Activated carbon supported PdCo catalysts of 10-4 wt.-% Pd and 0-6 wt.-% Pd and 0-6 wt.-% Co loading were examined by hydrogen chemisorption, electrochemical polarization, transmission electron microscopy (TEM) and X-ray diffraction (XRD) methods. Unreduced cobalt or cobalt-rich phases raised difficulties in the determination of real (conventional) dispersion. Apparent dispersion (number of active surface sites/total number of metal atoms) was calculated from hydrogen chemisorption or electrochemical polarization data. Apparent dispersion was used for the interpretation of reaction rates in the liquid phase hydrogenation of propionitrile or benzaldehyde.
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