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Citation: Deng Jing-Fa, Peng Ying, Jiang An-Ren, Wang Zhi-Hong. The Catalytic Oxidation of Co Over Ba_2-xSr_xYCu₃O_7-a[J]. Acta Physico-Chimica Sinica, ;1993, 9(02): 206-210. doi: 10.3866/PKU.WHXB19930212 shu

The Catalytic Oxidation of Co Over Ba_2-xSr_xYCu₃O_7-a

1.
Chemistry Department, Fudan University, Shanghai 200433

Received Date: 24 December 1991
Available Online: 15 April 1993

High temperature oxide superconducters Ba_(2-x)Sr_xYCu_3O_(7-a) (x=0, 0.25, 0.50, 0.75, 1.0, 1.25) was prepared using high purity BaCO_3, SrCO_3, Y_2O_2, CuO. The super-conducting transition temperature (T_c) of the samples was measured by the four-probe technique for resistivity and alternative current method for magnetic suscepti-bility. The properties of the superconductots were examined by using powder XRD method, EXAFS, laser Raman spectroscopy, TG and high vacuum mass spectroscopy TPD. The amount of substitution x is larger, the T_c is lower, the lattice parameters a, b, c and V are smaller and the occupation of oxygen is lower. The catalytic activity of these oxides for CO oxidation was also detected by continuous flow system at 1 atm. The easier released oxygen of these oxides O_I, the most active oxygen in the lattice, is the active center in catalytic oxidation by CO. The reaction mechnism is the same as that of Ba_2YCu_3O_(7-δ). Furthermore, there is a linear relationship between the catalytic activity and the amount of O_I.
- Ba_2-xSr_xYCu₃O_7-a superconduction catalysts; CO; Catalytic oxidation
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The Catalytic Oxidation of Co Over Ba_2-xSr_xYCu₃O_7-a