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Deactivation of Co-based Fischer-Tropsch catalyst by aerosol deposition of potassium salts
Norwegian University of Science and Technology, Norway.
Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.ORCID iD: 0000-0002-4162-3680
Norwegian University of Science and Technology, Norway.
Norwegian University of Science and Technology, Norway.
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2018 (English)In: Industrial & Engineering Chemistry Research, ISSN 0888-5885, E-ISSN 1520-5045, Vol. 57, no 6, p. 1935-1942Article in journal (Refereed) Published
Abstract [en]

A 20%Co/0.5%Re/γAl2O3 Fischer-Tropsch catalyst was poisoned by four potassium salts (KNO3, K2SO4, KCl, K2CO3) using the aerosol deposition technique, depositing up to 3500 ppm K as solid particles. Standard characterization techniques (H2 Chemisorption, BET, TPR) showed no difference between treated samples and their unpoisoned counterpart. The Fischer-Tropsch activity was investigated at industrially relevant conditions (210 °C, H2:CO = 2:1, 20 bar). The catalytic activity was significantly reduced for samples exposed to potassium, and the loss of activity was more severe with higher potassium loadings, regardless of the potassium salt used. A possible dual deactivation effect by potassium and the counter-ion (chloride, sulfate) is observed with the samples poisoned by KCl and K2SO4. The selectivity towards heavier hydrocarbons (C5+) was slightly increased with increasing potassium loading, while the CH4 selectivity was reduced for all the treated samples. The results support the idea that potassium is mobile under FT conditions. The loss of activity was described by simple deactivation models which imply a strong non-selective poisoning by the potassium species.

Place, publisher, year, edition, pages
Washington, USA: American Chemical Society (ACS), 2018. Vol. 57, no 6, p. 1935-1942
Keywords [en]
Fischer-Tropsch, Biomass, Cobalt catalyst, Deactivation, Potassium
National Category
Chemical Process Engineering
Research subject
Technology (byts ev till Engineering), Bioenergy Technology
Identifiers
URN: urn:nbn:se:lnu:diva-70199DOI: 10.1021/acs.iecr.7b04498ISI: 000425473900017OAI: oai:DiVA.org:lnu-70199DiVA, id: diva2:1178183
Available from: 2018-01-29 Created: 2018-01-29 Last updated: 2018-03-09Bibliographically approved

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Brandin, Jan

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