(2020) Journal of CO₂ Utilization_Synergistic effects of CO₂ on ex situ catalytic pyrolysis of lignocellulosic biomass over a Ni/SiO₂catalyst

Cho S.-H., Jung S., Park Y.-K., Tsang Y.F., Ryu C., Kwon E.E.

(Elsevier Ltd) Journal of CO2 Utilization ISSN: 22129820 Vol.39 Issue. Article No.101182 DOI: 10.1016/j.jcou.2020.101182

This work laid emphasis on catalytic pyrolysis of Styrax japonicus to construct a biomass-to-energy conversion platform. CO₂ was particularly chosen to enhance the catalytic pyrolysis of the biomass waste, in reference to N₂-purged pyrolysis. The specific roles of CO₂ on pyrolysis of S. japonicus in line with synergistic effect of Ni-based catalysts was investigated. It was shown that CO₂ played as an oxidant for CO formation via homogeneous gas phase reaction of CO₂ with volatile organic carbons (VOCs) liberated from the thermolysis of S. japonicus. Ni/SiO₂ catalyst expedited dehydrogenation (DH) of the VOCs, resulting in significant H₂ generation and alteration of aromaticity in VOCs. Each CO₂ and Ni catalyst independently enhanced CO and H₂ formation, respectively, and their synergistic effects were shown at ≥ 600 °C. Coke deposition on the Ni/SiO₂ catalyst was confirmed after catalytic pyrolysis, while the suppression of coke formation on the catalyst surface was achieved under the CO₂ environment. © 2020 Elsevier Ltd.

This study was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIT) (No. NRF-2019R1A4A1027795 ).