Deactivation of Co-based Fischer-Tropsch catalyst by aerosol deposition of potassium salts

Gavrilovic, LjubisaNorwegian University of Science and Technology, Norway (författare)

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.

TEKNIK OCH TEKNOLOGIER Kemiteknik Kemiska processer hsv//swe
ENGINEERING AND TECHNOLOGY Chemical Engineering Chemical Process Engineering hsv//eng
Fischer-Tropsch
Biomass
Cobalt catalyst
Deactivation
Potassium
Bioenergiteknik/Energi- och Miljöteknik
Bioenergy Technology

Brandin, Jan,1958-Linnéuniversitetet,Institutionen för byggd miljö och energiteknik (BET)(Swepub:lnu)jbrbie (författare)
Holmen, AndersNorwegian University of Science and Technology, Norway (författare)
Venvik, HildeNorwegian University of Science and Technology, Norway (författare)
Myrstad, R.SINTEF Materials and Chemistry, Norway (författare)
Blekkan, EddNorwegian University of Science and Technology, Norway (författare)
Norwegian University of Science and Technology, NorwayInstitutionen för byggd miljö och energiteknik (BET) (creator_code:org_t)

Ingår i:Industrial & Engineering Chemistry ResearchWashington, USA : American Chemical Society (ACS)57:6, s. 1935-19420888-58851520-5045

Av författaren/redakt...: Gavrilovic, Ljub ...; Brandin, Jan, 19 ...; Holmen, Anders; Venvik, Hilde; Myrstad, R.; Blekkan, Edd

Om ämnet

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Kemiteknik; och Kemiska processe ...

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