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The interaction between carbon monoxide and yttrium barium copper oxide, YBa2Cu3Ox, as studied by TG/DTA, FTIR, and XPS

The interaction of CO with YBa[sub 2]Cu[sub 3]O[sub x] (x [approximately] 7) has been studied using differential thermal analysis (DTA)/thermogravimetry (TG), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). The interaction at temperatures between 400 and 800 K proceeds as CO + O(lattice) = CO[sub 2], as shown by the evolved gas analysis and DTA/TG calorimetric measurement. At 800-1200 K a large CO uptake is observed, resulting in the formation of BACO[sub 3], which is characterized by FTIR, and the reduction of Cu(II) and Y(III), as observed by XPS. An apparent activation energy of 16 kcal/mol and a heat of reaction of 60 kcal/mol are estimated for this high-temperature reaction from the DTA/TG studies. These results are compared with those obtained for YBa[sub 2]Cu[sub 3]O[sub y] (y [approximately] 6) and the composite compounds, CuO, Y[sub 2]O[sub 3], and BaCO[sub 3]. A detailed mechanism which may explain the higher catalytic activity on YBa[sub 2]Cu[sub 3]O[sub x] than on CuO[sub 3] is suggested.