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Low-temperature carbon monoxide and propane total oxidation by nanocrystalline cobalt oxides

Salek, Guillaume and Alphonse, Pierre and Dufour, Pascal and Guillemet-Fritsch, Sophie and Tenailleau, Christophe Low-temperature carbon monoxide and propane total oxidation by nanocrystalline cobalt oxides. (2014) Applied Catalysis B: Environmental, 147. 1-7. ISSN 0926-3373

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Official URL: http://dx.doi.org/10.1016/j.apcatb.2013.08.015

Abstract

Pure CoO(OH), with intra particulate porosity up to 76%, was synthesized by an innovative aqueous precipitation method, starting either from nitrate or sulfate salts. Microstructural and chemical properties were characterized by powder X-ray diffraction (XRD), thermogravimetry (TG) and differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). The primary particles (10–15 nm) are self-organized in monolayer building hexagonal nano-platelets (50–200 nm) which are arranged randomly creating large pores. CoO(OH) was converted in Co3O4 by heating in air at 250 °C. This treatment did not modify the porosity but increased the specific surface area, which became close to 100 m2/g. The catalytic activity for CO and C3H8 total oxidation was better for Co3O4 than for CoO(OH). Besides, at high conversion rate, catalysts prepared from sulfate precursor showed a superior activity for C3H8 oxidation than those prepared from nitrate. This effect can be explained by the improved accessibility of reactants to the surface of the catalysts which exhibit a larger porosity. To our knowledge, the activity values presented here are the highest reported in literature for C3H8 total oxidation.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Applied Catalysis B: Environmental website : http://www.sciencedirect.com/science/article/pii/S0926337313005158
HAL Id:hal-01160190
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:04 Jun 2015 14:23

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