- Title
- Accurate low-pressure kinetics for isobutane oxidation over phosphomolybdic acid and copper(II) phosphomolybdates
- Creator
- Kendell, Shane M.; Brown, Trevor C.; Burns, Robert C.
- Relation
- Catalysis Today Vol. 131, Issue 1-4, p. 526-532
- Publisher Link
- http://dx.doi.org/10.1016/j.cattod.2007.10.027
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2008
- Description
- A low-pressure steady-state technique has been used to investigate the rates and mechanisms of the oxidation of isobutane over H₃[PMo₁₂O₄₀], CuH₄[PMo₁₂O₄₀]₂, Cu₂H₂[PMo₁₂O₄₀]₂, Cu₂.₅H[PMo₁₂O₄₀]₂, and Cu₃[PMo₁₂O₄₀]₂. Observed oxidation products over all catalysts are methacrolein, 3-methyl-2-oxetanone, acetic acid, carbon dioxide and water. The most selective catalyst for methacrolein formation at low temperatures (<496°C) is Cu₂.₅H[PMo₁₂O₄₀]₂, where both Cu(II) reduction and acid sites play a role. The least active catalyst at low temperatures is phosphomolybdic acid followed by Cu₃[PMo₁₂O₄₀]₂. This activity is reversed at higher temperatures. The 3-methyl-2-oxetanone is a unique product and is likely to be the precursor to methacrylic acid. Acetic acid is also probably a precursor to complete oxidation. Catalyst deactivation or restructuring is significant only over H₃[PMo₁₂O₄₀].
- Subject
- kinetics; cracking; oxidation; molecular flow; isobutane; methacrolein; phosphomolybdic acid; 3-Methyl-2-oxetanone
- Identifier
- uon:5049
- Identifier
- http://hdl.handle.net/1959.13/42910
- Identifier
- ISSN:0920-5861
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