In situ regeneration of sulfated Cu/SAPO-34 catalyst for the selective catalytic reduction of NOx with NH3
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The regeneration mechanism of sulfated Cu/SAPO-34 catalysts in reducing atmospheres (5% H2/Ar and NH3/Ar at 600 °C) was investigated by using a series of characterization methods. Hydrogen regeneration improved the catalysts’ NH3-SCR activity from 150 to 550 °C remarkably, while ammonia regeneration exhibited relatively less obvious promotion effect. The TPR of hydrogen and EPR spectra data show that the regeneration process affects the amount and the coordination of the active isolated Cu2+ species significantly. The desulfation increases the amount of isolated copper ions and improves the catalytic activity of SCR.
KeywordsSulfated Cu/SAPO-34 deNOx Reducing atmosphere Regeneration Isolated Cu2+
The authors acknowledge the funding support of the National Natural Science Foundation of China (No. 51702215), the Science and Technology Department of Zhejiang Province (LGG19B070002), the Science and Technology Program of Shaoxing (2017B70051), Shaoxing University (No. 2016LG1001), National Training Programs of Innovation and Entrepreneurship for Undergraduates (201810349011) and Xinmiao Talent Program of Zhejiang Province (2018R432003).
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