Production of H2- and CO-rich syngas from the CO2 gasification of cow manure over (Sr/Mg)-promoted-Ni/Al2O3 catalysts

Soheil Valizadeh, Hanie Hakimian, Eui Hyun Cho, Chang Hyun Ko, See Hoon Lee, Gwang Hoon Rhee, Sang Chul Jung, Kyung Seun Yoo, Young Kwon Park

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

The valorization of cow manure (CM), as bio-waste, under a CO2 atmosphere could be an attractive strategy for tackling the environmental problems related to waste management and CO2 emission and producing valuable syngas. For this purpose, highly loaded Ni–Al2O3 catalysts with alkaline-earth metals (Mg and Sr) were synthesized and applied to the gasification of CM under CO2. The lowest yields of bio-oil (16.98 wt %) and coke (0.34 wt %) and the highest yield of syngas (55.09 wt %) were obtained from the catalytic decomposition of hydrocarbons when Sr was incorporated into Ni/Al2O3 (SN-AO). The highest selectivity for H2 (34.23 vol %) and CO (37.16 vol %) were obtained applying SN-AO followed by Mg-promoted Ni/Al2O3 (MN-AO) and Ni/Al2O3 (N-AO) catalysts. With increasing gasification temperature from 750 °C to 850 °C, the syngas yield (from 55.09 to 70.17 wt %) and H2 concentration (from 34.23 to 38.03 vol %) increased considerably because of the endothermic gasification process. The yield and selectivity of syngas (H2 and CO) increased under CO2 compared to those obtained under N2, indicating the high potential of CO2 for the thermal decomposition and dehydrogenation of the volatile matter.

Original languageEnglish
Pages (from-to)37218-37226
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume47
Issue number88
DOIs
StatePublished - 30 Oct 2022

Keywords

  • Alkaline-earth metals
  • Bimetallic catalysts
  • Biowaste
  • H generation

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