Syngas production by carbon dioxide reforming of methane over Pt/Al2O3 and Pt/ZrO2-SiO2 catalysts

Abstract

Carbon dioxide reforming of methane (CDRM) is an effective way for syngas production. In this work, two laboratory-made Pt-based catalysts Pt/Al2O3 and Pt/ZrO2-SiO2 (Pt content = 0.5%) were used for the CDRM process in a fixed-bed reactor. The effects of changing space time (0.08–0.167 g-h/L) on CH4 and CO2 conversions and syngas ratio and yield were studied in the 773–1073 K range in an integral reactor. At 1073 K, the effects of CO2/CH4 ratio in the feed (0.5–2 mol/mol) and time-on-stream (up to 10 h) were investigated. For an equimolar feed of CH4 and CO2, the conversions of CH4 (72.6 and 70.6%) over Pt/Al2O3 and Pt/ZrO2-SiO2 catalysts at T = 1073 K and space time = 0.167 g-h/L were comparable; the corresponding CO2 conversion values were 77.6 and 74.8%. The kinetics of CDRM was studied between 848 and 898 K in a differential reactor and the data were analyzed using the power-law and Langmuir-Hinshelwood kinetic models.