Funct. Mater. 2021; 28 1: 178-186.
doi:https://doi.org/10.15407/fm28.01.178
Determination of pressure drop in a fixed bed catalytic reactor during ammonia oxidation on nanostructured platinum catalyst
Institute of Chemistry and Chemistry Technology, Department of Chemical Engineering, Lviv Polytechnic National University, 12 S.Bandery Str., 79013 Lviv, Ukraine
Abstract:
Nanostructured platinum catalyst has been obtained by an electrochemical method. In order to generate the fixed bed, the catalyst was randomly arranged at the perforated bottom of the reactor; the reactor-to-particle diameter ratio was D/dp = 24.5. The effect of the increasing gas velocity on the pressure drop in the fixed beds with a length of 35·10-3, 45·10-3, 55·10-3, 65·10-3 and 75·10-3 m, which were generated in the downflow reactor, has been established by an experimental method. Ergan and Darcy-Weisbach equations have been used as the numerical methods to calculate the pressure drops within the Reynolds number range of 312≤Re≤1177. The difference between experimental and calculated values of the pressure drops was found to be increased with an increase in the Reynolds number. On the basis of the experimental results, the equation ΔP = 49·Reexp-0.11·(H/de)·(dp/D) ·ρ·υ2 has been proposed, which allows us to calculate theoretically the pressure drop in the downflow fixed bed reactor with the developed catalyst within the Reynolds number range of 312≤Reexp≤1177. The maximum relative error between the experimental and theoretical values does not exceed ±3 %.
Keywords:
nanostructured platinum catalyst, fixed bed reactor, pressure drop, low-temperature ammonia oxidation process, hydraulic resistance, similarity criterion, energy costs.
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