Versatile heterogeneous dipicolinate complexes grafted into kaolinite: Catalytic oxidation of hydrocarbons and degradation of dyes

Autor(es):Mostrar menos -

Araujo, Francielle R. ^[1] ; Baptista, Joel G. ^[1] ; Marcal, Liziane ^[1] ; Ciuffi, Katia J. ^[1] ; Nassar, Eduardo J. ^[1] ; Calefi, Paulo S. ^[1] ; Vicente, Miguel A. ^[2] ; Trujillano, Raquel ^[2] ; Rives, Vicente ^[2] ; Gil, Antonio ^[3] ; Korili, Sophia ^[3] ; de Faria, Emerson H. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Franca, Sol Gel Grp, BR-14404600 Franca, SP - Brazil

^[2] Univ Salamanca, Dept Quim Inorgan, GIR QUESCAT, E-37008 Salamanca - Spain

^[3] Univ Publ Navarra, Dept Quim Aplicada, Pamplona 31006 - Spain

• Tipo de documento: Artigo Científico
• Fonte: CATALYSIS TODAY; v. 227, p. 105-115, MAY 15 2014.
• Citações Web of Science: 20

Resumo

New heterogeneous catalysts were prepared by immobilization of Me(II)-dipicolinate complexes (Me = Co, Mn or Ni) on kaolinite (Ka). The precursor material was kaolinite grafted with dipicolinic acid (dpa) obtained via melting of the acid. The catalysts were prepared by suspending the Ka-dpa precursors (lamellar or exfoliated) in Me2' solutions with a cation/ligand ratio of 1:3. The grafted complexes were characterized by thermal analyses, X-ray diffraction, UV/Vis and infrared spectroscopies, and transmission electron microscopy. The catalysts were tested in three reactions: (i) epoxidation of cis-cyclooctene to cis-cyclooctenoxide reaching 55% yield, with total selectivity to cyclooctenoxide; (ii) oxidation of cyclohexane, reaching 22% yield, with total selectivity towards cyclohexanone; and (iii) Fenton-like decolorization of the dyes metanil yellow, methylene blue and green light, reaching 70-100% decolorization, the maximum effectiveness being observed for methylene blue degradation. The high conversion in the oxidation reactions and the high levels of decolorization of dyes confirmed the versatility of these heterogeneous catalysts based on kaolinite. (C) 2013 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 13/50216-0 - New clay-based materials with advanced technological and environmental applications
• Beneficiário: Katia Jorge Ciuffi Pires
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/07410-7 - 15th International Congress on Catalysis 2012
• Beneficiário: Emerson Henrique de Faria
• Modalidade de apoio: Auxílio à Pesquisa - Reunião - Exterior
• Processo FAPESP: 11/17660-8 - Estudos das Propriedades Catalíticas de Dipicolinato de Co2+, Mn2+ e Ni2+ Imobilizados em Caulinita.
• Beneficiário: Francielle Rodrigues Araújo
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica