Reaction kinetics of propane deep oxidation over commercial Pt/Pd bimetallic catalyst

Abstract

Noble metal-based catalysts have attracted widespread attention in environmental protection applications, especially in the catalytic combustion of light alkane pollutants. The most commonly Pt–Pd bimetallic oxide catalysts are used for propane light hydrocarbon combustion. As per the literature, there is not much data on reaction kinetics and modeling studies for propane deep oxidation using commercial industrial catalyst. This paper deals with insights on the kinetics and modeling of a complete propane oxidation over commercial Pt–Pd mixed metal oxide catalyst studied in a fixed bed reactor. Optimized process parameters by varying of temperature, gas hourly space velocity (GHSV), propane concentration and catalyst stability were studied systematically. Under identical reactions conditions, catalyst evaluated at different temperature and ∼99.7 % propane conversion was achieved at 350 °C temperatures. Further, catalyst stability was performed for 35 h and the propane conversion >99 % was retained. The study also demonstrates that at high oxygen concentrations, the oxidation rate becomes substantially independent of oxygen concentration. Among the several kinetic models investigated, the best fit was achieved with the Mars–Van–Krevelen kinetic model.