Characterization of catalytic partial oxidation of methane with carbon dioxide utilization and excess enthalpy recovery

Wei-Hsin Chen and Shih-Cheng Lin

Applied Energy, 2016, vol. 162, issue C, 1152 pages

Abstract: The characteristics of catalytic partial oxidation of methane (CPOM) under CO2 addition and excess enthalpy recovery are investigated where a rhodium-based catalyst is employed. The influences of O2/CH4 and CO2/O2 molar ratios, in the ranges of 0.4–0.7 and 0–2, respectively, on CPOM performance are emphasized. The energy efficiency of the Swiss-roll reactor is also studied. The results reveal that the O2/CH4 ratio plays a crucial role in methane conversion, whereas it is insensitive to the CO2/O2 ratio. The H2 contributed by steam reforming is pronounced at higher O2/CH4 ratios; on the other hand, H2 produced from dry reforming is significant at lower O2/CH4 ratios and high CO2/O2 ratios. The H2/CO ratio in the product gas is between 1 and 2, and the values depends on the O2/CH4 and CO2/O2 ratios. Increasing CO2/O2 ratio substantially increases CO2 consumption, but leads to a decrease in CO2 conversion. Within the investigated ranges of O2/CH4 and CO2/O2 ratios, at least 18.2% and up to 77.0% of CO2 in the feed gas is converted to CO. The energy efficiency of the reaction system with considering CH4 conversion is between 83.5% and 89.9%. Overall, CPOM performed at O2/CH4=0.6 is recommended in that it provides higher CH4 conversion, syngas production, CO2 consumption, and system energy efficiency.

Keywords: Catalytic partial oxidation of methane (CPOM); Dry reforming; CO2 utilization; Syngas production; Heat recovery; Swiss-roll reactor (search for similar items in EconPapers)
Date: 2016
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Citations: View citations in EconPapers (10)

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DOI: 10.1016/j.apenergy.2015.01.056

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