Contact of adsorbed ammonium nitrite, NH4NO2, with HCl vapor or a solid acid such as the zeolite HY, significantly lowers the temperature of its decomposition to N2 + H2O. Protonated NH4NO2 decomposes at room temperature. The decomposition of ammonium nitrite is one of the steps in the catalytic reduction of NO x with ammonia or other reductants.
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Li, M., Yeom, Y., Weitz, E. et al. An acid catalyzed step in the catalytic reduction of NO x to N2 . Catal Lett 112, 129–132 (2006). https://doi.org/10.1007/s10562-006-0191-y
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DOI: https://doi.org/10.1007/s10562-006-0191-y