted: 10 September 2019 / Published: 26 September 2019
(This article belongs to the Special Issue Iron and Cobalt Catalysts)
Potassium (1–5 wt.%)-promoted and unpromoted Co/SiO2 catalysts were prepared by impregnation method and characterized by nitrogen physisorption, temperature-programmed reduction (TPR), CO2 temperature-programmed desorption (TPD), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) techniques. They were evaluated for CO2 hydrogenation in a fixed bed reactor from 180 to 300 °C within a pressure range of 1–20 bar. The yield for hydrocarbon products other than methane (C2+) was found to increase with an increase in the operating temperature and went through a maximum of approximately 270 °C. It did not show any significant dependency on the operating pressure and decreased at potassium loadings beyond 1 wt.%. Potassium was found to enhance the catalyst ability to adsorb CO2, but limited the reduction of cobalt species during the activation process. The improved CO2 adsorption resulted in a decrease in surface H/C ratio, the latter of which enhanced the formation of C2+ hydrocarbons. The highest C2+ yield was obtained on the catalyst promoted with 1 wt.% of potassium and operated at an optimal temperature of 270 °C and a pressure of 1 bar. View Full-Text
Keywords: CO2 hydrogenation; cobalt; potassium; pressure; temperature CO2 hydrogenation; cobalt; potassium; pressure; temperature
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Iloy, R.A.; Jalama, K. Effect of Operating Temperature, Pressure and Potassium Loading on the Performance of Silica-Supported Cobalt Catalyst in CO2 Hydrogenation to Hydrocarbon Fuel. Catalysts 2019, 9, 807.

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