Russian Chemical Bulletin p. 2004 - 2010 (1994)
Update date:2022-08-11
Topics:
Isakov, Ya. I.
Minachev, Kh. M.
Tome, R.
Tissler, A.
Oehlmann, G.
et al.
It was found that zeolite-like ctystalline aluminophosphates VPI-5, Si-VPI-5, and Mn-VPI-5 as well as those derived from them, AlPO4-8, SAPO4-8, and MnAPO4-8, are capable of catalyzing aldol condensation and crotonization of butyraldehyde (BA).Pd/AlPO4-8 is catalytically active in hydrocondensation of BA with H2 at atmospheric pressure.The activities in BA conversion to 2-ethylhexane-3-ol-1-al increase in following order: Mn-VPI-5 < Si-VPI-5 < VPI-5.The same order of activities is also found for AlPO4-8, SAPO4-8, and MnAPO4-8.These catalysts are characterized by a lower initial activity in crotonization of BA than M+NaX (CsNaX), but they are much more stable.Pd/AlPO4-8 catalyzes BA conversion to 2-ethylhexanal even in the absence of H2 feed to the reaction zone.The influence of catalyst pretreatments and experimental conditions on the catalyst structures and catalytic activities is discussed. - Key words: butyraldehyde; condendation; crystalline aluminophosphates; molecular sieves; VPI-5; AlPO4-8; catalysis.
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