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Secondary ketonization of primary alcohol over LaMn-based mixed oxides with perovskite-like structure

Paper ID Volume ID Publish Year Pages File Format Full-Text
42970 45949 2009 6 PDF Available
Title
Secondary ketonization of primary alcohol over LaMn-based mixed oxides with perovskite-like structure
Abstract

LaMnO3-based mixed oxides with perovskite-like structure both bulk and supported on La–Al2O3, show high catalytic activity in dehydrogenation of n-butanol to an aldehyde, which then undergoes a secondary reaction to produce a symmetrical ketone. Partial substitution of Cu, V or Sr into LaMnO3 structure does not destroy the perovskite-like structure and enables to control the acid–base surface properties. It allows linking up these qualitative and quantitative features with activity and selectivity of these materials. The degree of n-butanol conversion depends on the total concentration of basic and acidic sites. Selectivity to butyraldehyde can be related with the share of basic sites. Selectivity to dipropyl ketone is affected both by the acidity and concentration of acidic sites. LaMnO3/La–Al2O3 seems to posses an optimum set of surface characteristics for the examined ketonization of a primary alcohol.

Graphical abstractBinary mixed oxide LaMnO3 with perovskite-like structure, bulk and supported on La–Al2O3, dehydrogenate n-butanol to an aldehyde which undergoes a secondary reaction to produce a symmetrical ketone. Incorporation of Cu, V or Sr into LaMnO3 structure enables to control the acid–base surface properties. The degree of n-butanol conversion depends on the total concentration of basic and acidic sites. Selectivity to butyraldehyde depends on the share of basic sites. Selectivity to dipropyl ketone can be related both with the share and concentration of acidic sites.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Lanthanum manganite; Perovskite; Basic sites; Acidic sites; Primary alcohol; Ketonization
First Page Preview
Secondary ketonization of primary alcohol over LaMn-based mixed oxides with perovskite-like structure
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 360, Issue 2, 1 June 2009, Pages 199–204
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis