The spinel type chromites MCr 2O 4 (M = Co, Ni and Cu) were synthesized by the co-precipitation method and have been characterized by a number of analytical tools. The efficacy of the synthesized system as catalysts for the oxidation of benzyl alcohol by molecular oxygen has been studied wherein it has been observed that benzaldehyde is formed with 100% selectivity. The catalytic activity of the chromites follows the order Co &gt; Ni &gt; Cu. The effect of the reaction parameters like the amount of the catalyst and reaction time was studied and it has been observed that the surface area and chemical hardness of the catalysts play a significant role. © 2012 Elsevier B.V. All rights reserved.

Balasubramanian Viswanathan

Analytical tool

benzyl alcohol

CHEMICAL HARDNESS

Coprecipitation method

Liquid-phase oxidation

REACTION PARAMETERS

Selective Oxidation

spinel

SPINEL-TYPE

surface area

Aldehydes

Catalyst selectivity

CHROMITE

oxidation

CHROMITE DEPOSITS

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Applied Catalysis A: General

Selective oxidation and dehydrogenation of benzyl alcohol have been carried out on ABB′O3 (A=Ba, B=Pb, Ce, Ti and B′=Bi, Cu, Sb)-type perovskite oxides in the absence and in the presence of oxygen. Partial reduction of the catalyst is observed when the reaction is carried out in the absence of oxygen or at low partial pressures of oxygen. Reduced catalysts were characterised by XRD. Temperature-programmed reduction studies were carried out to determine the reducibility of the catalyst. Catalytic activity is found to depend on the reducibility of the catalysts. Copper-containing perovskites are highly reducible and BaTiO3 and BaCeO3 are the least reducible. Catalytic activity and reducibility are correlated with the metal-oxygen bonding as well as free energy of reduction of B site cations. A mechanism is proposed, which explains the ratio of benzaldehyde to toluene based on the reducibility. © 1998 Elsevier Science B.V. All rights reserved.

Selective oxidation and dehydrogenation of benzyl alcohol on ABB′O3 (A=Ba, B=Pb, Ce, Ti and B′=Bi, Cu, Sb)-type perovskite oxides-temperature programmed reduction studies

React. Chem. Eng.

Back cover

Catalysis Today

Catalytic combustion of methane over cerium-doped cobalt chromite catalysts

Progress in Solid State Chemistry

Electronic properties of oxides: Chemical and theoretical approaches

ChemCatChem

Gas-Phase Selective Oxidation of Benzyl Alcohol to Benzaldehyde with Molecular Oxygen over Unsupported Nanoporous Gold

Liquid phase oxidation of benzyl alcohol with molecular oxygen catalyzed by metal chromites

Journal	Applied Catalysis A: General
ISSN	0926860X
Open Access	No