کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6476443 | 1425386 | 2017 | 6 صفحه PDF | دانلود رایگان |

- Pd/γ-Fe2O3 activity for CO oxidation was 2.6 times higher than that of Pd/α-Fe2O3 at 0 °C.
- The close contact between Pd and γ-Fe2O3 enhanced the redox recycle between Fe3 + and Fe2 +.
- Carbonate absorbed on α-Fe2O3 significantly blocked O2 activation and then inhibited CO oxidation.
Pd/Fe2O3 catalysts were prepared by deposition-precipitation method and investigated for CO oxidation. Compared with Pd/α-Fe2O3, Pd/γ-Fe2O3 exhibited the higher CO oxidation activity, and CO completely oxidation temperature was obtained at 0 °C. CO oxidation occurred through the dual sites mechanism, namely CO adsorbed on Pd species and O activation on the support. The close contact between Pd and γ-Fe2O3 enhanced the redox recycle between Fe3 + and Fe2 + species, which played a decisive role in oxygen activation. The excellent performance in oxygen activation efficiently accelerated the rate-determining step in CO oxidation. The accumulated carbonate and hydrocarbonate species on α-Fe2O3 blocked the oxygen activation which resulted in the low activity of Pd/α-Fe2O3 in CO oxidation.
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Journal: Fuel Processing Technology - Volume 160, 1 June 2017, Pages 152-157