“…[29] Over dehydrogenating catalysts, 1butanol transformsi nto two main products, butyraldehyde and 4-heptanone (ketonisation reaction), [30,31] and smaller amountso fh ydrocarbons, such as butene, heptene and 3methylheptane, as well as of other oxygenated compounds, such as 4-heptanol, dibutyl ether and butyl butyrate. [39,41] Acid catalysts for1 -butanold ehydration into butenes include heteropoly compounds, [42][43][44] AlPO 4 , [45,46] sulphated alumina, [47] hydroxyapatite, [48] Ta-montmorillonite and Ta /Si mixed oxides, [49,50] silica-alumina, [51] Al/Pa nd Al/Ga/P oxynitrides. [40] In the presence of oxygen, 1-butanol yields butyraldehyde by means of oxidehydrogenation.…”