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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) ; 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||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||Statistics to Oct 2018:||Visitors: 162
|Appears in Collections:||Journal Article|
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