Low Temperature CO Oxidation Over a Novel Nano-Structured, Mesoporous CeO2 Supported Au Catalyst
Highly active, nano-structured, mesoporous CeO2
(CN) supported Au catalysts have been studied for low temperature
catalytic CO oxidation. These catalysts were synthesized by first synthesizing the CeO2
support via chitosan template process
followed by 1 wt% Au incorporation using precipitation-deposition method. A complete CO conversion into CO2
was
achieved at room temperature over Au–CeO2 (A-CN-110) catalyst with a specific rate of 2.65 molCO.gAu
−1 h−1. The A-CN-
110 catalyst treated under different oxidation and reduction atmosphere was also very active at room temperature. The CO
oxidation activity of CN based materials was also compared with commercial CeO2
(C) supported catalysts, as well as those
reported in the literature. The catalysts were characterized in detail using p-XRD, BET-SA, ICP-OES, SEM, XPS, EDX,
H2-
TPR, O2-
TPD, and HR-TEM techniques. The structure property relationship clearly demonstrates that the key factors for
superior catalytic activity are; reducible nature of support/improved defects (
Ce3+), lower crystallite size, and high surface
area. Oxidation state, nature of dispersion, and particle size of Au also influences the catalytic activity. Strongly bound gold
nano-particles with ceria surface assist the reducibility of the surface oxygen, which enhances the catalytic activity.
20% iron catalysts supported on combined alumina and silica through different proportions (Al2O3:SiO2:
100:0.00, 90.0:10.0, 80.0:20.0 and 0.0:100.0) were tested for the catalytic…
A novel approach to the in situ regeneration of a spent alumina-supported cobalt–iron
catalyst for catalytic methane decomposition is reported in this work. The spent catalyst was
…