Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/26413
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- Title
- The storage of nitrogen oxides on alumina-supported barium oxide
- Related
- Catalysis today, Vol. 73, Issue 3-4, p.271-278
- DOI
- 10.1016/S0920-5861(02)00010-X
- Publisher
- Elsevier
- Date
- 2002
- Author/Creator
- Cant, Noel W
- Author/Creator
- Patterson, Michael J
- Description
- The storage and release of NO₂ on alumina-supported barium oxide has been studied with particular attention to the stoichiometry of the two processes. At 400 °C the storage process is characterised by a short period of complete uptake, possibly as nitrito or nitro species, followed by a slower partial uptake in which approximately one NO is released for every three NO₂ lost. The latter reaction appears to supply the oxygen necessary to store NO₂ as nitrate ions. Molecular O₂ has little direct involvement even if in large excess. The second storage reaction also occurs, but to a much lesser extent, with Al₂O₃ alone. During temperature programmed desorption, release of NOₓ from Al₂O₃ peaks at ~430 °C with evolution of NO₂ and some O₂. Release from BaO/Al₂O₃ exhibits an additional peak near 520 °C corresponding to formation of NO and a higher O₂ concentration. The NO may arise from NO₂ since BaO/Al₂O₃ has activity for NO₂ decomposition by 500 °C. Although CO₂ at low concentration is rapidly taken up by BaO/Al₂O₃ at 400 °C it is displaced by NO₂ and does not interfere with storage. Thermodynamic calculations show that the formation of Ba(NO₃)₂ by the reaction of NO₂ with bulk BaCO₃ under the conditions used here is more favourable above 380 °C if NO is evolved than if O₂ is consumed.
- Description
- 8 page(s)
- Subject Keyword
- NO₂
- Subject Keyword
- storage catalysts
- Subject Keyword
- barium oxide
- Subject Keyword
- barium carbonate
- Subject Keyword
- aluminium oxide
- Subject Keyword
- decomposition of stored nitrate
- Resource Type
- journal article
- Organisation
- Macquarie University. Dept. of Chemistry and Biomolecular Sciences
- Identifier
- http://hdl.handle.net/1959.14/26413
- Identifier
- ISSN:1873-4308
- Identifier
- mq-rm-2002014951
- Language
- eng
- Reviewed
