Zur Wirkung von Metallkomponenten auf die acide Funktion von Reformingkatalysatoren

The influence of typical metal components of reforming catalysts on their acidic properties was investigated by means of i.r. spectroscopie methods using ammonia as probe molecule. It was shown that metal components in high oxidation states lead to an increased Lewis acidity and a small rise in the strength of Bronsied acid cenires especially in the case of the modification with rhenium. This effect is removed by the reduction process probably caused by a partial electron transfer from metal to the acidic centres.