Abstract
Low temperature (450–600 °C) bi-reforming of methane was studied over platinum (0.16 wt%) or palladium (0.13 wt%) along with nickel (1.4 wt%) and magnesium (1.0 wt%) immobilized onto a ceria–zirconia support (termed 0.16Pt and 0.13Pd). Bi-reforming studies using a feed ratio of 3:1:2 for CH4:CO2:H2O, respectively, showed that the H2:CO ratio neared the desired ratio of 2 between 500 and 600 °C for the 0.16Pt catalyst and consistent with bi-reforming at more traditional conditions. This H2:CO ratio was desirable (near 2) compared to dry or steam reforming alone, as well as to other CH4:CO2:H2O ratios. Reaction studies showed that CH4 conversion decreased with increasing GHSV (68,000–272,000 h−1) at 500 °C and increased with increasing temperature at a GHSV of 136,000 h−1 for both catalyst systems. However, the Pt-based catalyst had more consistent H2:CO ratios between 1.9 and 2.2 (T ≥ 500 °C) compared to its Pd counterpart (H2:CO ratios of 1.6–3.0), which was linked to the increased rWGS activity and stronger CO2 adsorption. This study indicates reasonable CH4 conversions and H2:CO ratio near 2 can be achieved despite operating in this low temperature regime and may enable intensified processes for the conversion of methane to value-added products.
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Support from NASA through the Florida Space Grant Consortium, the Hinkley Center for Solid and Hazardous Waste Management, and the Graduate Students Success Fellowship (to NHE) that is administered by the USF School of Graduate Studies is gratefully acknowledged.
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BJ and JNK co-invented U.S. patent number 9,328,035 on a related technology.
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Elsayed, N.H., Maiti, D., Joseph, B. et al. Precious Metal Doped Ni–Mg/Ceria–Zirconia Catalysts for Methane Conversion to Syngas by Low Temperature Bi-reforming. Catal Lett 148, 1003–1013 (2018). https://doi.org/10.1007/s10562-018-2310-y
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DOI: https://doi.org/10.1007/s10562-018-2310-y