Abstract
Several experiments were performed to provide convincing evidence for low temperature gallium reduction in a Ga 2O 3/HZSM-5 catalyst. XPS measurements showed the appearance of a Ga I signal after in situ hydrogen reduction at temperatures ranging between 373 and 673 K. No transfer of reduced gallium species from Ga 2O 3 to the zeolite particles was detected. A revision of the existing reduction mechanism is thus proposed. It is suggested here that the actual role of the HZSM-5 zeolite could be to provide a kind of activated hydrogen able to reduce Ga 2O 3.
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