【摘 要】
：
基于选择性催化还原(selective catalytic reduction,SCR)催化剂对单质汞的氧化受煤中氯含量的限制,提出利用氯化钙改性SCR催化剂促进单质汞的氧化。在固定床实验台上研究了
【机 构】
：
山东大学燃煤污染物减排国家工程实验室,
论文部分内容阅读
基于选择性催化还原(selective catalytic reduction,SCR)催化剂对单质汞的氧化受煤中氯含量的限制,提出利用氯化钙改性SCR催化剂促进单质汞的氧化。在固定床实验台上研究了不同氯化钙添加量下SCR催化剂对单质汞的氧化性能,进而利用基于密度泛函的理论方法计算了单质汞在催化剂以及改性后的催化剂表面的吸附行为。结果表明,单独的SCR催化剂对单质汞的氧化效果很小,氧化效率仅为7%,添加1%的氯化钙后氧化效率提高到79%。进一步的理论计算表明,氯化钙中的氯容易与V2O5表面的氧结合,起到改性SCR催化剂的作用,而Hg0在改性后的V2O5表面可以生成稳定的HgCl,其中HgCl一部分脱附到烟气中,一部分吸附在催化剂表面,有利于单质汞的氧化。
The oxidation of elemental mercury by selective catalytic reduction (SCR) catalyst is limited by the chlorine content in coal, and the oxidation of elemental mercury is promoted by using SCR catalyst modified by calcium chloride. The oxidation performance of SCR catalyst for elemental mercury with different amount of calcium chloride was studied on a fixed bed test bench. Then the adsorption behavior of elemental mercury on the catalyst and the modified catalyst surface was calculated by the density functional theory method. The results showed that the single SCR catalyst had little effect on the oxidation of elemental mercury, the oxidation efficiency was only 7%, and the oxidation efficiency increased to 79% after adding 1% calcium chloride. Further theoretical calculations show that chlorine in calcium chloride is easily combined with oxygen on the surface of V2O5 to serve as a modified SCR catalyst. Hg0 can form stable HgCl on the surface of modified V2O5, and part of HgCl desorbs Flue gas, part of the adsorption on the catalyst surface, is conducive to the oxidation of elemental mercury.
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