Manganese-promoted cobalt oxide as efficient and stable non-noble metal catalyst for preferential oxidation of CO in H(2) stream
- 化学化工－已发表论文 
The modification by MnO(x) significantly enhanced the activity and stability of Co(3)O(4) for the preferential oxidation of CO in H(2)-rich stream. The MnO(x)-promoted Co(3)O(4) catalyst with a Mn/Co molar ratio of 1/8 exhibited the best performance; CO conversion was 56% at 40 degrees C and increased to >90% as the temperature was raised to >75 degrees C. This catalyst could provide 100% CO conversion at 125-175 degrees C. CO conversions of 97% and 100% remained unchanged for 100 h at 100 and 125 degrees C, respectively, whereas the deactivation was observed over Co(3)O(4) alone. Our characterizations using XRD, XPS and TEM indicated that the modification of Co(3)O(4) with MnO(x) caused the formation of smaller Mn(x)Co(3-x)O(4) solid-solution particles. The O(2)-TPD, CO-TPD, and pulse reaction studies suggest that the incorporation of MnO(x) into Co(3)O(4) increased the amounts of reactive oxygen species and adsorbed CO species over catalyst surfaces and enhanced the regeneration ability of the reduced catalyst by O(2). All these enhancements are proposed to be responsible for the improved catalytic performance of the MnO(x)-promoted Co(3)O(4). (C) 2010 Elsevier B.V. All rights reserved.
出处APPLIED CATALYSIS B-ENVIRONMENTAL，2011,102（1-2）：207-214