Three series of Cr-based mixed oxides (Cr-Co, Cr-Fe, and Cr-Ni oxides) with high specific surface areas and amorphous textures were synthesized using a novel sol-gel method. These mixed oxides, in comparison to their pure metal oxide (CrOx, Co3O4, FeOx and NiO) counterparts, display enhanced performance for catalytic oxidation of low-concentration NO at room temperature. The best performing catalysts achieve 100% NO conversion for ~30 h of operation at a high space velocity of 45,000 ml g-1 h-1. The amorphous structure was found to be critical for these catalysts to maintain high activity and durability. Control of Cr/M (M=Co, Fe and Ni) molar ratio, nitrate precursor decomposition temperature and catalyst calcination temperature was key to the synthesis of these highly active catalysts.
Revised: February 27, 2020 |
Published: April 26, 2017
Citation
Wang A., B. Lin, H. Zhang, M.H. Engelhard, Y. Guo, G. Lu, and C. Peden, et al. 2017.Ambient Temperature NO Oxidation Over Cr-based Amorphous Mixed Oxide Catalysts: Effects From the Second Oxide Components.Catalysis Science & Technology 7, no. 11:2362-2370.PNNL-SA-127641.doi:10.1039/c7cy00490g