| abstract |
Nitrobenzenes are prepared by nitrating benzenes in a vapor phase with dilute or concentrated nitric acid wherein the following (A) or (B) is used as a catalyst: n (A) acidic sheet clay minerals ion-exchanged with polyvalent metals, or n (B) acidic composite oxides comprising oxides of metals belonging to Group IVA of the Mendeleefs' periodic table and tungsten oxide, molybdenum oxide, niobium oxide or zinc oxide. n These catalysts have high catalyst activity and selectivity for vapor phase nitration reaction of benzenes with nitric acid and besides the activity is retained for a long time. |