PRODUCING AMMONIUM CARBAMATE AND REDUCING NITROGEN OXIDES
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United States of America
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Jan 23, 2020
app pub date -
Dec 1, 2017
filing date -
Dec 1, 2017
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Abstract
A process for reducing nitrogen oxides in an exhaust stream, such as a vehicle exhaust stream, and apparatus for carrying out the process. The process comprises providing a first composition comprising aqueous urea, a second composition comprising ammonium carbamate and an exhaust stream comprising nitrogen oxides. A process for producing the ammonium carbamate is also provided. The second composition may be introduced into the exhaust stream (10) when the exhaust stream has a temperature below a threshold temperature and the first composition may be introduced into the exhaust stream when the exhaust stream has a temperature at or above the threshold temperature.
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