Nitration with nitrogen dioxide in the presence of activated silica

NITRATION WITH NITROGEN DIOXIDE IN THE PRESENCE OF ACTIVATED SILICA 

McKee Mid Wilhelm [92] found that the highest yield of nitration of benzene with nitrogen dioxide in the vapour phase was obtained at 310°C. In the presence of activated silica the yield was higher than that obtained without a catalyst Mid could Mnount to 83.6%. Nitrophenol was also formed in a yield rising with temperature, so that at 330°C it was the principal reaction product. The authors supposed that the catalytic action of activated silica was probably a specific one Mid did not consist only in binding the water formed during the nitration process. 

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