吉林大学学报(工学版) ›› 2015, Vol. 45 ›› Issue (6): 1804-1810.doi: 10.13229/j.cnki.jdxbgxb201506011

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Decomposition characteristics of solid reductant of vehicle SCR system

MA Jun-yan, QU Da-wei, LI Jun   

  1. State Key Laboratory of Automotive Simulation and Control,Jilin University,Changchun 130022,China
  • Received:2013-11-14 Online:2015-11-01 Published:2015-11-01

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Abstract: The ammonia content, decomposition temperature and decomposition rate of ammonium bicarbonate, ammonium carbonate and ammonium carbamate are investigated by theoretical analysis, Thermogravimetric Analysis (TGA) experiment and equilibrium pressure experiments. Results show that ammonium carbamate has the highest ammonia content, followed by ammonium carbonate, and ammonium bicarbonate has the lowest ammonia content. Ammonium carbonate and ammonium carbamate can decompose from room temperature, but when heated to 100 ℃ ammonium bicarbonate only decomposes 5.6%. When the temperature is below 90 ℃, the decomposition rate of ammonium carbamate is higher than that of ammonium carbonate. Under the same period and same temperature, ammonium carbamate produces more ammonia. The decomposition equilibrium pressures of ammonium carbonate and ammonium carbamate are similar; both are excellent candidates of reductant of Selective Catalytic Reduction (SCR) system, but ammonium carbamate has more obvious advantages.

Key words: power machinery and engineering, decomposition characteristics, ammonium salt, selective catalytic reduction

CLC Number: 

  • TK421.5
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