abstract
In this study, granulated siderite/concrete-based catalysts are proposed for in-situ applications in biomass steam gasification, seeking H-2-enrichement by the contribution of water gas shift and CO2 adsorption. A cost-effective procedure has been applied for the preparation of granulated catalysts. Water Gas Shift reaction was studied in a fixed bed reactor and Taguchi experimental design was used to elucidate the relevance of experimental parameters on catalyst performance. The results show that the impact of reaction temperature, concrete/siderite ratio and steam to carbon molar ratio on H-2 promotion had the following order: reaction temperature (43.1%), concrete/siderite ratio (30.2%) and steam to carbon molar ratio (26.7%). Additionally, the catalyst exhibited high activity when integrated into the freeboard zone of a bubbling fluidized bed gasifier. Compared to the reference condition, one observed significant impact at 700 C on the H-2:CO ratio (1.9 to 3.3), H-2 production (33.8 to 48.6 gH(2) & BULL;kg(dry,fuel)(-1)), carbon conversion efficiency (54.1 to 58.6%) and cold gas efficiency (55.0 to 60.9%). Though the catalyst exhibited resistance to sintering, post-mortem analysis suggests loss of active species after repeated cycles of regeneration due to thermal-induced stresses, which caused gradual decrease in activity.
keywords
ENHANCED HYDROGEN-PRODUCTION; TEMPERATURE WGS REACTION; CALCIUM-CARBONATE; TAR ELIMINATION; SHIFT REACTION; CO2 CAPTURE; CELLULOSE; BEHAVIOR; OXIDE; FE
subject category
Thermodynamics; Energy & Fuels; Mechanics
authors
Ruivo, L; Oliveira, H; Gomes, H; Cruz, N; Yaremchenko, A; Frade, J; Tarelho, LAC
our authors
Aleksey Yaremchenko
Principal Researcher
Helena Oliveira
Post-Doc Fellowship
Jorge Ribeiro Frade
Retired Professor
Luís Carlos Marques Ruivo
PhD StudentProjects
Novos conceitos de catalisadores para oxi-vapor gasificação de biomassa sem alcatrões. (NOTARGAS)
SusPhotoSolutions - Soluções Fotovoltaicas Sustentáveis (SUSPHOTOSOLUTIONS)
acknowledgements
The authors acknowledge the financial support through projects NOTARGAS (ref. POCI-01-0145-FEDER-030661) and SusPhotoSolutions -Solucoes Fotovoltaicas Sustentaveis, PO Centro 2020 (ref. CENTRO-01-0145-FEDER-000005). Thanks are due to the Portuguese Foundation for Science and Technology (FCT)/Ministry of Science, Technology and Higher Education (MCTES) for the financial support to CESAM (UIDP/50017/2020+UIDB/50017/2020+LA/P/0094/2020), and CICECO (UIDB/50011/2020 & UIDP/50011/2020), through national funds. The authors also acknowledge the Portuguese Foundation for Science and Technology for providing financial support to the PhD scholarship granted to Luis Ruivo (ref. SFRH/BD/129901/2017) and Helena Gomes (ref. 2020.09864.BD). The authors sincerely thank Mr. Bill Fuerst for his support during the development of the work.