Kinetic modeling of catalytic partial oxidation of methane over Ni-Rh/γ-Al2O3 catalyst for syngas formation

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The kinetic experiments of catalytic partial oxidation of methane (CPOM) were carried out at various working conditions (i.e., temperature: 500–900 °C, pressure: 1–20 bar, CH4/O2 ratio of 1.5–2.5 and gas hourly space velocity (GHSV) of 900–3000 h−1 on Ni-Rh/γ-Al2O3 catalyst. The kinetic model development relied on the direct pathway of CPOM and depended on Langmuir-Hinshelwood method. The outcomes presented the methane conversion, H2 yield; CO and CO2 selectivity were affected by the operating variables. High temperature was suitable for more methane conversion, H2 yield and CO selectivity. However, elevated temperature has a reverse effect on CO2 selectivity. The high reactor pressure has no profit on CPOM regard to CH4 conversion, H2 yield and CO selectivity. Although, CO2 selectivity was not sensitive to pressure. An augmentation in oxygen amount in the inlet feed led to enhancement of CH4 conversion, CO and CO2 selectivity, while this trend for H2 yield was reverse. The precision of kinetic model was appraised by statistical analysis to examine the significance and rational of the estimated parameters. Results described that the experimental values were well anticipated using our proposed model, by applying fugacity in the rate equations and PC-SAFT equation of state (EOS).