| abstract |
Catalysts for the oxidation of sulfur dioxide to sulfur trioxide, consisting of a carrier based on silicic acid and vanadium and alkali metal compounds containing active substance applied thereon, are produced by dissolving vanadium pentoxide in alkali eyes, acidifying the solution with sulfuric acid and acidifying the solution with a carrier mixed, the mixture deformed, dried and calcined.n n n Zeck's achievement of mechanically stable catalysts is done by adding a dissolved alkali silicate and / or silica sol to the alkaline solution before acidification, performing the acidification at temperatures <35 ° C and then immediately working the solution into the support. The moist crumbly mass obtained has a V 2 O 5 content of 2-6% by weight, an H Z O content of 35 to 45% by weight and an SiO 2 content of 15 to 50% by weight. 5 to 25% of the total silica content comes from the dissolved alkali silicate and / or silica sol. |