The construction of stable active site in nanocatalysts is of great importance but is a challenge in heterogeneous catalysis. Unexpectedly, coordination-unsaturated and atomically dispersed copper species were constructed and stabilized in a sintered copper-ceria catalyst through air-calcination at 800 degrees C. This sintered copper-ceria catalyst showed a very high activity for CO oxidation with a CO consumption rate of 6100 mu mol(CO).g(Cu)(-1).s(-1) at 120 degrees C, which was at least 20 times that of other reported copper catalysts. Additionally, the excellent long-term stability was unbroken under the harsh cycled reaction conditions. Based on a comprehensive structural characterization and mechanistic study, the copper atoms with unsaturated coordination in the form of Cu1O3 were identified to be the sole active site, at which both CO and O-2 molecules were activated, thus inducing remarkable CO oxidation activity with a very low copper loading (1 wt %).
[1]Shandong Univ, Sch Chem & Chem Engn, Key Lab Special Aggregated Mat, Key Lab Colloid & Interface Chem, Jinan 250100, Shandong, Peoples R China.
[2]Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China.
[3]Chizhou Univ, Dept Chem & Mat Engn, Chizhou 247000, Peoples R China.
[4]Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.
[5]Peking Univ, PKU HKU Joint Lab Rare Earth Mat & Bioinorgan Che, State Key Lab Rare Earth Mat Chem & Applicat, Beijing Natl Lab Mol Sci, Beijing 100871, Peoples R China.
[6]Lanzhou Univ, Coll Chem & Chem Engn, Lanzhou 730000, Gansu, Peoples R China.
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