2016
DOI: 10.3390/catal6100151
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Binary Oxides with Defined Hierarchy of Pores in the Esterification of Glycerol

Abstract: Abstract:Various porous binary oxides with elevated textural properties were obtained in this work. The as-synthesized solids were calcined or modified by reflux and extraction processes. Characterizations through SEM, nitrogen physisorption and TEM techniques demonstrated the formation of porous metal oxide networks over all solids. XRD, thermal analyses and FTIR measurements showed the existence of nanosized rutile TiO 2 , tetragonal ZrO 2 , SiO 2 and γ-Al 2 O 3 phases on the solids. The structure and textur… Show more

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Cited by 16 publications
(10 citation statements)
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“…This clearly suggests that the aforesaid signals are consistent with the Al-O-Al vibrational modes in AlO6 octahedra [30,31]. Additional signals appearing at approximately 398, 499, 525, 612, 826, To prove this hypothesis, XRD patterns of the unsupported samples (Figure 2a) reveal no detectable differences for a γ-Al 2 O 3 sample, as found elsewhere [10,13,21]. It is supposed that the incorporation of the aforesaid basic oxides occurs because of the use of single-source alkoxy precursors, which form pre-existing Me-O-Al bonds via sol-gel chemistry process, where Al 3+ (50 pm) cations are replaced by larger La 3+ (105 pm), Zn 2+ (75 pm) or Mg 2+ (78 pm) during the synthesis [21,23,24].…”
Section: Structural Characterizationssupporting
confidence: 81%
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“…This clearly suggests that the aforesaid signals are consistent with the Al-O-Al vibrational modes in AlO6 octahedra [30,31]. Additional signals appearing at approximately 398, 499, 525, 612, 826, To prove this hypothesis, XRD patterns of the unsupported samples (Figure 2a) reveal no detectable differences for a γ-Al 2 O 3 sample, as found elsewhere [10,13,21]. It is supposed that the incorporation of the aforesaid basic oxides occurs because of the use of single-source alkoxy precursors, which form pre-existing Me-O-Al bonds via sol-gel chemistry process, where Al 3+ (50 pm) cations are replaced by larger La 3+ (105 pm), Zn 2+ (75 pm) or Mg 2+ (78 pm) during the synthesis [21,23,24].…”
Section: Structural Characterizationssupporting
confidence: 81%
“…reaction of glycerol in the presence of acetic acid (EG) becomes increasingly important for the direct use of glycerol to obtain more valuable products (Figure 1). Thus, the transformation of glycerol into glycerol esters (acetins) through the EG reaction is of commercial importance, since the obtained acetins are applied as emulsifiers, cosmetics, food additives, stabilizers, biofuels additives and pharmaceuticals [9][10][11]. This has boosted progress in the design of a variety of advanced catalytic materials towards the EG reaction, such as zeolites, resins, graphene oxide, metal oxides, amorphous and mesoporous sulfated silicas, hydroxyapatites and a diversity of supported oxides [1][2][3][4][5][6][7][11][12][13].…”
Section: Introductionmentioning
confidence: 99%
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“…Los mejores resultados se obtuvieron para el sólido SiAlR, alcanzando una alta selectividad a TAG. Estos resultados fueron atribuidos a la combinación de poros accesibles a los reactivos y productos, la estabilidad de la estructura y la alta acidez [155].…”
Section: Capítulounclassified
“…La eliminación de la molécula de agua conduce a la formación del MAG, y el mecanismo continúa secuencialmente para formar DAG y TAG [153]. Este mecanismo ha sido reportado también por otros autores, empleando sólidos con acidez tanto Brønsted como Lewis [107,111,138,153,155,[162][163][164][165].…”
Section: Esterificación De Glicerol Con áCido Acéticounclassified