A comparison of the reactivity of {open_quotes}nonequilibrated{close_quotes} and {open_quotes}equilibrated{close_quotes} V-P-O catalysts: Structural evolution, surface characterization, and reactivity in the selective oxidation of n-butane and n-pentane
- Industriale e dei Materiali, Viale Risorgimento, Bologna (Italy); and others
Structural alteration as a result of thermal treatment of VOHPO{sub 4}{center_dot}4H{sub 2}O was studied. Calcination induces partial oxidization, resulting in a phase composed of an amorphous V{sup IV}-P mixed oxide and a crystalline hydrated V{sup V}-P-O phase. When left in a 1% hydrocarbon/air stream for 100 h leads to a{open_quotes}nonequilibrated{close_quotes} catalyst, and after 1000 h to the {open_quotes}equilibrated{close_quotes} catalyst. Catalytic activity of the nonequilibrated and equilibrated catalysts in n-butane and n-pentane oxidation was studied. The catalysts were structurally characterized by XRD, FT-IR, chemical analysis. TGA, XPS, and TPD. The equilibrated catalyst consisted of well crystallized (VO){sub 2}P{sub 2}O{sub 7} with homogeneously distributed surface sites. The nonequilibrated catalyst displayed mixed phases and nonhomogeneous surface sites. 38 refs., 18 figs., 2 tabs.
- OSTI ID:
- 447646
- Journal Information:
- Journal of Catalysis, Vol. 160, Issue 1; Other Information: PBD: 15 Apr 1996
- Country of Publication:
- United States
- Language:
- English
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