负载Mn型类水滑石结构催化剂同时催化净化NO_(x)和o-DCB研究

SIMULTANEOUS CATALYTIC PURIFICATION OF NO_(x) AND O-DCB WITH SUPPORTED Mn HYDROTALCITE-LIKE STRUCTURE CATALYST

采用共沉淀法成功制备了钴铁层状双氢氧化物结构载体(CoFe-LDH),并采用浸渍法负载活性组分Mn经煅烧制备不同Mn负载量的类水滑石结构催化剂——Mn_(x)CoFe-LDO催化剂(其中x为硝酸锰与CoFe-LDH的质量比),探究了催化剂对典型工业尾气中氮氧化物(NO_(x))和含氯挥发性有机化合物(CVOCs)的催化性能,并对催化剂进行XRD、H_(2)-TPR、NH_(3)-TPD及TEM-EDX mapping等表征。结果表明:Mn的加入会极大提高钴铁层状氧化物(CoFe-LDO)的催化性能,其中质量比为0.25的催化剂活性最高,测试温度范围内脱硝率维持在90%以上,且300℃邻二氯苯(o-DCB)的去除率可达到95.4%。在该配比下制备的催化剂活性组分Mn的分散性最好,且表面酸性位数量及氧化还原性能最佳。

The cobalt-iron layered double hydroxide structure carrier(CoFe-LDH) was successfully prepared by the co-precipitation method, and the active component Mn was loaded by the impregnation method and calcined to prepare the hydrotalcite-like structure catalyst Mn_(x)CoFe-LDO catalyst with different Mn loadings(Where x was the mass ratio of manganese nitrate solution to CoFe-LDH). The catalytic performance of the catalyst on nitrogen oxides(NO_(x)) and chlorinated volatile organic compounds(CVOCs) in typical industrial exhaust gas was explored, and the catalyst was characterized by XRD, H_(2)-TPR, NH_(3)-TPD and TEM-EDX mapping. The results showed that the addition of Mn greatly improved the catalytic performance of CoFe-LDO. Among them, the catalyst with a mass ratio of 0.25 had the highest activity. The denitration efficiency was maintained above 90% in the test temperature range, and the efficiency of o-DCB removal at 300 ℃ could be up to 95.4%. This was mainly due to the best dispersibility of the active component Mn of the catalyst prepared under this ratio, and the best redox performance.