Abstract
Abstract A number of nano-gold catalysts were prepared by depositing gold on different metal oxides (viz. Fe 2 O 3 , Al 2 O 3 , Co 3 O 4 , MnO 2 , CeO 2 , MgO, Ga 2 O 3 and TiO 2 ), using the homogeneous deposition precipitation (HDP) technique. The catalysts were evaluated for their performance in the combustion of methane (1 mol% in air) at different temperatures (300–600 °C) for a GHSV of 51,000 h −1 . The supported nano-gold catalysts have been characterized for their gold loading (by ICP) and gold particle size (by TEM/HRTEM or XRD peak broadening). Among these nano-gold catalysts, the Au/Fe 2 O 3 (Au loading = 6.1% and Au particle size = 8.5 nm) showed excellent performance. For this catalyst, temperature required for half the methane combustion was 387 °C, which is lower than that required for Pd(1%)/Al 2 O 3 (400 °C) and Pt(1%)/Al 2 O 3 (500 °C) under identical conditions. A detailed investigation on the influence of space velocity (GHSV = 10,000–100,000 cm 3 g −1 h −1 ) at different temperatures (200–600 °C) on the oxidative destruction of methane over the Au/Fe 2 O 3 catalyst has also been carried out. The Au/Fe 2 O 3 catalyst prepared by the HDP method showed much higher methane combustion activity than that prepared by the conventional deposition precipitation (DP) method. The XPS analysis showed the presence of Au in the different oxidation states (Au 0 , Au 1+ and Au 3+ ) in the catalyst.
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