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Combustion of propane with Pt and Rh catalysts in a meso-scale heat recirculating combustor

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  • Wierzbicki, Teresa A.
  • Lee, Ivan C.
  • Gupta, Ashwani K.

Abstract

The results obtained from the combustion behavior of propane over platinum and rhodium catalysts in a meso-scale heat recirculating combustor are presented. The extinction limits, conversion, product selectivity/yield, and activation energy using the two catalysts were compared in an effort to predict their performance using a liquid fuel. The extinction limits were also compared to those of non-catalytic combustion in the same combustor. The results showed that the use of a catalyst greatly expanded the range of stable operating conditions, in terms of both extinction limits and flow rates supported. The Rh catalyst was found to exhibit a higher propane conversion rate, reaching a maximum of 90.4% at stoichiometric conditions (as compared to only 61.4% offered by the Pt catalyst under lean conditions), but the Pt catalyst had superior CO2 selectivity for most of the examined conditions, indicating more of the heat released being used for product formation as opposed to being lost to the environment. However, despite having a higher rate of heat loss, the combustion with the Rh catalyst produced an overall higher amount of enthalpy than the Pt due to its superior fuel conversion. The Pt catalyst also had a significantly smaller activation energy (13.8kJ/mol) than the Rh catalyst (74.7kJ/mol), except at equivalence ratios richer than Φ=1.75 (corresponding to catalyst temperatures below 500°C), where it abruptly changed to 211.4kJ/mol, signifying a transition from diffusion-limited reactions to kinetically limited reactions at this point. The results reveal that Rh would be a more suitable catalyst for use in liquid-fueled meso-scale combustors, as fuel conversion has been found to be a limiting factor for combustion stability in these systems, and as its higher output energy allows for greater flexibility of use.

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  • Wierzbicki, Teresa A. & Lee, Ivan C. & Gupta, Ashwani K., 2014. "Combustion of propane with Pt and Rh catalysts in a meso-scale heat recirculating combustor," Applied Energy, Elsevier, vol. 130(C), pages 350-356.
    • Handle: RePEc:eee:appene:v:130:y:2014:i:c:p:350-356
    DOI: 10.1016/j.apenergy.2014.05.069
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    1. Vijayan, V. & Gupta, A.K., 2010. "Combustion and heat transfer at meso-scale with thermal recuperation," Applied Energy, Elsevier, vol. 87(8), pages 2628-2639, August.
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    4. Wierzbicki, Teresa A. & Lee, Ivan C. & Gupta, Ashwani K., 2014. "Performance of synthetic jet fuels in a meso-scale heat recirculating combustor," Applied Energy, Elsevier, vol. 118(C), pages 41-47.
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