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M. Cortazar,L. Santamaria,G. Lopez,J. Alvarez,M. Amutio,J. Bilbao,M. Olazar 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.99 No.-
The performance of Fe/olivine catalysts was tested in the continuous steam gasification of sawdust in abench scale plant provided with a fountain confined conical spouted bed reactor at 850 C. Olivine wasused as catalyst support and loaded with 5 wt%Fe. The activity and stability of the catalyst was monitoredby nitrogen adsorption-desorption, X-rayfluorescence spectroscopy, temperature programmedreduction, X-ray diffraction and X-ray photoelectron spectroscopy techniques, which were conductedbefore and after the runs. The fountain confined conical spouted bed performs well in the biomass steamgasification with primary catalysts. In fact, this reactor allows enhancing the gas-solid contact, andtherefore the catalytic activity by avoiding the elutriation offine catalyst particles. The uncatalysedefficiency of the gasification process, assessed based on the gas production and composition, H2production, tar concentration and composition, and carbon conversion efficiency, was considerabyimproved on the Fe/olivine catalyst, with tar reduction being especially remarkable (to 10.4 g Nm 3). After 140 min on stream, catalyst deactivation was particularly evident, as tar concentration increased to19.9 g Nm 3 (90% of that without catalyst). However, Fe/olivine catalyst was still active for WGS and CH4steam reforming reactions, with gas and H2 productions being 1.35 Nm3 kg 1 and 5.44 wt%, respectively. Metal iron oxidation to Fe3O4 caused catalyst deactivation, as the reaction environment shifted fromoxidizing to reducing conditions due to operational limitations.