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• W2093032819 endingPage "844" @default.
• W2093032819 startingPage "835" @default.
• W2093032819 abstract "Abstract Glycerol upgrading to diglycerols in the presence of basic (Na + or Cs + ) ion‐exchanged (FAU or BEA) zeolite catalysts was studied in a liquid‐phase batch rector at 260 °C under normal pressure. Homogeneous NaHCO 3 and CsHCO 3 catalysts were studied for comparison. All the catalysts, including NaHCO 3 and CsHCO 3 , displayed the same conversion–selectivity relationship. The selectivity to linear diglycerols decreased at higher conversions/reaction times owing to the consecutive formation of higher oligomers, with preferential further conversion of α, α ′‐diglycerol. The maximum yield of linear diglycerols was limited to about 30 %. The activities of the zeolites followed the order X>Y>Beta, independent of the alkali ion present. Catalysis by the zeolites starts with an induction period attributed to a slow leaching of alkaline cations from the zeolite. Thereafter, the reaction is characterized by a progressive loss of the microporous structure of the zeolite and increasing overlap of heterogeneous and homogeneous catalysis, where, primarily, the activity depends on the cation content of the zeolite." @default.
• W2093032819 created "2016-06-24" @default.
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• W2093032819 date "2008-10-15" @default.
• W2093032819 modified "2023-09-29" @default.
• W2093032819 title "Glycerol Upgrading over Zeolites by Batch-Reactor Liquid-Phase Oligomerization: Heterogeneous versus Homogeneous Reaction" @default.
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• W2093032819 doi "https://doi.org/10.1002/cssc.200800128" @default.
• W2093032819 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18821560" @default.
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