Abstract
Methanol (MeOH) conversion over a commercial Cu/ZnO/Al 2O 3 catalyst was investigated with different co-feed gas, namely, He, H 2, H 2O or O 2 from 423 to 573 K. In-situ XRD results indicate that oxidic Cu was mostly reduced during the MeOH conversion reactions, except in the presence of O 2, when the Cu state seems to depend on the pretreatment. The steady-state activity follows: MeOH + O 2 > MeOH > MeOH + H 2 > MeOH + H 2O. In the presence of H 2, a sequential H-abstraction of MeOH is indicated by the fact that formaldehyde (FAL) was produced at low MeOH conversion and CO dominated at high conversion. In the absence of H 2, no FAL was produced while CO dominated and some methyl formate (MF) was observed. Oxygen and water in the feed promoted CO 2 formation and suppressed the formation of CO and MF. A reaction scheme involving mainly H-abstraction and O-addition steps is proposed.
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