The utilization of CO2 has attracted lots of attentions, while the conversion and utilization of common low concentration carbon dioxide has not been widely concerned. Herein, oxygen-free low concentration(<40) CO2 mixed gas has been explore in the utilization of methane reforming. the low concentration CO2 mixed gas, which derived from biomass gasification, combined steam reforming methane route has been proposed and explored in the study. The effect of each key parameters, including CO2 mixed gas addition, reaction temperature, S/C and WHSV, on the syngas yield were investigated.In the proper condition, an product with H-2/CO ratio around 2 and 97 syngas purity was obtained. Furthermore, since the Ni-modified volcanic rock catalyst showed excellent activity in the reforming reaction, its stability was further confirmed via life test, meanwhile, the other characterizations were observed via XRD, SEM,TEM and BET. the results showed that the catalyst was stable after 24h life experiment with less than 0.15 carbon deposited. Moreover, TEM results revealed that Na and Fe existed in the volcanic rock would gradually migrated to the Ni particle during the reaction, which should be the main mechanism for the improvement of activities and stability of the catalysts. The study provide a new way to utilized the low concentration CO2 mixed gas. (C) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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