摘要
采用共沉淀法制备Mn、Ni改性的ZIF-67,并通过碳化氧化衍生制备催化剂.C3H6-SCR性能测试表明,Ni/Mn/CoO_(x)-C在225℃实现了93.2%的NO转化率,N2选择性在225℃后可以保持在86%以上.表征结果显示Ni、Mn共掺杂产生良好的金属协同效应,增加了催化剂表面有效活性物种,包括吸附氧、Ni^(3+)及Mn^(4+)的相对含量,从而提升催化剂的氧化还原性能.同时Ni/Mn/CoO_(x)-C催化剂具有较低的团聚和更丰富的孔结构,使反应物分子在其表面的吸附效率提高,对催化剂的活性有明显促进作用.
Mn-and Ni-modified ZIF-67 was prepared by co-precipitation method,and the catalyst was prepared by carbonation-oxidation derivatization,and the C_(3)H_(6)-SCR performance of the catalyst was evaluated by simulating the flue gas conditions,in which the Ni/Mn/CoO_(x)-C could achieve 93.2%NO conversion at 225℃,and the N2 selectivity could be maintained at more than 86%after 225℃.The catalysts were characterized by a series of characterization tools to verify the effects of the introduction of transition metals Ni and Mn on the catalytic performance of the catalysts.The results showed that the co-doping of Ni and Mn formed a good metal synergistic effect,which increased the relative contents of effective active species on the catalyst surface,including adsorbed oxygen,Ni^(3+)and Mn^(4+),resulting in the enhancement of the catalyst’s redox performance.Meanwhile,the Ni/Mn/CoO_(x)-C catalyst possessed a lower agglomeration and richer pore structure,which led to the increase of the adsorption efficiency of reactant molecules on its surface and thus has an obvious promotion effect on the activity of the catalyst.
作者
李炬星
张津威
宁淑英
胡明涛
苏亚欣
LI Juxing;ZHANG Jinwei;NING Shuying;HU Mingtao;SU Yaxin(College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China)
出处
《分子催化(中英文)》
北大核心
2025年第1期41-52,I0002,共13页
Journal of Molecular Catalysis(China)
基金
国家自然科学基金项目(52276103)。
