Preparation of Rare Earch Comound Solid Acid Catalyst SO₄^2-/Ti-La-O and Investigation of Catalytic

The Rare Earch compound acid SO₄^2-/Ti-La-O is prepared. The esterification of pyromellitic deanhydride with 2-ethyl-hexyl alcohol is regard as a model reaction. This paper studied the effect of preparation conditions and catalyst surface structure on catalytic activity.
XRD spectra of catalyst reveals that the catalyst SO₄^2-/Ti-La-O is amorphous in calcination temperature 400℃～450℃,It is found by XPS spectra analysis that the state of atom is not fully identical with singl oxide, the polariging extent in metal atome is increased and the oxidation value of sulfide in suface of oxide is six. FT-IR indicates that SO₄^2- is combined with metal ions of catalysis in a bidentate state, the Bronsted acid site and Lewis acid site co-exist on the catalyst surface, and acid strength and catalyst are increased greatly by the Lacid and Bacid in cordination.