SO2-Induced Alkali Resistance of FeVO4/TiO2 Catalysts for NO_x Reduction

Zhiping Si; Yongjie Shen; Jiebing He

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SO2-Induced Alkali Resistance of FeVO4/TiO2 Catalysts for NO_x Reduction

机译：SO2-Induced Alkali Resistance of FeVO4/TiO2 Catalysts for NO_x Reduction

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Selective catalytic reduction of nitrogen oxides with ammonia (NH3-SCR) is an efficient NO_x abatement strategy, but deNO_x catalysts suffer from serious deactivation due to the coexistence of multiple poisoning substances such as K, SO2, etc. in the flue gas. It is essential to understand the interaction among various poisons and their effects on NO_x abatement. Here, we unexpectedly identified the K migration behavior induced by SO2 over K-poisoned FeVO4/TiO2 catalysts, which led to alkali-poisoning buffering and activity recovery. It has been demonstrated that the K would occupy both redox and acidic sites, which severely reduced the reactivity of FeVO4/ TiO2 catalysts. After the sulfuration of the K-poisoned catalyst, SO2 preferred to be combined with the surface K2O, lengthened the K-O_(Fe) and K-O_v, and thus released the active sites poisoned by K2O, thereby preserving an increase in the activity. As a result, for the K-poisoned catalyst, the conversion of NO_x increased from 21 to 97% at 270 °C after the sulfuration process. This work contributes to the understanding of the specific interaction between alkali metals and SO2 on deNO_x catalysts and provides a novel strategy for the adaptive use of one poisoning substance to counter another for practical NO_x reduction.

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《Environmental Science & Technology: ES&T》 |2022年第1期|605-613|共9页
作者
Zhiping Si; Yongjie Shen; Jiebing He;
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作者单位

International Joint Laboratory of Catalytic Chemistry, State Key Laboratory of Advanced Special Steel, Department of Chemistry, Research Center of Nano Science and Technology, College of Sciences, Shanghai University, Shanghai 200444, China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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正文语种英语
中图分类环境科学、安全科学;
关键词
NO_x abatement; selective catalytic reduction; alkali resistance; Fe-based catalysts; multiple poisons;

SO2-Induced Alkali Resistance of FeVO4/TiO2 Catalysts for NO_x Reduction

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