反应详情

A vanadium ammonium oxalate solution was prepared by adding ammonia and oxalic acid to ammonium polyvanadate suspended in water. The solution obtained contained 9.4% by weight of vanadium, measured as metal. The carriers obtained in Examples 1-3 were impregnated with the solution and subsequently calcined at 450° C. The catalysts obtained contained 4% by weight of vanadium, calculated as the metal, and contained the titania in the anatase form. The catalysts prepared from the carriers of Examples 1-3 are indicated as catalysts 1-3, respectively. Of the catalysts, 150 mg of the sieve fraction of 0.4-0.6 mm was tested at 140° C. and a pressure of 1 bar using a gas containing 900 ppm NO, 800 ppm NH3, 5% oxygen, 11% water and the remainder being argon. The gas flow was 45 ml/min. The products were analyzed with the help of a mass spectrometer.

1. customThe solution obtained
2. customThe carriers obtained in Examples 1-3
3. customsubsequently calcined at 450° C
4. customThe catalysts obtained
5. customThe catalysts prepared from the carriers of Examples 1-3
6. customwas tested at 140° C.
7. additioncontaining 900 ppm NO