Oxy-CO2 reforming of methane to syngas over CoOx/MgO/SA-5205 catalyst

• Published in: Fuel (Guildford) Vol. 85; no. 17-18; pp. 2484 - 2488
• Main Authors: CHOUDHARY, V. R, MONDAL, K. C, CHOUDHARY, T. V
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier 01.12.2006
• Subjects: Applied sciences; Energy; Exact sciences and technology; Fuel processing. Carbochemistry and petrochemistry; Fuels; Gas processing; Cobalt oxide; Methane; Magnesium oxide; Oxy-CO2 reforming; Carbon dioxide; Temperature effect; Catalytic reforming; Alumina; Synthesis gas; Silica; Supported catalyst; Syngas
• ISSN: 0016-2361; 1873-7153
• DOI: 10.1016/j.fuel.2006.04.013

The oxy-CO2 methane reforming reaction (OCRM) has been investigated over CoOx supported on a MgO precoated highly macroporous silica-alumina catalyst carrier (SA-5205) at different reaction temperatures (700-900 deg C), O2/CH4 ratios (0.3-0.45) and space velocites (20,000-100,000cc/g/h). The reaction temperature had a profound influence on the OCRM performance over the CoO/MgO/SA-5205 catalyst; the methane conversion, CO2 conversion and H2 selectivity increased while the H2/CO ratio decreased markedly with increasing reaction temperature. While the O2/CH4 ratio did not strongly affect the CH4 and CO2 conversion and H2 selectivity, it had an intense influence on the H2/CO ratio. The CH4 and CO2 conversion and the H2 selectivity decreased while the H2/CO increased with increasing space velocity. The O2/CH4 ratio and the reaction temperature could be used to manipulate the heat of the reaction for the OCRM process. Depending on the O2/CH4 ratio and temperature the OCRM process could be operated in a mildly exothermic, thermal neutral or mildly endothermic mode. The OCRM reaction became almost thermoneutral at an OCRM reaction temperature of 850 deg C, O2/CH4 ratio of 0.45 and space velocity of 46,000cc/g/h. The CH4 conversion and H2 selectivity over the CoO/MgO/SA-5205 catalyst corresponding to thermoneutral conditions were excellent: 95% and 97%, respectively with a H2/CO ratio of 1.8.