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CaCl2改性选择性催化还原催化剂氧化汞的

DOI: 10.13334/j.0258-8013.pcsee.2014.26.004, PP. 4469-4475

Keywords: 氯化钙,选择性催化还原(SCR)催化剂,,密度泛函理论,吸附

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Abstract:

基于选择性催化还原(selectivecatalyticreduction,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。

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