Abstract
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°C), with the sorption reaction temperature of 50–100°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°C, and the NOx conversion rate of the composite sorbent-SCR system is about 45% higher than the urea-SCR system (0%) at 50°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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
