Untitled

On the Role of Oxygen Defects in the Catalytic Performance of Zinc Oxide

“…[18,19] Sample (ZnO)V was prepared according to the literature. [10] Catalytic measurements were performed in a previously described flow setup [21] with six gas lines: He (99.9999 %), H 2 (99.9999 %), 2 % H 2 /He (H 2 : 99.9995 %), 1 % N 2 O/He (N 2 O: 99.9995 %), 10 % CO/He (CO: 99.9995 %), and synthesis gas. Two different synthesis gas mixtures (purity !…”

Chemisorption of N2O and H2 for the Surface Determination of Copper Catalysts

“…The setup allows the completion of temperature-and concentration-programmed experiments fully automatically and can be operated at pressures up to 60 bar [9]. The reactor consists of a glasslined U-tube with an inner diameter of 4 mm.…”

“…Complete saturation with atomic adsorbed hydrogen was achieved by dosing 50 Nml/ min H 2 at 1.5 MPa for 1 h [9]. Then, the sample was cooled down in H 2 to 78 K by means of liquid nitrogen.…”

“…on the specific Cu surface area determined. As a further independent method for the determination of Cu surface areas the temperature-programmed desorption of hydrogen (H 2 TPD) has been applied [8,9].…”

Rational Catalyst Design of Methanol Synthesis Catalysts

“…In a recent publication from our working group, similar phenomena were also found in a real Cubased catalyst under conditions close to those of the reaction. The measurement procedure comprised a combination of temperature-programmed desorption of H 2 (H 2 -TPD as an alternative method for determination of the copper surface area), N 2 O-RFC, and activity measurements [12]. Applying different pre-treatment strategies, a reversible dynamic behavior at the Cu/ZnO interface dependent on the oxidation or reduction potential of the gas phase was detected [13].…”