Yi. Isakov et al., TRANSFORMATIONS OF BUTYRALDEHYDE IN THE PRESENCE OF CATALYSTS BASED ON LARGE-PORE MOLECULAR-SIEVES VPI-5 AND ALPO4-8, Russian chemical bulletin, 43(12), 1994, pp. 2004-2010
It is found that zeolite-like crystalline aluminophosphates VPI-5, Si-
VPI-5, and Mn-VPI-5 as well as those dirived from them, AlPO4-8, SAPO(
4)-8, and MnAPO(4)-8, are capable of catalyzing aldol condensation and
crotonization of butyraldehyde (BA). Pd/AlPO4-8 is catalytically acti
ve in hydrocondensation of BA with H-2 at atmospheric pressure. The ac
tivities in BA conversion to 2-ethylhexane-3-ol-1-al increase in the f
ollowing order: Mn-VPI-5 < Si-VPI-5 < VPI-5. The same order of activit
ies is also found for AlPO4-8, SAPO(4)-8, and MnAPO(4)-8. These cataly
sts are characterized by a lower initial activity in crotonization of
BA than M(+)NaX (CsNaX), but they are much more stable. Pd/AlPO4-8 cat
alyzes BA conversion to 2-ethylhexanal even in the absence of H-2 feed
to the reaction zone. The influence of catalyst pretreatments and exp
erimental conditions on the catalyst structures and catalytic activiti
es is discussed.