Abstract
The heterolytic dissociation of hydrogen is thought to constitute the hydrogen-activation step in the mechanism of methanol synthesis. No data have been reported until now for the adsorption of hydrogen on the high-temperature methanol synthesis catalysts based on Zn/Cr mixed oxides, with a Zn/Cr atomic ratio higher than 0.5. In the present communication results of an IR study of the adsorption of hydrogen and deuterium on stoichiometric (Zn/Cr = 0.5) and nonstoichiometric zinc-rich spinels (Zn/Cr = 0.6 and 1.0) are reported. X-ray diffraction (XRD) analysis of such samples indicates that all samples are monophasic, showing only the presence of the spinel-type phases. Furthermore, these samples were studied by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), with an energy dispersive X-ray analyzer (EDX), and the presence of particles containing only zinc was not found. 30 references.
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