01923nas a2200241   4500008004100000022001400041245015200055210006900207260000900276300001400285490000700299520108500306653001301391653002501404653001301429653002401442653001401466100001901480700002801499700002301527700000501550856012601555       2020                        eng d  a2470-155600aSynthesis and characterization of supported heteropoly acid: efficient solid acid catalyst for glycerol esterification to produce biofuel additives0 aSynthesis and characterization of supported heteropoly acid effi  cNOV   a1157-11650 v503 a<p>Esterification of glycerol with acetic acid has been studied with different solid acid catalysts, prepared by impregnating phospotungustic, silicotungstic, and phosphomolybdic acids on polymeric material polyvinylpyrrolidone. These results were compared with commercially available montmorillonite KSFO catalyst showed that PVP-DTP gave higher selectivity to di- and triacetins. This study was mainly focused on increasing the selectivity toward triacetin which is an excellent alternative to fossil fuel based fuel additives. The detail characterization was done for the PVP-DTP catalyst which gave complete conversion of glycerol and maximum selectivity of 34% toward triacetin. Complete conversion of glycerol was achieved at 110 degrees C within 6 h of reaction time. The characterization of the catalyst was performed by SEM/EDX, X-ray diffraction, thermogravimetic techniques, and FT-IR analysis.TPD-NH3 characterization showed that DTP supported on PVP increases the catalyst acidity of PVP. The highest acidity of PVP-DTP is also confirmed using NH3-TPD analysis.</p>
10aGlycerol10aphospostugustic acid10apovidone10asolid acid catalyst10atriacetin1 aMagar, Subhash1 aMohanraj, Govindraj, T.1 aJana, Sumit, Kumar1 a  uhttps://library.ncl.res.in/content/synthesis-and-characterization-supported-heteropoly-acid-efficient-solid-acid-catalyst