title: Dehydration of glycerol over niobia-supported silicotungstic acid catalysts.
abstract: Liquid-phase dehydration of glycerol to acrolein over nanosized niobia-supported silicotungstic acid catalysts was performed to investigate the effect of the silicotungstic acid loading on the catalytic performance of the catalysts. The catalysts were prepared by following an impregnation method with different HSiW loadings in the range of 10-50 wt%. The prepared catalysts were characterized by N2 physisorption, XRD, FT-IR, TPD of ammonia, and TGA. Dehydration of glycerol was conducted in an autoclave reactor under the conditions of controlled reaction temperatures under corresponding pressure. Increasing HSiW loading rapidly increased the acidity of HSiW/Nb205 catalyst and rate of glycerol conversion, but acrolein selectivity decreased due to enhanced deactivation of the catalyst by carbon deposit. Consequently, it was confirmed that catalytic activity for the dehydration of glycerol to acrolein was dependant on the acidity of catalyst and can be controlled by HSiW loading.
authors: Department of Advanced Chemicals and Engineering and Center for Functional Nano Fine Chemicals, Chonnam National University, Gwangju 500-757, Korea.
authors: Young Yi
authors: YY
authors: Lee
authors: Hye Jeong
authors: HJ
authors: Ok
authors: Dong Ju
authors: DJ
authors: Moon
authors: Jong Ho
authors: JH
authors: Kim
authors: Nam Cook
authors: NC
authors: Park
authors: Young Chul
authors: YC
authors: Kim
mesh_terms: D002384:Catalysis; D005990:Glycerol / Q000737:chemistry*; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D009556:Niobium / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D017973:Tungsten Compounds / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D017640:Silicates; D017973:Tungsten Compounds; D009556:Niobium; D014867:Water; C009495:titanium dioxide; D014025:Titanium; C021746:silicotungstic acid; D005990:Glycerol