Catalytic activity of porphyrin-catalyts immobilized on kaolinite

Author(s)

Cintra, Thais E. ^[1] ; Saltarelli, Michelle ^[1] ; Salmazo, Rosangela M. de F. ^[1] ; da Silva, Tiago Honorato ^[1] ; Nassar, Eduardo J. ^[1] ; Trujillano, Raquel ^[2] ; Rives, Vicente ^[2] ; Vicente, Miguel A. ^[2] ; de Faria, Emerson H. ^[1] ; Ciuffi, Katia J. ^[1]

Affiliation

^[1] Univ Franca, Ave Dr Armando Salles Oliveira, 201 Pq Univ, BR-14404600 Franca, SP - Brazil

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

• Document type: Journal article
• Source: APPLIED CLAY SCIENCE; v. 168, p. 469-477, FEB 2019.
• Web of Science Citations: 3

Abstract

Two new biomimetic iron-porphyrin heterogeneous catalysts prepared by grafting of iron(III)-5,10,15,20-tetrakis(4-hydroxyphenyl)porphyrin (FeTHPP) on 3-chloropropyltrimethoxysilane (ClPTMS) functionalized kaolinite and on a silica prepared through hydrolysis and condensation of tetraethylorthosilicate (TEOS) and ClPTMS, are reported. The catalysts were characterized and tested for the epoxidation of (Z)-cyclooctene and oxidation of cyclohexane using iodosylbenzene as oxygen donor. The position of the Soret band confirmed that the structure of FeTHPP was preserved in the final solids. All catalysts showed a high conversion of the substrates, with total selectivity to the epoxide in the oxidation of cyclooctene, and high selectivity to the ketone in the oxidation of cyclohexane. The catalysts were also used for degradation of dyes in aqueous solutions. The ferroporphyrin-silica catalyst showed the best behavior for (Z)-cyclooctene (48% epoxide) and cyclohexane (48% conversion, sum of alcohol and ketone as products) and also for the degradation of the dyes (97% for methylene blue, although with simultaneous adsorption, close to 85% for Orange II and Brilliant Green), while the ferroporphyrin-kaolinite system showed the best behavior for cyclohexane oxidation (48%, with total selectivity to the ketone). (AU)

• FAPESP's process: 16/01501-1 - Multifunctional catalysts for advanced oxidation processes employing biogenic matrices or clays
• Grantee: Katia Jorge Ciuffi Pires
• Support type: Regular Research Grants
• FAPESP's process: 16/50322-2 - Materials with advanced technological and environmental applications
• Grantee: Katia Jorge Ciuffi Pires
• Support type: Regular Research Grants
• FAPESP's process: 17/15482-1 - Novel strategies synthesis to reuse Tanner industry by-products to obtain high-value functional porous materials
• Grantee: Emerson Henrique de Faria
• Support type: Regular Research Grants