Enhanced alkali resistance of sulfated CeO2 catalyst for the reduction of NOx from biomass fired flue gas
Enhanced alkali resistance of sulfated CeO2 catalyst for the reduction of NOx from biomass fired flue gas
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DOI：
10.1016/j.catcom.2020.106230
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发表时间：
2021-01
影响因子：
3.7
通讯作者：
Zizheng Zhou;Jianmin Lan;Lin-Dong Liu;Zhiming Liu
中科院分区：
文献类型：
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作者：
Zizheng Zhou;Jianmin Lan;Lin-Dong Liu;Zhiming Liu
原始CeO 2对NH3选择性催化还原NOx（NH3-SCR）反应没有活性，K的引入使催化剂的SCR活性几乎完全丧失。然而，硫酸化处理的CeO 2导致显着提高SCR活性和显着抵抗K中毒。原位DRIFTS结果表明，K的加入对硫酸化CeO 2上NH3的吸附几乎没有影响，而K掺杂CeO 2上NH3的吸附变得很弱.硫酸化后催化剂的Brønsted酸中心显著增加，从而提高了催化剂的耐碱性。
Pristine CeO2is not active for the selective catalytic reduction of NOxwith NH3(NH3-SCR) and the SCR activity is nearly totally lost due to the introduction of K. However, sulfation treatment of CeO2leads 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 NH3over sulfated CeO2, whereas the adsorption of NH3becomes very weak in the case of K-doped CeO2. The noticeably improved Brønsted acid sites due to the sulfation are responsible for the enhanced alkali resistance of sulfated CeO2catalyst.