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An, Kwangjin
Advanced Nanocatalysis Lab (An Lab)
Research Interests
  • Nanoparticle catalytsts, catalytic activity, selectivity, and stability, strong metal-support interactions, CO2 utilization, biomass conversion, Plastic Up-cycling

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Evidence of Highly Active Cobalt Oxide Catalyst for the Fischer−Tropsch Synthesis and CO2 Hydrogenation

Cited 26 times inthomson ciCited 22 times inthomson ci
Title
Evidence of Highly Active Cobalt Oxide Catalyst for the Fischer−Tropsch Synthesis and CO2 Hydrogenation
Author
Melaet, GeromeRalston, Walter T.Li, Cheng-ShiuanAlayoglu, SelimAn, KwangjinMusselwhite, NathanKalkan, BoraSomorjai, Gabor A.
Keywords
SUPPORT
Issue Date
2014-02
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.136, no.6, pp.2260 - 2263
Abstract
Hydrogenations of CO or CO2 are important catalytic reactions as they are interesting alternatives to produce fine chemical feedstock hence avoiding the use of fossil sources. Using monodisperse nanoparticle (NP) catalysts, we have studied the CO/H2 (i.e., Fischer-Tropsch synthesis) and CO2/H2 reactions. Exploiting synchrotron based in situ characterization techniques such as XANES and XPS, we were able to demonstrate that 10 nm Co NPs cannot be reduced at 250 C while supported on TiO2 or SiO2 and that the complete reduction of cobalt can only be achieved at 450 C. Interestingly, cobalt oxide performs better than fully reduced cobalt when supported on TiO2. In fact, the catalytic results indicate an enhancement of 10-fold for the CO2/H2 reaction rate and 2-fold for the CO/H2 reaction rate for the Co/TiO2 treated at 250 C in H2 versus Co/TiO2 treated at 450 C. Inversely, the activity of cobalt supported on SiO2 has a higher turnover frequency when cobalt is metallic. The product distributions could be tuned depending on the support and the oxidation state of cobalt. For oxidized cobalt on TiO2, we observed an increase of methane production for the CO2/H2 reaction whereas it is more selective to unsaturated products for the CO/H2 reaction. In situ investigation of the catalysts indicated wetting of the TiO2 support by CoOx and partial encapsulation of metallic Co by TiO 2-x. © 2014 American Chemical Society.
URI
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DOI
10.1021/ja412447q
ISSN
0002-7863
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ECHE_Journal Papers
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