A series of Rh-substituted lanthanum zirconate pyrochlores doped with different loadings of Y (A-site or B-site) were synthesized and studied for methane steam reforming (MSR) under low steam-to-carbon ratios (S/C = 1.0). This study mainly focuses on Y doping in the pyrochlore structure and its potential influence on the catalytic activity of Rh and carbon formation during reaction. XANES data showed that doping Y into the pyrochlore resulted in an occupancy that was predominately located in the B-site, but overall the distribution of Y in each site was similar in all catalysts despite the loadings of Y and stoichiometry of the constituent pyrochlore cations. Activity testing showed that 4 wt% Y doping at La-site led to higher activity at high flow rate and feed dilution, and high selectivity to synthesis gas. This catalyst showed strong resistance to coking under a long-term stability test (300 h) and a series of low S/C ratios MSR.
Publication Source (Journal or Book title)
Applied Catalysis A: General
Zhou, Y., Haynes, D., Baltrus, J., Roy, A., Shekhawat, D., & Spivey, J. (2020). Methane steam reforming at low steam-to-carbon ratio: The effect of Y doping in Rh substituted lanthanum zirconates. Applied Catalysis A: General, 606 (None) https://doi.org/10.1016/j.apcata.2020.117802