The results from the observed 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 determine their performance using a liquid fuel. The extinction limits were also compared to those of non-catalytic combustion in the same reactor. The results showed that the addition of a catalyst greatly expanded the range of stable operating conditions, in respect to 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 opposed to the 61.4% offered by the Pt catalyst at lean conditions); however, the Pt catalyst had superior CO2 selectivity for most studied conditions, indicating higher combustion efficiency. The Pt catalyst also had a significantly smaller activation energy (13.8 kJ/mol) than the Rh catalyst (74.7 kJ/mol), except at equivalence ratios richer than Φ = 1.75 (corresponding to catalyst temperatures below 500 °C), where it abruptly changed to 211.4 kJ/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 a liquid-fueled meso-scale combustor, as fuel conversion has been shown to be a limiting factor for combustion stability in these systems.
- Power Division
Catalytic and Non-Catalytic Combustion of Propane in a Meso-Scale Heat Recirculating Combustor
- Views Icon Views
- Share Icon Share
- Search Site
Wierzbicki, TA, Lee, IC, & Gupta, AK. "Catalytic and Non-Catalytic Combustion of Propane in a Meso-Scale Heat Recirculating Combustor." Proceedings of the ASME 2014 Power Conference. Volume 1: Fuels and Combustion, Material Handling, Emissions; Steam Generators; Heat Exchangers and Cooling Systems; Turbines, Generators and Auxiliaries; Plant Operations and Maintenance; Reliability, Availability and Maintainability (RAM); Plant Systems, Structures, Components and Materials Issues. Baltimore, Maryland, USA. July 28–31, 2014. V001T01A013. ASME. https://doi.org/10.1115/POWER2014-32215
Download citation file: