caa a22 4500 475844726 CHVBK 20180406123910.0 cr unu---uuuuu 170329e20000301xx s 000 0 eng 10.1023/A:1019124419791 doi (NATIONALLICENCE)springer-10.1023/A:1019124419791 High catalytic activity of PdOx/MnO2 for CO oxidation and importance of oxidation state of Mn [Elektronische Daten] [Jong Park, Dong Doh, Kwan‐Young Lee] PdOx/MnO2 has been examined as a catalyst for CO oxidation using a conventional flow reactor at reaction temperatures between 50 and 150°C. In the reaction conditions of GHSV (gas‐hourly‐space‐velocity) of 1.22 × 105/h and CO concentration of 2000 ppm, PdOx/MnO2 showed higher catalytic activity compared with PdOx/Mn2O3, which had been previously reported as an effective catalyst due to the cooperative action of Pd and Mn2O3 for this reaction. The reason for higher activity of PdOx/MnO2 than PdOx/Mn2O3 has been investigated using TPR (temperature‐programmed reduction) and XPS studies. TPR showed that PdOx/MnO2 could be reduced by CO at much lower temperature than PdOx/Mn2O3. During the experiment of reduction and oxidation, XPS showed that the valence of Mn in the PdOx/MnO2 was between 4+ and 3+, which is higher than that of Mn in the PdOx/Mn2O3 catalyst of which the valence has been reported to be between 3+ and 2+. It is known that in this catalyst system the support supplies oxygen onto Pd, where the oxidation occurs with adsorbed CO, and the ability of the support to provide oxygen improves the performance of the catalyst. Therefore, it was concluded that the readiness of MnO2 to be reduced with maintaining a higher oxidation state showed higher CO oxidation activity than Mn2O3 as support for PdOx. Kluwer Academic Publishers, 2000 CO oxidation nationallicence PdOx/MnO2 nationallicence redox properties nationallicence Park Jong Department of Chemical Engineering, Korea University 1, 5‐ka, Anam‐dong, Sungbuk‐ku, 136‐701, Seoul, Korea aut Doh Dong Department of Chemical Engineering, Korea University 1, 5‐ka, Anam‐dong, Sungbuk‐ku, 136‐701, Seoul, Korea aut Lee Kwan‐Young Department of Chemical Engineering, Korea University 1, 5‐ka, Anam‐dong, Sungbuk‐ku, 136‐701, Seoul, Korea aut Topics in Catalysis Kluwer Academic Publishers-Plenum Publishers 10/1-2(2000-03-01), 127-131 1022-5528 10:1-2<127 2000 10 11244 https://doi.org/10.1023/A:1019124419791 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1019124419791 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Park Jong Department of Chemical Engineering, Korea University 1, 5‐ka, Anam‐dong, Sungbuk‐ku, 136‐701, Seoul, Korea aut NATIONALLICENCE 700 1- Doh Dong Department of Chemical Engineering, Korea University 1, 5‐ka, Anam‐dong, Sungbuk‐ku, 136‐701, Seoul, Korea aut NATIONALLICENCE 700 1- Lee Kwan‐Young Department of Chemical Engineering, Korea University 1, 5‐ka, Anam‐dong, Sungbuk‐ku, 136‐701, Seoul, Korea aut NATIONALLICENCE 773 0- Topics in Catalysis Kluwer Academic Publishers-Plenum Publishers 10/1-2(2000-03-01), 127-131 1022-5528 10:1-2<127 2000 10 11244 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer