abstract
The solvent-free acetalization of glycerol with acetone was investigated using as catalyst UAV-59, a Coordination Polymer based on nitrilo(trimethylphosphonic acid) and Gd3+, at 25 degrees C and 55 degrees C, with various glycerol/acetone (Gly/Ace) molar ratios. The reaction yielded solketal, a five-membered acetal, and 2,2-dimethyl-1,3-dioxan-5-ol, a six-membered acetal. UAV-59's catalytic activity was influenced by temperature, with the highest conversion (94%) achieved at 55 degrees C, a 1/10 Gly/Ace ratio, and 5% catalyst. The selectivity for solketal remained consistent (95-98%) across all conditions. Reaction kinetics and selectivity profiles were compared, catalyst stability was assessed, and results were benchmarked against Metal Organic Framework catalysts from the literature. The heterogeneous nature of catalysis was confirmed through leaching tests, and the catalyst's chemical features were analyzed using ATR FT-IR spectra and X-ray diffraction patterns, indicating that UAV-59's crystalline structure was preserved during the reaction.
keywords
WALL CARBON NANOTUBES; BLOCK-COPOLYMERS; SOLKETAL; ANALOGS; LIPASE
subject category
Chemistry; Engineering
authors
Santos-Vieira, ICMS; Mendes, RF; Paz, FAA; Rocha, J; Simoes, MMQ
our authors
Filipe Alexandre Almeida Paz
Principal Researcher
Isabel Cristina Maia da Silva Santos Vieira
Junior Researcher
João Rocha
Full Professor
Ricardo Faria Mendes
Junior ResearcherProjects
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
acknowledgements
This work received financial support from PT national funds (FCT/MCTES, Fundacao para a Ciencia e Tecnologia and Ministerio da Ciencia, Tecnologia e Ensino Superior (PIDDAC) ) through the CICECO-Aveiro Institute of Materials (UIDB/50011/2020, UIDP/50011/2020 and LA/P/0006/2020) and for the LAQV-REQUIMTE (UIDB/50006/2020 and UIDP/50006/2020) . The position held by I.C.M.S.S.V. (Ref. 197_97_ARH-2018) was funded by national funds (OE) , through FCT, I. P., in the scope of the framework contract foreseen in the numbers 4, 5 and 6 of article 23 of the Decree-Law 57/2016 of 29 August, changed by Law 57/2017 of 19 July. R.F.M. gratefully ac-knowledges FCT for a Junior Research Position (CEECIND/00553/2017) .