Abstract:

Chlorobenzene nitration was carried out using supported heteropoly acids as catalysts and N2O5 as nitrating agent. Many factors were investigated, such as kinds of heteropoly acids and carriers, loading of heteropoly acid, number of use, and so on. Results shows the nitration using N2O5 is an acid catalyzed reaction, the supported heteropoly acids can highly enhance the nitration ability of N2O5; the catalyst can be directly reused after recycle, and its activity is not obviously decreased. In the optimum condition, the yield of nitration is 26%, and para-selectivity is up to 68.8%, which indicates that is N2O5 a prospective nitration agent, it can replace the concentrated mineral acid as the catalyst which is one of the most environmentally harmful processes, and meets the requirement of green environmental protection.

Key words: Heteropoly acids, Dinitrogen pentoxide, Chlorobenzene, Nitration