Nanostructured CeO₂&ndash;Al₂O₃ Catalytic Powders for <i>m</i>-Xylene and Toluene Combustion

Abstract

The bee's nest-like nanostructured CeO 2 Al 2 O 3 powders were synthesized by combustion method using polyvinyl alcohol as a fuel and their catalytic activity were tested in the m-xylene and toluene combustion. The results showed that the catalytic reaction temperature increased monotonically from 200 to 250°C and from 250 to 300°C for the 90% conversion of m-xylene and toluene, respectively, with the calcination temperature in the range of 450850°C. For both combustions, the sample calcined at 450°C with a bee's nest-like nanostructure and average pore size of 800 nm exhibited the highest catalytic activity. Among the samples calcined at 850°C, the lowest catalytic reaction temperature for the 90% conversion of m-xylene and toluene of 250 and 300°C, respectively, was found with the sample having the equimolar ratio of Ce/Al.

Fabrication of Cobalt-Doped Ceria Nanorods for <i>p</i>-Xylene Deep Oxidation: Effects of Cobalt Precursor and Loading

“…Therefore, the current efforts have devoted d-transition metal oxide catalysts for VOCs removal instead of the traditional ones. Recently, numerous catalytic systems for VOCs oxidation have been reported such as oxidation of 2-propanol over M-Pt/£-Al 2 O 3 (M = Cr, Mn and Fe); 3) toluene over Pt/CeO 2 , 4) nanostructured CeO 2 Al 2 O 3 , 5) semiconductive ¡-Fe 2 O 3 6) and catalyst system based upon heater-integrated catalyst units using NiO or Cr 2 O 3 ; 7) C 9 to C 10 paraffins and napthtenics on CuO/Al 2 O 3 ; 8) mxylene on CeO 2 Al 2 O 3 ; 5) p-xylene on CuOCeO 2 /ZRM; 9) etc. Frequently, metal oxides based on Cu, Cr, Mn, Fe, Co, and Ni demonstrate high catalytic activity in the deep oxidation.…”