Document Type
Article
Publication Date
1-1-2021
Abstract
Sulfur and coking tolerance of Ni-based dry reforming catalysts were examined. Catalysts utilizing both Ce/Zr and Ce/La oxide supports, some with additional Co, were tested. Long-term reaction runs were conducted with and without sulfur in the feed. Catalysts were also characterized by STEM, XPS, XAFS and XANES and CO chemisorption. Only catalysts where Co was also present, and supported on the Ce-Zr oxide, were capable of extended sulfur tolerance at >20 ppm sulfur. This tolerance, along with a greatly reduced coking rate, is linked to Co in intimate contact with Ni, the mixture existing as clusters anchored and influenced electronically by the oxide support. The activation of methane takes place on these sites. Larger metal aggregates formed by ripening during reaction appear to be spectators. The measured activation energies for dry reforming suggest that CO2 activation takes place at the oxide interface, and is a kinetically significant step.
Publication Source (Journal or Book title)
Journal of Catalysis
First Page
215
Last Page
229
Recommended Citation
Jiang, C., Loisel, E., Cullen, D., Dorman, J., & Dooley, K. (2021). On the enhanced sulfur and coking tolerance of Ni-Co-rare earth oxide catalysts for the dry reforming of methane. Journal of Catalysis, 393, 215-229. https://doi.org/10.1016/j.jcat.2020.11.028