Journal
CATALYSIS COMMUNICATIONS
Volume 149, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.catcom.2020.106230
Keywords
NH3-SCR; Sulfated CeO2; Alkali resistance; Nitrogen oxides
Categories
Funding
- National Key R&D Program of China [2017YFC0210700]
- National Natural Science Foundation of China [21876009, 21677008]
- Beijing Municipal Natural Science Foundation [8162030]
- Fundamental Research Funds for the Central Universities [XK1802-1]
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Sulfation treatment of CeO2 improves the SCR activity and resistance against K poisoning, attributed to the increased Bronsted acid sites of sulfated CeO2. The addition of K has little effect on NH3 adsorption over sulfated CeO2, but greatly weakens NH3 adsorption on K-doped CeO2.
Pristine CeO2 is not active for the selective catalytic reduction of NOx with NH3 (NH3-SCR) and the SCR activity is nearly totally lost due to the introduction of K. However, sulfation treatment of CeO2 leads to significantly improved SCR activity and remarkable resistance towards K poisoning. In-situ DRIFTS results revealed that the addition of K seldom affects the adsorption of NH3 over sulfated CeO2, whereas the adsorption of NH3 becomes very weak in the case of K-doped CeO2. The noticeably improved Bronsted acid sites due to the sulfation are responsible for the enhanced alkali resistance of sulfated CeO2 catalyst.
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