Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 125, Issue 27, Pages 14675-14680Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.1c04055
Keywords
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Funding
- National Natural Science Foundation of China [11564010]
- China Postdoctoral Science Foundation [2021M693813]
- Natural Science Foundation of Guangxi [2020GXNSFBA297029]
- Foundation of Guilin University of Technology [GLUTQDJJ2020003]
- Open Foundation of Guangxi Key Laboratory of Optical and Electronic Materials and Devices [20AA-7, 20AA-13]
- Innovationdriven Major Project of Guangxi [AA18118010]
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Increasing Cu concentration in Cu-SSZ-13 catalysts can enhance SCR activity, but excessive Cu concentration leads to decreased catalytic efficiency.
The influence of Cu concentration on the selective catalytic reduction (SCR) of NO with ammonia (NH3-SCR) for copper-exchanged aluminosilicate zeolite catalysts (Cu-SSZ-13) was investigated. The results demonstrate that the SCR performance of the catalysts increases initially and decreases subsequently with an increase in Cu concentration in the low-temperature region (100-300 degrees C). The highest low-temperature SCR activity (lightoff temperature is 149 degrees C) is obtained in the Cu-0.100-SSZ-13 catalyst, i.e., the concentration of the Cu salt solution reaches up to 0.100 mol/L. BET and XRD results illustrate that the concentration of the Cu salt solution does not have a significant effect on the structure of the samples. The NH3-TPD and H-2-TPR outcomes demonstrate that the amount of Lewis acidity and isolated Cu2+ on Cu-SSZ-13 catalysts increases as the CuCl2 concentration increases from 0 to 0.125 mol/L. However, most of the H+ in the Bronsted acid sites (Si-OH-Al) are replaced by isolated Cu2+, which limits the storage and transfer capacity of ammonia. As a result, the catalytic efficiency of Cu-SSZ-13 reduces with a further increase in CuCl2 concentration.
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