Factors influencing structure and catalytic activity of Au/Ce1−xZrxO2 catalysts in CO oxidation

Ceria-zirconia supported gold catalysts

“…Moreover, Au catalysts appeared to be much more active than the other noble metal catalysts at temperatures below 130°C [2,5]. However, only a few papers have reported the study of Au supported on ceria-zirconia as catalysts for low-temperature CO oxidation [17][18][19][20][21][22][23].…”

“…He reaction gas mixture, with a flow of 50 cm 3 .min -1 , in the temperature range 25-300 0 C, with a ramp rate 5 0 C.min -1 . The effect of the preparation procedure on some physicochemical properties of Au/Ce 1-x Zr x O 2 (x= 0.25, 0.5, 0.75) catalysts is presented in Table 3 (in details described in [21]). The catalysts as prepared (without washing) showed real Au content almost identical to the nominal one (2 wt.%).…”

“…Dobrosz-Gómez et al [21] studied in details the correlations between structural, redox and catalytic properties of Au/Ce 1-x Zr x O 2 catalysts prepared using different synthesis procedures. A special attention was paid to the influence of residual chlorine in the catalysts on their properties and catalytic performance in CO oxidation.…”

“…3. Characterization data of Au/Ce 1-x Zr x O 2 (x = 0.25, 0.5, 0.75) catalysts obtained using various physicochemical techniques (in details described in [21] Determined by: a AAS, b TPR -CO studies: T 0 -the temperature at which catalysts reduction starts (the initial reduction temperature), Peak I, II and III -the temperatures at which catalysts reduction occurs (the temperatures of the maxima of the reduction peaks), CO 2 formation -the total quantity of CO 2 formed during the reduction process, c Catalytic tests (T 10 , T 50 and T 90 -the temperature for 10%, 50% and 90% CO conversion was obtained). /Au -were significantly higher for the catalysts prepared without washing than for those washed with ammonia.…”

“…Such unique properties of ceria-zirconia systems seem to make them ideally suited for an application as supports to gold catalysts. Surprisingly, only a few papers concerning Au/Ce x Zr 1-x O 2 catalysts [7,[9][10][11][12][13][14][15][16][17][18][19][20][21][22][23], tested mainly in the water-gas shift reaction [9][10][11][12][13][14][15][16] and low-temperature CO oxidation [10,[17][18][19][20][21][22][23] have been published so far. In this paper the most important achievements and conclusions coming from these contributions have been reviewed.…”