Reduction of Nitric Oxide by Ammonia over Silica Supported Vanadium Oxide Catalysts (III):Effects of Additives

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A series of catalysts f or reduction of nitric oxide by ammonia were prepared by supporting vanadium oxide on silica and modified by several metal oxides. A highly active catalyst was consisted of vanadium oxide-titanium oxide-silica prepared by the f ollowing procedure, Titanic sulfate sol.↓ Silica gel (Davison ID) → Impregnation → Evaporation Ammonia water ↓ → Neutralization→Washing→Drying (120°C, 24 hr) Vanadyl oxalate sol.↓ →Impregnation→Drying (120°C, 24 hr) →Calcination (350°C, 3 hr, in air) In the neutralization, titanic sulfate changed to titanium hydroxide in the pore of silica. Under a set of reaction conditions, percent NO removal over this catalyst increased by the rise in reaction temperature, 80.0% (180°C), 94.7% (200°C), 100% (250°C), 100% (300°C), 100% (350°C), Although the content of V2O5 was as low as 5% by weight, the activity of the catalyst was markedly high in comparison with that of vanadium oxide-silica catalyst. Calcination temperature of the catalyst had little effect on the activity. It was suggested that titanium oxide precoated on silica reduced substantially the adverse effect of the silica surface.
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