Effect of supports over Pd/Fe 2 O 3 on CO oxidation at low temperature

• DOI: 10.1016/j.fuproc.2017.02.037
• Publication Date: 2017-03-06T09:46:35Z
• Authors: Li Wang; Chunhua Pu; Lele Xu; Yafeng Cai; Yanglong Guo; Yun Guo; Guanzhong Lu
• Keywords: Oxidation process

Abstract Pd/Fe 2 O 3 catalysts were prepared by deposition-precipitation method and investigated for CO oxidation. Compared with Pd/α-Fe 2 O 3 , Pd/γ-Fe 2 O 3 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-Fe 2 O 3 enhanced the redox recycle between Fe 3 + and Fe 2 + 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-Fe 2 O 3 blocked the oxygen activation which resulted in the low activity of Pd/α-Fe 2 O 3 in CO oxidation.