The involvement of Lewis and Brønsted acid sites on V₂O₅/TiO₂ catalyst in the selective catalytic reduction of NO with NH₃ (NH₃-SCR) is under debate. Here, a Li doping strategy is applied to selectively block Brønsted sites, which aims to prepare model catalysts with the same V loading but different ratios of the two acid sites. Time-resolved in situ DRIFTS observation demonstrates that the surface ammonia species pre-adsorbed on Lewis and Brønsted sites can participate equally in the reaction. Consideration of site redistribution in the early stages of the transient reaction is key to accurate measurement of the ammonia consumption rate.

中文翻译：

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时间分辨观察NH3-SCR中V2O5 / TiO2揭示了Brønsted和Lewis酸位的等价性

V ₂ O ₅ / TiO ₂催化剂上的Lewis和Brønsted酸位与NH ₃（NH ₃ -SCR）选择性催化还原NO的关系尚有争议。在这里，Li掺杂策略应用于选择性地封闭布朗斯台德位点，目的是制备具有相同的V负载但两个酸位点比率不同的模型催化剂。时间分辨的原位DRIFTS观察表明，预先吸附在Lewis和Brønsted位置的表面氨物种可以平等地参与反应。在瞬态反应的早期阶段考虑位点重新分布是准确测量氨消耗速率的关键。