Autor(es):
Paula, Alex Silva [UNESP] ; Possato, Luiz Gustavo [UNESP] ; Ratero, Davi Rubinho [UNESP] ; Contro, Janine [UNESP] ; Keinan-Adamsky, Keren ; Soares, Ricardo Reis ; Goobes, Gil ; Martins, Leandro [UNESP] ; Nery, José G. [UNESP]
Data: 2018
Identificador Persistente: http://hdl.handle.net/11449/173107
Origem: Oasisbr
Assunto(s): Acrylic acid; Glycerol; Mars-van Krevelen mechanism; Oxidehydration reactions; Vanadosilicates; Acrylic acid; Acrylic acid; Glycerol; Glycerol; Mars-van Krevelen mechanism; Mars-van Krevelen mechanism; Oxidehydration reactions; Oxidehydration reactions; Vanadosilicates; Vanadosilicates
Descrição
Made available in DSpace on 2018-12-11T17:03:40Z (GMT). No. of bitstreams: 0 Previous issue date: 2016-09-15
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Vanadosilicates isostructural to ETS-10 and AM-6 microporous materials were synthesized hydrothermally using derivatives of cis- and trans-3,5-dimethyl-piperidine as organic structure directing agents (SDAs) and were subsequently tested as heterogeneous catalysts for the oxidehydration of glycerol to acrylic acid. The best performances were obtained with vanadosilicates prepared with 1,1,3,5-tetramethyl piperidinum cations, which were capable of converting 93.6% of glycerol to acrylic acid in one step, with 85.4% selectivity. Other important chemicals such as acrolein (3.8%), propanal (2.3%), acetaldehyde (3.2%), acetic acid (2.5%), and propionic acid (1.4%) were produced in smaller amounts. The results clearly indicated that these vanadosilicates are potential multifunctional catalysts capable of performing the oxidehydration of glycerol to acrylic acid in a single step. Spectroscopic data obtained from 51VMAS-NMR, UV-Vis, XPS, and Raman scattering analyses suggested that the selectivity of these vanadosilicates for the oxidative dehydration of glycerol to acrylic acid could be attributed to the capacity of the vanadium species for dynamic adoption of multiple oxidation states during the catalytic reaction.
Department of Physics IBILCE State University of São Paulo - UNESP
Institute of Chemistry State University of São Paulo - UNESP
Department of Chemistry Bar-Ilan University
Federal University of Uberlândia
Department of Physics IBILCE State University of São Paulo - UNESP
Institute of Chemistry State University of São Paulo - UNESP
CNPq: #07/478104-3
