The crystal structure of TiO₂ strongly influences the physiochemical properties of supported active sites and thus the catalytic performance of the as-synthesized catalyst. Herein, we synthesized TiO₂ with different crystal forms (R = rutile, A = anatase, and B = brookite), which were used as supports to prepare vanadium-based catalysts for Hg⁰ oxidation. The Hg⁰ oxidation efficiency over V₂O₅/TiO₂-B was the best, followed by V₂O₅/TiO₂-A and V₂O₅/TiO₂-R. Further experimental and theoretical results indicate that gaseous Hg⁰ reacts with surface-active chlorine species produced by the adsorbed HCl and the reaction orders of Hg⁰ oxidation over V₂O₅/TiO₂ catalyst with respect to HCl and Hg⁰ concentration were approximately 0 and 1, respectively. The excellent Hg⁰ oxidation efficiency over V₂O₅/TiO₂-B can be attributed to lower redox temperature, larger HCl adsorption capacity, and more oxygen vacancies. This work suggests that to achieve the best simultaneous removal of NO_x and Hg⁰ on state-of-the-art V₂O₅/TiO₂ catalyst, a combination of anatase and brookite TiO₂-supported vanadyl tandem catalysts is supposed to be employed in the SCR reactor, and the brookite-type catalyst should be on the downstream of the anatase-based catalyst due to the inhibition of NH₃ on Hg⁰ oxidation.

中文翻译：

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V2O5/TiO2 催化剂上载体对 Hg0 氧化的结构导向作用揭示了 SCR 反应器中 NOx 和 Hg0 的同时控制

_{TiO 2}的晶体结构强烈影响负载的活性位点的物理化学性质，从而影响所合成催化剂的催化性能。在此，我们合成了具有不同晶型（R = 金红石、A = 锐钛矿和 B = 板钛矿）的 TiO ₂，​​用作载体制备用于 Hg ⁰氧化的钒基催化剂。_{V 2} O ₅ /TiO ₂ -B上的Hg ⁰氧化效率最好，其次是V ₂ O ₅ /TiO ₂ -A和V ₂ O ₅ /TiO ₂-R。进一步的实验和理论结果表明，气态 Hg ⁰与吸附的 HCl 产生的表面活性氯物质发生反应，在 V ₂ O ₅ /TiO _{2催化剂上的 Hg} ⁰氧化反应相对于 HCl 和 Hg ⁰浓度的反应级数约为 0和 1，分别。V ₂ O ₅ /TiO ₂ -B 上优异的 Hg ⁰氧化效率可归因于较低的氧化还原温度、较大的 HCl 吸附容量和更多的氧空位。这项工作表明，要同时去除 NO _x和 Hg ⁰在最先进的 V ₂ O ₅ /TiO ₂催化剂上，锐钛矿和板钛矿 TiO ₂负载的钒串联催化剂的组合应该用于 SCR 反应器，板钛矿型催化剂应该在由于NH ₃对Hg ⁰氧化的抑制，锐钛矿催化剂的下游。