Effect of operating conditions and potassium content on Fischer-Tropsch liquid products produced by potassium-promoted iron catalysts

• Published in: Journal of natural gas chemistry Vol. 17; no. 2; pp. 175 - 178
• Main Authors: Farias, Francisco E.M., Sales, Fernando G., Fernandes, Fabiano A.N.
• Format: Journal Article
• Language: English
• Published: Chengdu Elsevier B.V 01.06.2008; Dalian Institute of Chemical Physics; Universidade Federal do Ceará, Departamento de Engenharia Química, Campus do Pici, Bloco 709, 60455-760 Fortaleza-CE, Brazil
• Subjects: Applied sciences; Energy; Exact sciences and technology; Fischer-Tropsch synthesis; Fischer-Tropsch合成; Fuel processing. Carbochemistry and petrochemistry; Fuels; iron-based catalyst; liquid fuels; Liquid petroleum product processing; potassium; 液态燃料; 钾助剂; 铁催化剂; Fischer-Tropsch synthesis; liquid fuels; potassium; iron-based catalyst; Alternative fuel; Liquid fuel; Fischer Tropsch synthesis; Synthetic fuel; Iron; Experimental study; Potassium; Catalyst; Operating conditions
• ISSN: 1003-9953
• DOI: 10.1016/S1003-9953(08)60047-X

The dependencies of Fischer-Tropsch synthesis liquid hydrocarbon product distribution on operating pressure and temperature have been studied over three potassium-promoted iron catalysts with increasing potassium molar content. The study followed an experimental planning and the results were analyzed based on surface response methodology. The effects of different operating conditions and potassium contents on the liquid product distribution were compared based on number average carbon number and dispersion. Results showed that high pressures （25 to 30 arm） favored the production of waxes that could be converted into liquid fuels through hydrocracking, while greater direct selectivity towards diesel was favored by low pressure （20 arm） using catalysts with low potassium to iron molar ratios. The liquid product distribution produced using an iron catalyst with high potassium content presented higher number-average number of carbons when compared to the distribution obtained using an iron catalyst with low potassium content.