Journal
KOREAN JOURNAL OF CHEMICAL ENGINEERING
Volume 36, Issue 8, Pages 1249-1257Publisher
KOREAN INSTITUTE CHEMICAL ENGINEERS
DOI: 10.1007/s11814-019-0307-x
Keywords
Cu/SSZ-13; NH3-SCR; Sulfur Poisoning; Regeneration; Cu Species
Funding
- National Key Research and Development program [2017YFC 0211302]
- National Natural Science Foundation of China [21676195]
- Science Fund of State Key Laboratory of Engine Reliability [skler-201714]
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To understand the role of regeneration conditions on sulfur-poisoned Cu/SSZ-13 catalysts for NH3-SCR, the physicochemical characterizations and NO2 conversions were investigated. The sulfur-poisoned Cu/SSZ-13 catalysts were treated at different conditions as a function of temperature and duration. TGA results revealed that regeneration at 500 degrees C only removed parts of sulfur spices and at 700 degrees C can completely remove all sulfur spices. The physical structural characterizations results illustrate that regeneration below 700 degrees C has no significant impact on CHA structure for Cu/SSZ-13 catalysts, while dealumination occurs on poisoned Cu/SSZ-13 when regeneration temperature is higher than 700 degrees C. EPR and H-2-TPR results show that the sulfate decomposition and Cu migration reactions involved during regeneration and, as a result, the content of Cu2+ gradually increased as the extent of regeneration increased. The kinetics tests support that NOx conversion recovery is related to the content of Cu2+ increase during regeneration. Our study reveals that the optimum regeneration temperature is 700 degrees C, because severe dealumination at 750 degrees C inhibited Cu2+ amount increase.
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