Catalyst deactivation deduced by alkali metals remains an austere challenge for CO selective catalytic reduction of NO (CO-SCR). Herein, the acidified SiO₂ supported Fe-based bimetal oxide catalyst was synthesized after active component screening and carrier acidification. The obtained FeCu-H catalyst exhibited excellent resistance to high-level alkali poisoning, even at low temperatures, with 78% NO conversion and 83% CO conversion achieved under 150 °C and a 1:1 molar ratio of Na to active metals. Characterizations and density functional theory (DFT) simulations revealed that the deactivation mechanism of CO-SCR catalysts by alkali metals can be ascribed to the deteriorated physicochemical properties, including crystallinity, specific surface area and pore structure, proportion of high-valence metals, NO adsorption and activation capacity, formation of oxygen vacancies, quantity of acid sites, and reducibility. Notably, the acidified carrier exhibited remarkable mitigation of these undesirable effects, thereby enhancing the CO-SCR activity. Our findings provide an inspirational strategy for developing reliable alkali-resistant SCR catalysts.

中文翻译：

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抗高碱中毒酸化SiO2负载铁基双金属氧化物催化剂用于CO选择性催化还原NO脱除NOx


碱金属引起的催化剂失活仍然是 CO 选择性催化还原 NO (CO-SCR) 的严峻挑战。本文通过活性组分筛选和载体酸化，合成了酸化的SiO ₂ 负载铁基双金属氧化物催化剂。所获得的FeCu-H催化剂即使在低温下也表现出优异的抗重度碱中毒能力，在150℃和Na与活性金属摩尔比为1:1的条件下，NO转化率达到78%，CO转化率达到83%。表征和密度泛函理论（DFT）模拟表明，碱金属对CO-SCR催化剂的失活机制可归因于理化性能的恶化，包括结晶度、比表面积和孔结构、高价金属比例、NO吸附和活化能力、氧空位的形成、酸位点的数量和还原性。值得注意的是，酸化载体表现出显着减轻这些不良影响，从而增强 CO-SCR 活性。我们的研究结果为开发可靠的耐碱 SCR 催化剂提供了鼓舞人心的策略。