Oxidation of o-xylene to phthalic anhydride over V{sub 2}O{sub 5}/TiO{sub 2} catalysts. III. Study of organic residue formed on the catalyst surface
- Grupo de Estudos de Catalise Heterogeneca, Lisboa Codex (Portugal)
- Brunel Univ., Uxbridge, Middlesex (United Kingdom)
An organic residue is formed on V{sub 2}O{sub 5}/TiO{sub 2} (antase) catalysts during the oxidation of o-xylene and o-tolualdehyde. V{sub 2}O{sub 5} catalysts supported on TiO{sub 2} (0.6, 1, and 5% V{sub 2}O{sub 5}/TiO{sub 2}), prepared by wet impregnation, were exposed to o-xylene/air and o-tolualdehyde/air mixtures under different operating conditions, and, after different times of exposure to reaction conditions, the catalysts were characterized by FTIR spectroscopy and temperature programmed oxidation. The compounds formed were also extracted and analyzed by mass spectrometry. Organic molecules containing no more than two aromatic rings, formed by dimerization of adsorbed molecules, were detected and their characteristics were found to vary with features of the catalytic surface and with operating conditions. Larger contents of residue were obtained at lower temperatures and lower contact times and, for some experimental conditions, a constant amount of such compounds was observed after 1 h of exposure under reaction conditions. The analysis of samples used with different reactant mixtures showed that adsorbed o-xylene can lead to the formation of a {open_quotes}residue{close_quotes} on the surface. 35 refs., 7 figs., 1 tab.
- OSTI ID:
- 494280
- Journal Information:
- Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 2 Vol. 162; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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