Catalytic pyrolysis of pine needle biomass over Fe-Co-K catalyst for H-2-rich syngas production: Influence of catalyst preparation

In this work, the effects of preparation methods of Fe-Co-K catalysts on biomass pyrolysis were studied in a fixed bed reactor under 0.1 MPa N-2 and 700 degrees C. The results showed that Fe-Co bimetallic catalyst has better activity than Fe. the yields of H-2 and CO increased from 84.90 ml/g and 63.94 ml/g (Fe) to 98.42 ml/ g and 85.43 ml/g (Fe + Co) prepared by co-impregnation, respectively, and the CO2 yield was 276.94 ml/g. The preparation of Fe* + Co* catalyst by co-precipitation could not only improve the yields of H-2 (138.23 ml/g) and CO (89.75 ml/g), but also reduce the CO2 yield (225.19 ml/g). In the Fe* + Co* catalyst system, the addition of 0.6 wt% K increased the yields of H-2 and CO to 153.85 ml/g and 107.80 ml/g. Characterization proved that the crystallinity of Co3Fe7 in Fe*+Co* was stronger than that of Fe + Co, and the addition of Co facilitates the reduction of Fe, K promoted the dispersion of Fe* + Co* and enhanced the catalytic activity. This study provided theoretical support for increasing the yields of H-2 & nbsp; and CO while reducing the CO2 yield. (c) 2021 Elsevier Ltd. All rights reserved.