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Research on NH3-SCR performance and ammonia storage characteristics based on different Cu-CHA catalyst schemes
Received date: 2024-02-20
Online published: 2024-04-08
To investigate the effects of coating silicon aluminum ratio（SAR），loading amount，cell density of substrate scheme，and ammonia/nitrogen oxide molar ratio（ANR） on transient NO x conversion efficiency and ammonia storage characteristics of SCR catalysts，Cu-CHA coatings with SAR=12 and 22 were prepared by ion exchange method.Four coating catalyst schemes were prepared by combining loading amounts of 140 g/L and 160 g/L，62 pores/cm2 and 93 pores/cm2 mesh size carriers.Through NH3-TPD/H2-TPR characterization of the material，it was found that the SAR=12 coating had more active Cu2+ and more acidic sites.The transient single point performance and operating condition emissions of SCR were studied using a fixed bed reactor and an engine bench，respectively.Single point performance studies showed that the low-temperature NO x reaction rates of each scheme were 12-160-93，12-160-62，12-140-62，22-160-62.Under the 12-160-93 scheme，the average single point reaction rates at 180 ℃，200 ℃，and 250 ℃ could reach 2.24 ×10-6 mol/s，4.37×10-6 mol/s and 1.48×10-5 mol/s，respectively.Low SAR，high load，and high cell density schemes could improve the transient NO x conversion rate at a single point，reduce the transient ammonia storage capacity.Improving ANR could simultaneously enhance transient NO x conversion rate and transient ammonia storage capacity.The NO x emissions under different operating conditions were consistent with the low-temperature single point performance，but the high load scheme enhanced the NH3 leakage under changing operating conditions，which was opposite to the trend of NH3 leakage at a single point performance.
LAI Huilong , YU fei , YANG Dongxia , MA Jiangli , YIN Xuemei , CHANG Shiying . Research on NH3-SCR performance and ammonia storage characteristics based on different Cu-CHA catalyst schemes[J]. Inorganic Chemicals Industry, 2024 , 56(12) : 159 -166 . DOI: 10.19964/j.issn.1006-4990.2024-0089
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