活性组分掺杂对低温锰基催化剂脱硝性能的影响

摘要

Single manganese salt active component was modified by doping Ce and mixing manganese salts, and the mixing method with step-by-step was used to prepare a series of catalysts.The activity testing of catalysts presented that mixing manganese salts and doping Ce could both improve the activity of manganese base catalysts at low temperature, and the former′s effect was better than the latter.It was found through comparing that mechanical strength of catalyst was greatly increased by doping of active component.And BET results showed that the surface texture of manganese based catalyst with being doped and modified was greatly improved.XRD results of catalysts indicated that the active components of manganese base catalyst calcined at 500 ℃ existed in the form of amorphous state.Through analyzing NH3-TPD and H2-TPR of modified catalysts, compared to Ce doping into single manganese salt, surface acid amount and redox properties of catalyst was more significantly improved by the doping form of mixing manganese salts.%利用Ce和锰盐复配对单组分锰盐活性组分进行掺杂改性,并采用分步共混法制备一系列催化剂.催化剂活性测试显示锰盐复配及Ce的掺杂均能提高锰基催化剂低温活性,且锰盐复配形式的掺杂对催化剂低温活性提高更多.通过对比各催化剂强度状况发现活性组分的掺杂使催化剂的机械强度得到很大提高,而BET结果显示掺杂改性后的锰基催化剂其表面织构得到较大改善.催化剂的XRD结果表明500 ℃焙烧的锰基催化剂活性组分均以无定形态存在.通过对改性后的催化剂进行NH3-TPD和H2-TPR分析,发现相比于Ce对单组分锰盐的掺杂改性,锰盐复配形式的掺杂改性对催化剂表面酸量和氧化还原性能的提高更加显著.