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Preparation and operating conditions for cobalt cerium oxide catalysts used in the conversion of synthesis gas into light olefins

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Abstract

Cobalt cerium oxides, prepared using a co-precipitation procedure, were studied as catalysts for the conversion of synthesis gas to light olefins (C2-C4). Specifically, we studied the effect of a range of preparation variables, including the molar ratio of the [Co]/[Ce] of the precipitation solution, ageing time and calcination temperature. In addition, the effects of supports and promoters on the catalysts’ activity and selectivity and a range of reaction temperatures using synthesis gas with different H2/CO molar feed ratios were investigated. The catalyst containing a molar ratio of 80% Co and 20% Ce, aged for 2 h, supported with 15 wt% SiO2 without any promoter, at an operating temperature of 450 °C and an H2/CO feed ratio of 2/1 (GHSV = 4500 h−1), performed optimally for the conversion of synthesis gas to light olefins. The characterization of both the precursors and the calcined catalysts by powder X-ray diffraction, scanning electron microscopy, Brunauer-Emmett-Teller specific surface area measurements and thermal analysis methods, including TGA and DSC, show that all the preparation variables influenced the catalyst precursor structure.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, University of Sistan and Baluchestan, Zahedan, 98135-674, Iran

    A. A. Mirzaei, M. Galavy & A. Beigbabaei

  2. Iran Polymer and Petrochemical Institute, P.O. Box 14965/115, Tehran, Iran

    V. Eslamimanesh

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  1. A. A. Mirzaei
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  2. M. Galavy
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  3. A. Beigbabaei
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  4. V. Eslamimanesh
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Correspondence to A. A. Mirzaei.

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Mirzaei, A.A., Galavy, M., Beigbabaei, A. et al. Preparation and operating conditions for cobalt cerium oxide catalysts used in the conversion of synthesis gas into light olefins. JICS 4, 347–363 (2007). https://doi.org/10.1007/BF03245986

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