The low content of hydrogen chloride (HCl) in flue gas is difficult to meet the request of Hg⁰ removal. Here, a small amount of Cl was doped into the crystal lattice of Cu₂O nanocrystals (Cl-Cu₂O), presenting excellent Hg⁰ removal efficiency in chlorine-free coal combustion flue gas. SEM, XRD, BET, and XPS characterizations revealed well crystal morphology and structure of Cl-Cu₂O catalyst. Besides, Cl-Cu₂O had smaller sizes and higher BET surface area compared with Cu₂O. Hg⁰ removal behaviors were studied using a lab-scale fixed-bed reactor. After doping Cl, Hg⁰ removal efficiency was improved obviously and could reach nearly 100% above 150 ℃, indicating chlorine incorporated into the catalyst lattice had a better role for Hg⁰ removal. Besides, gas composition effect on Hg⁰ removal was analyzed. Cl-Cu₂O had high sulfur resistance capacity, and Hg⁰ removal efficiency can still reach above 90% even at 2000 ppm SO₂. O₂ played a critical role in the Hg⁰ removal reaction. Furthermore, a plausible mechanism for Hg⁰ removal was analyzed. Doping Cl into the lattice of Cu₂O nanocrystals was beneficial for the activation of molecular oxygen, and generated reactive oxygen species can further activate Cl to participate in the Hg⁰ removal reaction.

烟气中氯化氢（HCl）含量低，难以满足去除Hg ⁰的要求。在这里，少量的Cl被掺杂到Cu ₂ O纳米晶体（Cl-Cu ₂ O）的晶格中，在无氯煤燃烧烟气中表现出优异的Hg ⁰去除效率。SEM、XRD、BET 和 XPS 表征揭示了 Cl-Cu ₂ O 催化剂的良好晶体形态和结构。此外，CL-的Cu ₂与铜相比ö有更小的尺寸和更高的BET表面积₂ O.汞柱⁰使用实验室规模的固定床反应器中除去的行为进行了研究。掺杂 Cl、Hg ^{0 后}去除效率明显提高，在150℃以上可达近100%，说明掺入催化剂晶格的氯对Hg ⁰去除效果更好。此外，分析了气体成分对Hg ⁰去除的影响。Cl-Cu ₂ O具有较高的抗硫能力，即使在2000 ppm SO _{2 下}，Hg ⁰去除效率仍可达到90%以上。O ₂在Hg ⁰去除反应中起关键作用。此外，还分析了去除Hg ⁰的合理机制。将 Cl 掺杂到 Cu ₂的晶格中O纳米晶有利于分子氧的活化，产生的活性氧可以进一步活化Cl参与Hg ⁰去除反应。