Jump to main content
Jump to site search


Low-temperature CO oxidation over integrated Penthorum chinense-like MnCo2O4 arrays anchored on three-dimensional Ni foam with enhanced moisture resistance

Abstract

An advanced integrated nanoarrays (NAs) catalysts have been designed by growing M-doped Co3O4 arrays on nickel foam with robust adhesion. With different transition metal (Cu2+, Mn2+, Fe2+, Ni2+, Zn2+, Fe3+ and Al3+) doping urchin-like Co3O4 to construct ternary MCo2O4 nanoarray-based catalysts, the as-prepared MCo2O4 NAs exhibits some novel morphology, and can be directly applied as monolithic materials for CO oxidation. Among the MCo2O4 NAs catalysts, the resultant CuCo2O4 nanoneedles catalyst manifests the highest catalytic activity under dry air, achieving an efficient 100% CO oxidation conversion of 20,000 h−1 at 146 °C, due to its lower-temperature reducibility, the lattice distortion of the spinel structure and the abundant surface-adsorbed oxygen (Oads). Specifically, the doped catalytic systems are further optimized by controlling the volume ratio of reactive components in the mixed solvent, the Cu or Mn contents to find out the excellent catalysts which can be directly applied to CO oxidation at 1.0 vol.% moisture. It is found that the Penthorum chinense-like MnCo2O4 NAs owns optimal catalytic performance with 1 vol.% moisture (T100 = 175 °C), whose activity is higher rather than that of the CuCo2O4 NAs catalyst, indicating the synergistic effect between MnOx and Co3O4 is benefited for the improved moisture resistance and stability. It can be concluded that the moisture resistance of introducing active sites on Co-based catalysts decreased as follows: Mn sites > Co sites > Cu sites > Ni sites, and the MCo2O4 NAs dominantly exposed {110} surfaces shows the higher catalytic activity than these catalysts exposed {111} surfaces. This work suggests that the as-prepared MnCo2O4 NAs anchored on 3D Ni foam with remarkable moisture resistance has potential application in CO oxidation.

Back to tab navigation

Supplementary files

Publication details

The article was received on 04 Dec 2017, accepted on 12 Feb 2018 and first published on 13 Feb 2018


Article type: Paper
DOI: 10.1039/C7CY02474F
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
  •   Request permissions

    Low-temperature CO oxidation over integrated Penthorum chinense-like MnCo2O4 arrays anchored on three-dimensional Ni foam with enhanced moisture resistance

    S. Mo, S. Li, H. Xiao, H. He, Y. Xue, M. Zhang, Q. Ren, B. Chen, Y. Chen and D. Ye, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C7CY02474F

Search articles by author

Spotlight

Advertisements