Pristine CeO₂ is not active for the selective catalytic reduction of NO_x 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 Brønsted acid sites due to the sulfation are responsible for the enhanced alkali resistance of sulfated CeO₂ catalyst.

中文翻译：

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增强硫酸化CeO ₂催化剂的耐碱性，以减少生物质燃烧烟气中的NO _x

原始的CeO ₂不是用于选择性催化还原的活性NO _X与NH ₃（NH ₃ -SCR）和SCR活性几乎完全丧失由于引入K的但是，铈的硫酸化治疗_2所导致显著改善SCR活性和对钾中毒的明显抵抗力 原位DRIFTS结果表明，添加K很少影响NH ₃在硫酸化CeO _2上的吸附，而在掺杂K的CeO ₂的情况下，NH ₃的吸附变得非常弱。。由于硫酸化作用，布朗斯台德酸位明显改善，这是硫酸化CeO ₂催化剂耐碱性增强的原因。