Journal
APPLIED CATALYSIS A-GENERAL
Volume 523, Issue -, Pages 146-158Publisher
ELSEVIER
DOI: 10.1016/j.apcata.2016.05.024
Keywords
Fischer-Tropsch synthesis; Cobalt; Silica; Phosphorus; Promoter; EXAFS/XANES
Categories
Funding
- Commonwealth of Kentucky
- Canada Foundation for Innovation
- Natural Sciences and Engineering Research Council of Canada
- National Research Council Canada
- Canadian Institutes of Health Research
- Government of Saskatchewan
- Western Economic Diversification Canada
- University of Saskatchewan
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The effect of phosphorus addition on silica-supported cobalt catalyst was investigated for Fischer-Tropsch synthesis (FTS). As shown by STEM images and chemisorption, the addition of phosphorus to cobalt of up to 1 wt% increased the dispersion of cobalt. Further addition of phosphorus (e.g., 3 and 5 wt.%), as demonstrated by TPR, pulse reoxidation, and XANES, significantly hindered the reduction of cobalt oxides. The cobalt FTS catalysts containing 0.5 and 1.0 wt% P exhibited greater stability in comparison with undoped and 3.0 wt% P containing cobalt catalysts. Analysis of XANES spectra at the P and Co K-edges, along with DRIFTS results of H-2-activated cobalt catalysts, suggest that cobalt particles interact with PO43- ions, indicating a role played by P in anchoring Co particles to the support, thus hindering the cobalt sintering rate. The initial selectivity to methane was slightly higher for 0.5%P-20%Co/SiO2 and 1.0%P-20%Co/SiO2 catalysts compared to the undoped catalyst, but at longer times differences were small. At higher loadings of P (3 wt.%), FT activity and selectivity were adversely and irreversibly affected. (C) 2016 Elsevier B.V. All rights reserved.
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