Kinetics of methyl methacrylate combustion over a Pt/alumina catalyst

Ionut Banu, Corina Mihaela Manta, Ioana Stoica, Georgeta Bercaru, Grigore Bozga


The combustion of methyl methacrylate (MMA) over a commercial Pt/g-alumina catalyst was investigated, in lean air mixtures specific for depollution applications. The experiments were performed at temperatures between 150 and 360 oC, MMA concentrations of 460 to 800 ppmv and gas flow rates between 200 and 300 mL min-1. The results evidenced a negative influence of MMA concentration on combustion kinetics. A kinetic model of the combustion process was developed based on the Langmuir-Hinshelwood mechanism, assuming as controlling step the surface reaction between adsorbed oxygen atoms and adsorbed MMA molecules. The rate expression includes the inhibition effects of MMA and water adsorption on the process kinetics. The MMA combustion process simulations evidenced significant influences of the bulk gas to catalyst particle mass transfer, on the overall kinetics.


fixed bed reactor; kinetic model; Langmuir–Hinshelwood; light-off curve; gas–solid mass transfer

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