Engineering a Ce-promoted Ni/C-CaO catalyst for hydrogen-rich syngas production from corn stover and coal gangue Co-gasification

Hydrogen-rich syngas was produced from co-gasification of CS and CG. • 4Ce-8Ni/C-CaO markedly enhanced H 2 formation and syngas quality. • The maximum H 2 content reached 59.71 mol%. • Ce promoted Ni dispersion, oxygen vacancy formation, and coke resistance. The catalytic co-gasification of agricultural residues and coal-derived solid wastes offers an industrially promising route for converting low-value carbon resources into hydrogen-rich syngas. In this study, a Ce-Ni/C-CaO composite catalyst was prepared by impregnation and applied to the steam-assisted co-gasification of corn stover (CS) and coal gangue (CG) in a two-stage fixed-bed system. The effects of metal loading, feedstock ratio, temperature, and steam flow rate were investigated, the structure-performance relationship of the catalyst was further examined using XRD, SEM/BET, TEM/STEM-EDS, XPS, H 2 -TPR and O 2 -TG analyses. Under the optimal conditions of CS:CG = 5:5, pyrolysis at 850 ℃, reforming at 900 ℃, and a steam flow rate of 1 mL/min, the 4Ce/8Ni-C/CaO catalyst achieved an H 2 content of 59.71 mol% and a total gas yield of 19.13 mmol/g and an H 2 /CO ratio of 5.22. Characterization results indicated that the Ce species regulated the distribution of surface oxygen species, enhanced oxygen mobility, promoted the Ce 4+ /Ce 3+ redox cycle, and influenced the evolution of catalyst pore structure during the reaction. Download: Download high-res image (221KB) Download: Download full-size image