• 关键词：催化剂  喷雾热分解  柴油机  非常规排放  催化降解  甲醇/柴油二元燃料

• 基金项目：国家自然科学基金（No.51376083）；河南省高等学校重点科研项目（No.18A470002）

• 胡明江
• 河南城建学院能源与建筑环境工程学院, 平顶山 467036

• 吕春旺
• 河南城建学院能源与建筑环境工程学院, 平顶山 467036

• 杨师斌
• 河南城建学院能源与建筑环境工程学院, 平顶山 467036

• 王忠
• 江苏大学汽车与交通工程学院, 镇江 212013

• 摘要：采用喷雾热分解法制备了一系列钙钛矿型催化剂La_1-xAl_xFeO₃（x=0、0.3、0.5、0.7），采用X射线衍射仪和扫描电子显微镜，表征了La_1-xAl_xFeO₃相组成和微观形貌，评价了催化剂表面化学形态和催化活性指标.在发动机试验台架上，对甲醇/柴油发动机尾气中的甲醛、甲醇、1，3-丁二烯和N₂O进行了催化降解试验.结果表明：在La_1-xAl_xFeO₃中掺杂适宜量的Al有助于提高催化剂活性，改善催化剂比表面积和孔容积.当Al掺杂量为0.5时，所制备的La_0.5Al_0.5FeO₃催化剂对甲醇、甲醛、丁二烯和N₂O的起燃温度（T₅₀）分别为192、172、180和212℃，完全转化温度（T₉₀）分别为227、205、240和324℃，呈现了良好的低温催化活性.对甲醇、甲醛、1，3-丁二烯和N₂O最大比排放分别为5.2×10³、0.6×10³、0.02和11.23 mg·kW^-1·h^-1.与原发动机比排放相比，转化率达到了92%以上.表明La_0.5Al_0.5FeO₃为适宜用于甲醇/柴油发动机尾气中非常规排放物低温催化降解的催化剂.

• Abstract：Perovskite-type La_1-xAl_xFeO₃(x=0,0.3,0.5,0.7)catalysts were prepared by spray pyrolysis method, and the catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The catalysts performances were optimized in a micro fixed-bed reactor through doping appropriate amount of Al into A sites of La_1-xAl_xFeO₃. The catalytic degenerating tests, including methanol, formaldehyde, 1,3-butadiene and nitrous oxide (N₂O), were carried out on emission test bench of methanol-diesel engine. The results showed that catalytic combustion activity of La_1-xAl_xFeO₃ was improved through doping appropriate amount of Al, and the specific surface area and pore volume of catalysts increased accordingly. When doping amount of Al was 0.5, the resultant La_0.5Al_0.5FeO₃ presented good low-temperature catalytic combustion activity for methanol, formaldehyde, 1,3-butadiene and nitrous oxide (N₂O), their light-off temperature (T₅₀) of La_0.5Al_0.5FeO₃ were 192, 172, 180 and 212℃ respectively, their total conversion temperature (T₉₀) of La_0.5Al_0.5FeO₃ were 227, 205, 240 and 324℃ respectively, and their largest specific emissions were 5.2×10³,0.6×10³,0.02 and 11.23 mg·kW^-1·h^-1 respectively. In addition, their corresponding conversion rates were achieved over 92%. Therefore, it is verified that La_0.5Al_0.5FeO₃ had the best low-temperature catalytic degenerating activity for irregular exhaust emissions of methanol-diesel engine.

• Key words：catalysts  spray pyrolysis process  diesel engine  irregular emissions  catalytic degradation  methanol/diesel dual fuel

• 
  摘要点击次数： 967 全文下载次数： 1459