β Scribed by F. Bauer; E. Geidel; W. Geyer; Ch. Peuker
No coin nor oath required. For personal study only.
The removal of carbonaceous deposits formed during the conversion of methanol to hydrocarbons on zeolite H-ZSM-5 was investigated in a thermobalance system coupled with an IR spectrometer. Using different carrier gases, the effect of thermal treatment increased in the order helium<hydrogen<propane. Up to 20% of the total amount of coke was released by the treatment with propane. The coke remaining on the zeolite is hydrogen-deficient in nature, as shown by temperature-programmed oxidation. The interaction of coke with molecular hydrogen was studied by H/D exchange. Furthermore, from isotope labelling, no evidence of carboxylate-like bonds between coke species and the zeolite surface was found.
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## Abstract Die BrΓ€unungsvorgΓ€nge sowie die Bildung von Carbonylverbindungen in Mehlteigen wurden unter definierten Temperaturβ und Feuchtigkeitsbedingungen untersucht. Die Ergebnisse zeigten, daΓ beide Reaktionen als Folgereaktionen ablaufen und sich prinzipiell in bezug auf den Feuchtigkeitsgehal