Synthesis of Reduced Graphene Oxide-Carbon Nanotubes (rGO-CNT) Composite and Its Use As a Novel Catalyst Support for Hydro-Purification of Crude Terephthalic Acid

Tourani, S ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1021/acs.iecr.5b01574
  3. Publisher: American Chemical Society , 2015
  4. Abstract:
  5. Palladium nanocatalysts supported on reduced graphene oxide (rGO), multi walled carbon nanotubes (MWCNT), and rGO/CNT composite were synthesized by a wet impregnation method using PdCl2 as a precursor. Palladium loading was 0.3 wt %, and the catalysts were reduced at 300°C. The catalysts were characterized by inductively coupled plasma, Brunauer-Emmett-Teller (BET) analysis, Fourier transform infrared spectroscopy, X-ray powder diffraction, transmission electron microscopy, temperatue-programmed reduction, temperatue-programmed desorption, and Raman spectroscopy. The performance of the catalysts was investigated for hydro-purification of crude terephthalic acid (CTA) containing 2100 ppm 4-carboxybenzaldehyde (4-CBA) as an impurity. The reaction products were analyzed by HPLC to determine the amounts of 4-CBA, benzoic acid, and p-toluic acid. Pd/rGO-CNT catalyst had excellent performance in terms of both selectivity and 4-CBA conversion. All catalysts exhibited more than 99% removal of 4-CBA. The most desired selectivity, however, was obtained for the catalyst with rGO-CNT as a support. Comparison with the performance of the commercial catalyst (0.5 wt % palladium on activated carbon) indicated that the Pd/rGO-CNT catalyst had a better performance
  6. Keywords:
  7. Activated carbon ; Benzoic acid ; Catalyst selectivity ; Catalysts ; Fourier transform infrared spectroscopy ; Graphene ; High resolution transmission electron microscopy ; Inductively coupled plasma ; Multiwalled carbon nanotubes (MWCN) ; Purification ; Transmission electron microscopy ; X ray powder diffraction ; Yarn ; 4-carboxybenzaldehyde (4-CBA) ; Better performance ; Brunauer emmett tellers ; Commercial catalyst ; Reduced graphene oxides ; Reduced graphene oxides (RGO) ; Terephthalic acids ; Wet impregnation method ; Catalyst supports
  8. Source: Industrial and Engineering Chemistry Research ; Volume 54, Issue 31 , 2015 , Pages 7591-7603 ; 08885885 (ISSN)
  9. URL: http://pubs.acs.org/doi/abs/10.1021/acs.iecr.5b01574