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Title: Accurate low-pressure kinetics for isobutane oxidation over phosphomolybdic acid and copper(II) phosphomolybdates
Contributor(s): Kendell, Shane (author); Brown, Trevor Colin (author)orcid ; Burns, Robert C (author)
Publication Date: 2008
DOI: 10.1016/j.cattod.2007.10.027
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Abstract: 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].
Publication Type: Journal Article
Source of Publication: Catalysis Today, 131(1-4), p. 526-532
Publisher: Elsevier
Place of Publication: Amsterdam, The Netherlands
ISSN: 0920-5861
Field of Research (FOR): 030601 Catalysis and Mechanisms of Reactions
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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