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Supported copper and cobalt oxides on activated carbon for simultaneous oxidation of toluene and cyclohexane in air

Zabihi, M ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1039/c4ra14430a
  3. Publisher: Royal Society of Chemistry , 2015
  4. Abstract:
  5. Copper and cobalt oxides supported on almond shell derived activated carbon (AC) with different loadings were synthesized by sequential and co-deposition-precipitation methods leading to Cu(shell)/Co(core)/AC, Co(shell)/Cu(core)/AC and Cu-Co(mixed)/AC catalysts that were subsequently used for catalytic oxidation of gaseous mixtures of toluene and cyclohexane in air in a tubular flow reactor. The catalysts and the support were characterized by Boehm test, Brunauer-Emmett-Teller (BET) surface area, X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), inductively coupled plasma (ICP), and thermogravimetric analysis (TGA). Catalyst efficiency for toluene and cyclohexane oxidation, both separately and in a mixture, was higher over the mixed metal oxides catalysts compared with the core-shell catalysts. An increase in the cobalt loading on the support led to a decrease in the metal oxide crystallite size and a change in the catalyst morphology. The best performance was obtained for the Cu2-Co6(mixed)/AC sample (Removal Efficiency >99.9%). Agglomeration of copper oxide over cobalt oxide crystallites for Cu(shell)/Co(core)/AC samples resulted in catalysts with the worst performance for complete oxidation of VOCs. Results indicated a negligible deterrence effect of toluene on cyclohexane oxidation. Furthermore, the addition of water (humid air) decreased the conversion of hydrocarbons
  6. Keywords:
  7. Activated carbon ; Catalytic oxidation ; Cobalt ; Copper ; Copper oxides ; Crystallite size ; Cyclohexane ; Energy dispersive spectroscopy ; Field emission microscopes ; Mixtures ; Oxidation ; Plasma applications ; Precipitation (chemical) ; Scanning electron microscopy ; Shells (structures) ; Thermogravimetric analysis ; Toluene ; Transmission electron microscopy ; X ray diffraction ; X ray photoelectron spectroscopy ; Brunauer-emmett-teller surface areas ; Cyclohexane oxidation ; Energy dispersive x-ray spectroscopy ; Field emission scanning electron microscopy ; Inductively coupled plasma (ICP) ; Oxidation of toluenes ; Removal efficiencies ; Tubular flow reactors ; Catalyst supports
  8. Source: RSC Advances ; Volume 5, Issue 7 , Dec , 2015 , Pages 5107-5122 ; 20462069 (ISSN)
  9. URL: http://pubs.rsc.org/en/Content/ArticleLanding/2015/RA/C4RA14430A#!divAbstract