resumo
The present work intended the development of a graphical approach to support the operation of conventional iron-based catalysts under gasification conditions. A combination of experimental data and thermodynamic modelling was used as guidelines to elucidate the dependence of catalyst performance on the thermochemical conditions of producer gas. The outcomes are represented by stability diagrams in a form of planar represen-tations for easier identification of appropriate operating windows. Attention was focused not only on potential deactivation mechanisms resulting from gas-solid interactions, but also on the stability of relevant catalytic phases when exposed to biomass-derived gas atmospheres at temperatures in the range 600-900 degrees C. The results suggest that controlled process parameters contributes to enhance the tolerance of iron-based materials to deactivation by carbon deposition, H2S poisoning and/or carbonation. Selected examples also show that the redox potential imposed by producer gas can have a significant impact on the stability of relevant active phases, with subsequent impact on catalyst performance. To overcome these constrains, one should considerer suitable composition changes to enhance their redox properties, possibly combined with microstructural or nano-structural development during materials processing.
palavras-chave
HYDROGEN-RICH GAS; CHEMICAL-LOOPING GASIFICATION; FLUIDIZED-BED GASIFICATION; TAR REFORMING CATALYST; STEAM-GASIFICATION; OXYGEN CARRIER; SYNGAS PRODUCTION; PERFORMANCE; TEMPERATURE; METAL
categoria
Thermodynamics; Energy & Fuels
autores
Ruivo, L; Silva, T; Neves, D; Tarelho, L; Frade, J
nossos autores
Jorge Ribeiro Frade
Professor(a) Jubilado(a)
Luís Carlos Marques Ruivo
Estudante de doutoramento
Tiago Filipe Vieira da Silva
Estudante de doutoramentoProjectos
Novos conceitos de catalisadores para oxi-vapor gasificação de biomassa sem alcatrões. (NOTARGAS)
Collaboratory for Emerging Technologies, CoLab (EMERGING TECHNOLOGIES)
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
agradecimentos
The authors acknowledge the financial support through projects NOTARGAS (ref. POCI-01-0145-FEDER-030661) and CHARCLEAN (PCIF/GVB/0179/2017). Thanks 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 - Aveiro Institute of Materials (UIDB/50011/2020, UIDP/50011/2020 & LA/P/0006/2020), 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).