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We show for the first time that the NH +4 exchanged form of ZSM-5 zeolite is as effective as the H + form of the catalyst for the regioselective conversion of toluene to mononitrotoluene (MNT) using 90% nitric acid as the sole nitrating agent. The auto-ionization of the acid in the absence of protons on the zeolite surface is sufficient for the formation of reactive nitronium...
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