%0 Journal Article
%T Oxidative dehydration of glycerol to acrylic acid over vanadium-impregnated zeolite beta
%A Pestana
%A Carolina F. M.
%A Guerra
%A Ant£¿nio C. O.
%A Ferreira
%A Glaucio B.
%A Turci
%A C¨¢ssia C.
%A Mota
%A Claudio J. A.
%J Journal of the Brazilian Chemical Society
%D 2013
%I Sociedade Brasileira de Qu¨ªmica, SBQ
%R 10.1590/S0103-50532013000100014
%X the oxidative dehydration of glycerol to acrylic acid was studied over vanadium-impregnated zeolite beta. catalysts were prepared by wet impregnation of ammonium metavanadate over ammonium-exchanged zeolite beta, followed by air calcination at 823 k. impregnation reduced the specific surface area, but did not significantly affected the acidity (br£¿nsted and lewis) of the zeolites. the catalytic evaluation was carried out in a fixed bed flow reactor using air as the carrier and injecting glycerol by means of a syringe pump. acrolein was the main product, with acetaldehyde and hydroxy-acetone (acetol) being also formed. acrylic acid was formed with approximately 25% selectivity at 548 k over the impregnated zeolites. the result can be explained by xps (x-ray photoelectron spectroscopy) measurements, which indicated a good dispersion of the vanadium inside the pores.
%K glycerol
%K acrylic acid
%K zeolite
%K dehydration
%K oxidation.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0103-50532013000100014&lng=en&nrm=iso&tlng=en