High-efficiency steam catalytic co-gasification of corncob mediated by corncob char supported catalyst to produce H2 rich synthesis gas

This study investigates the co-gasification of corncob and corncob char for hydrogen production, focusing on the catalytic role of char as a catalyst carrier to enhance gasification efficiency and hydrogen yield. The results demonstrate that corncob char loaded with potassium ions exhibits excellent catalytic performance. Adjusting the gasification temperature and steam flow rate within a certain range significantly improves syngas yield. Under optimal conditions, with corncob biochar loaded with 5 wt% KOH, the co-gasification process achieved a syngas yield of 893 g/kg and a hydrogen yield of 95 g/kg, with a cold gas efficiency of 53.95%. Without the addition of a catalyst, the synergy index for corncob and corncob char was 1.1, while the addition of a catalyst increased it to a maximum of 1.28, indicating positive synergy in all aspects of co-gasification. Compared to other biomass gasification methods, using biochar as a co-gasification feedstock not only improves hydrogen yield but also reduces tar formation.