Abstract
The metathesis reaction of terminal alkenes other than isobutene took place on MoO3–x/TiO2, whereas that of isobutene proceeded in the presence of ethylene and following treatment of the catalyst with SnMe4 at room temperature. These results infer that chain-carrying CH2 species are generated to only a small extent by the adsorption of isobutene on MoO3–x/TiO2, although they are formed by the adsorption of alk-1-enes and SnMe4. The metathesis-inactive material, fully oxidized MoO3/TiO2, was changed to a metathesis-active catalyst by treating it with SnMe4. This suggests that MoO3/TiO2 has no ability to yield CH2 species with terminal alkenes but that these species can be supplied with SnMe4. An analysis by X-ray photolectron spectroscopy infers that SnMe4 adsorbed on MoO3/TiO2 releases methyl groups concomitant with the oxidation of Sn.
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