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https://hdl.handle.net/1959.11/1593
Title: | Accurate low-pressure kinetics for isobutane oxidation over phosphomolybdic acid and copper(II) phosphomolybdates | Contributor(s): | Kendell, Shane (author); Brown, Trevor Colin (author) ; Burns, Robert C (author) | Publication Date: | 2008 | DOI: | 10.1016/j.cattod.2007.10.027 | Handle Link: | https://hdl.handle.net/1959.11/1593 | 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 BV | Place of Publication: | Netherlands | ISSN: | 1873-4308 0920-5861 |
Fields of Research (FoR) 2008: | 030601 Catalysis and Mechanisms of Reactions | Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
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Appears in Collections: | Journal Article |
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