Produção Nacional
Revisado por pares
Acetalization of acetone with glycerol catalyzed by niobium-aluminum mixed oxides synthesized by a sol–gel process
2016; Elsevier BV; Volume: 422; Linguagem: Inglês
10.1016/j.molcata.2016.02.002
ISSN1873-314X
AutoresRaphael Rodrigues, Dalmo Mandelli, Norberto S. Gonçalves, Paolo P. Pescarmona, Wagner A. Carvalho,
Tópico(s)Catalytic Processes in Materials Science
ResumoNiobium-aluminum-based catalysts were synthesized by a sol–gel process and successfully applied to the reaction of acetalization of acetone with glycerol yielding 2,2-dimethyl-1,3-dioxolane-4-methanol (solketal) and 2,2-dimethyl-1,3-dioxan-5-ol. The synthesis procedure was developed using high-throughput techniques and the materials prepared with molar ratio1 Metal (1Nb:xAl): 100H2O: 1.5NH4OH (in which x = 1, 0.6, 0.3, 0.1 and 0.05) were selected to be further investigated. The obtained series of mixed oxides displayed high catalytic activity reaching glycerol conversion up to 84%, with 98% of selectivity towards solketal. The physicochemical properties of the investigated catalysts were characterized by N2-adorption/desorption, thermal analysis, X-rays diffraction, FTIR and Raman spectroscopy, and by adsorption of pyridine monitored by FT-IR spectroscopy and TGA. The catalysts are truly heterogeneous and can be reused in consecutive runs without loss of activity.
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