Microwave direct denitration for synthesis of Cu-Ce-Zr-O composite oxide and its characterization

Cu‐Promoted Pt/Ce0.5Zr0.5Ox Catalyst for Ammonia Production Reaction of Passive SCR from Nitric Oxide and Hydrogen

“…On the copper-doped samples, a triple-peak shape was detected, which centered at between around 107 °C, 161 °C and 255 °Ccorresponding to highly dispersed CuO, bulk CuO particles and Cu 2 O. [27] For Catalyst Pt 0.01 Cu 0.1 Ce 0.45 Zr 0.45 O x and Catalyst Pt 0.01 Cu 0.2 Ce 0.4 Zr 0.4 O x , the reduction of highly dispersed CuO and Cu 2 O occurred at lower temperature, which is beneficial to the active H overflow of platinum. [13] 260 °C.…”

“…The peaks at 71.3 eV and 74.6 eV are attributed to Pt 0 , while the peaks at 72.6 eV and 75.9 eV are attributed to Pt 2 + . [27] After introducing copper into Pt 0.01 Ce 0.5 Zr 0.5 O x catalyst, the ratio of Pt 2 + content in the samples greatly shifted to above 70 %. With the increase of the amount of copper content below 0.1, the Pt 2 + ions on the surface of the catalysts gradually increased, which was due to the excellent oxygen transport capacity of highly dispersed CuO and the strong interaction between Pt with copper and Ce 0.5 Zr 0.5 O 2 supports, [39] making Pt 0 easily be affected by surface active oxygen and be oxidized to Pt 2 + , indicating higher redox ability and better catalytic activity.…”