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Highly Efficient Glycerol Acetalization over Supported Heteropoly Acid Catalysts
Author(s) -
Chen Lin,
Nohair Bendaoud,
Zhao Dongyuan,
Kaliaguine Serge
Publication year - 2018
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201701656
Subject(s) - paraformaldehyde , chemistry , catalysis , acetone , glycerol , mesoporous material , selectivity , formaldehyde , reagent , yield (engineering) , reaction mechanism , prins reaction , organic chemistry , inorganic chemistry , materials science , metallurgy
The acetalization of glycerol with acetone to yield solketal was catalyzed by Cs 2.5 H 0.5 PW 12 O 40 (Cs2.5) supported on mesoporous silica under mild conditions. It gave a high glycerol conversion and selectivity to the targeted product even at room temperature (23 °C). We studied the use of both bulk and supported Cs2.5 as catalysts in another highly efficient glycerol acetalization reaction with paraformaldehyde, which gave much higher activity than with formaldehyde solution. For the reaction with acetone, the supported Cs2.5 showed a higher activity than the bulk material because of the high surface area of the mesoporous support. Interestingly, the supported Cs2.5 gave a lower conversion than the bulk for the reaction with paraformaldehyde. This is probably because of the high viscosity of the reaction system with the solid reagent paraformaldehyde. Overall, there is a complex relationship between catalyst, reaction conditions, which include the molar ratio of reactants and temperature, reaction mechanism and thermodynamics that affects the achieved activity and byproduct formation. A discussion about these interactions is included for each reaction.