کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
61396 | 47578 | 2012 | 7 صفحه PDF | دانلود رایگان |

CO oxidation is studied at pressures between 4 and 100 Torr and temperatures from 400 K to 670 K on inverse model catalysts made of Fe2O3 nanoclusters grown on a Au(1 1 1) single crystal surface. The addition of Fe2O3 nanoclusters transformed the inert Au(1 1 1) single crystal into an active catalyst for CO oxidation. The catalytic activity increases with iron oxide coverage initially and then decreases when the iron oxide coverage is greater than 0.5 monolayers. Additionally, when the iron oxide particles form a continuous film on Au(1 1 1), there is no catalytic activity. These experimental results strongly suggest that the active sites for CO oxidation are located at the iron oxide/gold perimeter. Kinetic measurements suggest that CO oxidation by chemisorbed oxygen at the Fe2O3/Au perimeter is likely to be the rate-limiting step. Carbon deposition observed via a post-reaction Auger electron spectra suggests that multiple reaction pathways are involved in CO oxidation over Fe2O3/Au(1 1 1).
Fe2O3 clusters supported on Au(1 1 1) is an active catalyst for CO oxidation. The perimeter between iron oxide and gold is the active center. The rate-limiting step is CO oxidation by chemisorbed molecular oxygen at the perimeter.Figure optionsDownload high-quality image (43 K)Download as PowerPoint slideHighlights
► Fe2O3 particles supported on the Au(1 1 1) single crystal were studied as CO oxidation catalysts.
► Active centers are on the Fe2O3/Au(1 1 1) perimeter.
► CO oxidation by chemisorbed O2 at the perimeter is the kinetically relevant step.
Journal: Journal of Catalysis - Volume 294, October 2012, Pages 216–222