(2019) Energy Conversion and Management_Carbon dioxide-cofeeding pyrolysis of pine sawdust over nickle-based catalyst for hydrogen production

Cho S.-H., Lee S.S., Jung S., Park Y.-K., Lin K.-Y.A., Lee J., Kwon E.E.

(Elsevier Ltd) Energy Conversion and Management ISSN: 1968904 Vol.201 Issue. Article No.112140 DOI: 10.1016/j.enconman.2019.112140

This study aimed to determine the synergistic effects of CO₂ on the catalytic pyrolysis of pine sawdust over a Ni-based catalyst (Ni/SiO₂) to establish a sustainable platform for H2 production. To elucidate the reaction mechanism, the CO₂-cofeeding pyrolysis of pine sawdust was performed. The CO₂-cofeeding pyrolysis of pine sawdust proved that the gas-phase reaction between CO₂ and pyrolysates led to the increase in the amount of generated CO. The CO₂ enhanced thermal cracking and dehydrogenation. These mechanistic features of CO₂ were catalytically enhanced when Ni/SiO₂ was employed as heterogeneous catalyst, which led to an increase in the amounts of generated H2 and CO. Hence, the CO that was additionally generated during the gas-phase reaction of CO₂ and pyrolysates could be further converted into H₂. In addition, CO₂ could be looped in the CO₂-cofeeding pyrolysis of pine sawdust. Furthermore, exploiting CO₂ as raw material or reactive gas medium in the catalytic pyrolysis process also offered a strategic means for preventing coke formation. © 2019 Elsevier Ltd

This study was supported by the National Research Foundation of Korea grant funded by the Korea Government (grant number NRF-2017R1D1A1B03028176). Seong-Heon Cho also acknowledges the financial support received from Hyundai Motor Chung Mong-Koo Foundation. This study was supported by the National Research Foundation of Korea grant funded by the Korea Government (grant number NRF-2017R1D1A1B03028176 ). Seong-Heon Cho also acknowledges the financial support received from Hyundai Motor Chung Mong-Koo Foundation .