Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 220, Issue 2, Pages 215-220Publisher
ELSEVIER
DOI: 10.1016/j.molcata.2004.05.034
Keywords
Guerbet reaction; hydrotalcite; copper chromite; Mg/Al mixed oxides; isobutyl alcohol; methanol; n-propanol; aldol condensation
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The synthesis of isobutyl alcohol ((BuOH)-Bu-i) from methanol (MeOH) and n-propanol (PrOH) through the Guerbet condensation has been studied at 200 degreesC and under inert atmosphere (3.0 MPa of N-2) using a two-component heterogeneous catalytic system based on pre-activated copper chromite and Mg-Al mixed oxides deriving from hydrotalcite-type (HT) precursors with different Mg/Al ratios. All the investigated catalysts displayed a significant activity, with an almost complete selectivity to TuOH. Unlike the copper chromite/soluble sodium methoxide system, the catalysts were tolerant of the co-produced water and did not display any appreciable deactivation during the course of the reaction. The catalyst productivity was found to increase by reducing the Mg/Al ratio in the heterogeneous base, according to the increase of the fraction of medium-strong and strong basic sites which favour the aldol condensation between the aldehydes derived from MeOH and PrOH. (C) 2004 Elsevier B.V. All rights reserved.
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