Gas-phase conversion of glycerol over mixed metal oxide
catalysts  Catalysis in Industry 04/2012; 3(1):70-75.
DOI:10.1134/S2070050411010132  ABSTRACT A series of
aluminophosphates (APO) catalysts with Ce, Cu, Cr, Fe, Mn, Mo,
V, and W oxide loading at a constant ratio M: Al = 1: 10 and
PO4: Al = 1: 12 were prepared and characterized by N2
physisorption, XRD and NH3-TPD. Gas-phase dehydration of
glycerol to produce acrolein and acetol was investigated at
280°C in presence of water. Conversion and product distribution
depended on the intrinsic acidity and the type of transition
metal oxide. Best selectivity to acrolein (52–58%) was obtained
for W- und Mo-APO catalysts. Cr-, Mn- and W- oxide containing
catalysts enhanced the formation of phenol, acetaldehyde and CO
. The catalysts containing V- and Fe-oxide promoted the
formation of allyl alcohol. All catalysts showed long term
stability, which can be attributed to the redox ability of the
metal oxides that enhances the removal of coke deposits. The
investigated