Metalloporphyrins immobilized in Fe3O4@SiO2 mesoporous submicrospheres: Reusable biomimetic catalysts for hydrocarbon oxidation

J Colloid Interface Sci. 2016 May 1:469:296-309. doi: 10.1016/j.jcis.2016.01.059. Epub 2016 Jan 27.

Abstract

We successfully immobilized metalloporphyrins (MeP) in mesoporous silica coating magnetite spheres. In this sense, we prepared two different classes of core@shell supports, which comprise aligned (Fe3O4-AM-MeP, MeP=FeP or MnP) and non-aligned (Fe3O4-NM-MeP, MeP=FeP or MnP) mesoporous magnetic structures. X-ray diffractometry and energy dispersive X-ray spectroscopy confirmed the mesoporous nature of the silica shell of the materials. Magnetization measurements, scanning and transmission electron microscopies (SEM/TEM), electrophoretic mobility (ζ-potential), and infrared spectroscopy (FTIR) also confirm the composition and structure of the materials. The catalysts maintained their catalytic activity during nine reaction cycles toward hydrocarbon oxidation processes without detectable catalyst leaching. The catalysis results revealed a biomimetic pattern of cytochrome P450-type enzymes, thus confirming that the prepared materials are can effectively mimic the activity of such groups.

Keywords: Biomimetic catalysis; Core@shell structures; Magnetite particles; Mesoporous structures; Porphyrins.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biomimetic Materials / chemistry*
  • Catalysis
  • Ferrosoferric Oxide / chemistry*
  • Hydrocarbons / chemistry*
  • Metalloporphyrins / chemistry*
  • Microspheres*
  • Molecular Structure
  • Oxidation-Reduction
  • Particle Size
  • Porosity
  • Silicon Dioxide / chemistry*
  • Surface Properties

Substances

  • Hydrocarbons
  • Metalloporphyrins
  • Silicon Dioxide
  • Ferrosoferric Oxide