Promotion of low-temperature oxidation of CO over Pd supported on titania-coated ceria

作者：Satsuma Atsushi^*; Yanagihara Masatoshi; Osaki Kaoru; Saeki Yurina; Liu Heng; Yamamoto Yuta; Arai Shigeo; Ohyama Junya

来源：RSC Advances, 2014, 4(97): 54187-54193.

DOI：10.1039/c4ra10167g

The design of a metal oxide support for Pd was investigated to promote the oxidation of CO at lower temperatures. Through a screening study using pure metal oxides, Pd/CeO2 showed the highest activity above 100 degrees C, while homemade TiO2 was more effective below 100 degrees C as a support for Pd. Applying the advantages of CeO2 and TiO2, we proposed a TiO2-CeO2 support having a monolayer amount of surface TiO2 supported on CeO2. The Pd/TiO2-CeO2 catalyst showed higher activity than both Pd/TiO2 and Pd/CeO2, which was not achieved by using the CeO2-TiO2 mixed-oxide. The light-off temperature over Pd/TiO2-CeO2 was 100 degrees C lower than Pd/Al2O3. The effect of surface TiO2 was attributed to the promotion of the reduction-oxidation cycle of supported Pd.

• 出版日期2014