Reduction of Nitric Oxide by Ammonia over Precipitated Alumina Base Catalysts (III):Physical Properties and Catalytic Activities of Precipitated Vanadium Oxide-Alumina Catalysts

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The physical properties and catalytic activities of vanadium oxide-alumina catalysis prepared by precipitation methods were studied. A highly active catalyst was obtained by mixing alumina hydrogel, prepared by hydrolyzing sodium aluminate with nitric acid, with a chloride free vanadium compound (such as ammonium meta vanadate, vanadil oxalate and sodium vanadate) in wet state. Calcination at temperatures above 700°C was found essetial to the high activity. Percents NO removal at standard reaction condition (SV 20, 000hr-1, NO 300ppm, NH3 450ppm, SO2 100PPm, O2 5%, H2O 10%, N2 balance) were as follows: 70.0% (200°C), 99.2% (250°C), 99.2% (300°C), 99.8% (350°C). The way of preparing the alumina hydrogel had a marked effect on its pore structure but little effect on the catalytic activity.
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