The effect of cations (NH4+, Na+, K+, and Ca2+) on chemical deactivation of commercial SCR catalyst by bromides

doi:10.1016/S1872-2067(18)63011-6

Abstract

Abstract:

Alkali and alkaline-earth metals from fly ash have a significant deactivation effect on catalysts used for selective catalytic reduction of NO_x by NH₃ (NH₃-SCR). Bromides are considered effective additives to improve Hg⁰ oxidation on SCR catalysts. In this work, the effects of different bromides (NH₄Br, NaBr, KBr, and CaBr₂) on a commercial V₂O₅-WO₃/TiO₂ catalyst were studied. NO_x conversion decreased significantly over the KBr-poisoned catalyst (denoted as L-KBr), while that over NaBr-and CaBr₂-poisoned catalysts (denoted as L-NaBr and L-CaBr, respectivity) decreased to a lesser extent compared with the fresh sample. Poor N₂ selectivity was observed over L-NaBr, L-KBr and L-CaBr catalysts. The decrease in the ratio of chemisorbed oxygen to total surface oxygen (O_α/(O_α + O_β + O_w)), reducibility and surface acidity might contribute to the poor activity and N₂ selectivity over L-KBr catalyst. The increased O_αratio was conducive to the enhanced reducibility of L-CaBr. Combined with enhanced surface acidity, this might offset the negative effect of the loss of active sites by CaBr₂ covering. The overoxidation of NH₃ and poor N₂ selectivity in NH₃ oxidation should retard the SCR activity at high temperatures over L-CaBr catalyst. The increased basicity might contribute to increased NO_x adsorption on L-KBr and L-CaBr catalysts. A correlation between the acid-basic and redox properties of bromide-poisoned catalysts and their catalytic properties is established.

Key words: Bromide, Cation, Catalyst deactivation, SCR catalyst, N₂ selectivity, Surface acidity

Huazhen Chang, Chuanning Shi, Mingguan Li, Tao Zhang, Chizhong Wang, Lilong Jiang, Xiuyun Wang. The effect of cations (NH₄⁺, Na⁺, K⁺, and Ca²⁺) on chemical deactivation of commercial SCR catalyst by bromides[J]. Chinese Journal of Catalysis, 2018, 39(4): 710-717.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(18)63011-6

https://www.cjcatal.com/EN/Y2018/V39/I4/710

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The effect of cations (NH₄⁺, Na⁺, K⁺, and Ca²⁺) on chemical deactivation of commercial SCR catalyst by bromides

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