why nitrogen tetroxide does not used in the nitration of benzene ?
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Vapor phase nitration of benzene over acidic catalysts is expected to be a clean process with no sulfuric acid waste. We investigated this process over acidic catalysts utilizing nitrogen dioxide (NO2) as a nitrating agent, and found that several mixed metal oxides, such as silica-alumina, zinc oxide-titania, and tungsten oxide-molybdenum oxide, exhibited a fairly good activity. Among them, WO3−MoO3 is the most active; however, only this catalyst deviated from the linear relationship between the activity and the acidity. In order to explain this discrepancy, several factors such as acid amount, acid strength, and BET surface area, are examined in detail.
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