科研之友
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摘要
A new type of composite sorbent-SCR system has been designed for NOx elimination of diesel vehicles to promote the NOx conversion rate at low temperatures (50-250 degrees C), with the sorption reaction temperature of 50-100 degrees C for safety reason. NH3 is sorbed by composite sorbents with expanded natural graphite treated with sulfuric acid (ENG-TSA) matrix at room temperature, and released from composite sorbents by heating phase, which is driven by both electricity and exhaust waste heat. The composite sorbent is a porous composite of 80% chemical sorbents and 20% ENG-TSA. The NH3 sorption capacity of chemical sorbents (NH4Cl, NaBr, BaCl2, CaCl2 and SrCl2) have been evaluated and compared with traditional urea-SCR system with AdBlue, and the results are analyzed. NH3 cannot be pyrolyzed from AdBlue below 160 degrees C, and the NOx conversion rate of the composite sorbent-SCR system is about 45% higher than the urea SCR system (0%) at 50 degrees C. NH4Cl and NaBr are not suitable for composite sorbent-SCR system for that the pressure is too high even at the environmental temperature. According to the NH3 sorption capacity, composite of CaCl2 with ENG-TSA and composite of SrCl2 with ENG-TSA are both optimal solid sorbents, and between them CaCl2 with ENG-TSA as matrix is the best choice for the small mass required and the low cost.
- 出版日期2018-1-5
- 单位上海交通大学
