Synthesis and characterization of chromium silicate catalyst and its application in the gas phase glycerol transformation into acetaldehyde

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.creatorLuizon Filho, Roberto A. [UNESP]-
Autor(es): dc.creatorPossato, Luiz G. [UNESP]-
Autor(es): dc.creatorSantisteban, Oscar A.N. [UNESP]-
Autor(es): dc.creatorde Vasconcellos, Adriano [UNESP]-
Autor(es): dc.creatorda Silva, Danilo A. [UNESP]-
Autor(es): dc.creatorLima, Marcelo F. [UNESP]-
Autor(es): dc.creatorMartins, Leandro [UNESP]-
Autor(es): dc.creatorNery, José G. [UNESP]-
Data de aceite: dc.date.accessioned2022-02-22T00:28:22Z-
Data de disponibilização: dc.date.available2022-02-22T00:28:22Z-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2020-01-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.inoche.2019.107710-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/199806-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/199806-
Descrição: dc.descriptionChromium silicates with MFI topology were hydrothermally synthesized, characterized, and applied as heterogeneous catalysts on the one-step gas-phase glycerol conversion into acetaldehyde and acrolein. The catalysts were characterized by XRD, SEM, FT-IR, ICP-OES, XPS, pyridine adsorption, nitrogen adsorption/desorption, and TGA. The experimental results showed that the use of chromium led to a zeolite containing surface-active species and framework chromium atoms, which were identified by XPS analysis, and named as Cr(1), Cr(2) and Cr(3) species. The catalytic reactions with CrMFI-H exhibited high glycerol conversion (97%), and the main products were acetaldehyde (30%) and acrolein (10%). The high yield of acetaldehyde was due to oxidation reactions taking place in Cr(3) species. A reaction pathway for the formation of acetaldehyde was proposed, and the DFT calculations corroborated the proposed mechanism. In comparison with MFI-H catalysts, reactions with CrMFI-H led to the formation or deposition of a negligible amount of coke (less than 3 wt%) either under O2 or N2 atmosphere. This study highlights the advantage of combining acid and redox sites in a single catalyst because the redox sites not only assist the selective conversion of glycerol but also participate in the oxidation of monomeric coke species before they polymerize and block the pores of the catalysts.-
Descrição: dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionSão Paulo State University – UNESP Physics Department, Campus-São José do Rio Preto-
Descrição: dc.descriptionSão Paulo State University – UNESP Institute of Chemistry Biochemistry and Technology Department, Campus-Araraquara-
Descrição: dc.descriptionSão Paulo State University – UNESP Department of Chemistry and Environmental Sciences, Campus-São José do Rio Preto-
Descrição: dc.descriptionSão Paulo State University – UNESP Physics Department, Campus-São José do Rio Preto-
Descrição: dc.descriptionSão Paulo State University – UNESP Institute of Chemistry Biochemistry and Technology Department, Campus-Araraquara-
Descrição: dc.descriptionSão Paulo State University – UNESP Department of Chemistry and Environmental Sciences, Campus-São José do Rio Preto-
Descrição: dc.descriptionCNPq: 401679/2013-6-
Descrição: dc.descriptionCNPq: 473346/2012-5-
Idioma: dc.languageen-
Relação: dc.relationInorganic Chemistry Communications-
???dc.source???: dc.sourceScopus-
Título: dc.titleSynthesis and characterization of chromium silicate catalyst and its application in the gas phase glycerol transformation into acetaldehyde-
Tipo de arquivo: dc.typelivro digital-
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