研究报告

  • 胡明江,吕春旺.La1-xCexFe0.7Co0.3O3-δ网状多层纳米纤维对碳烟催化燃烧性能研究[J].环境科学学报,2018,38(10):3927-3936

  • La1-xCexFe0.7Co0.3O3-δ网状多层纳米纤维对碳烟催化燃烧性能研究
  • Multilayer arrangements of La1-xCexFe0.7Co0.3O3-δ nanofiber webs for effective soot catalytic combustion
  • 基金项目:河南省自然科学基金(No.182300410264);河南省科技攻关计划项目(No.182102210225);河南省高等学校重点科研项目(No.18A470002)
  • 作者
  • 单位
  • 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
  • 华北电力大学能源动力与机械工程学院, 保定 071003
  • 摘要:采用静电纺丝法制备了一系列钙钛矿催化剂La1-xCexFe0.7Co0.3O3-δx=0、0.1、0.2、0.3和0.4),并采用XRD、SEM、FT-IR、H2-TPR和O2-TPD等技术分析了Ce掺杂量对催化剂结构、微观形貌及理化特性的影响.同时,采用程序升温氧化(TPO)技术评价了催化剂对碳烟的催化燃烧活性,探讨了催化剂对碳烟的催化燃烧机理.结果表明:在La1-xCex Fe0.7Co0.3O3-δ中掺杂适宜的Ce有助于提高催化剂活性,改善催化剂比表面积和孔容积.在催化剂与碳烟松散接触条件下,当Ce掺杂量(质量百分比)为0.3时,所制备的La0.7Ce0.3Fe0.7Co0.3O3-δ对碳烟的起燃温度(Tig)、最大燃烧温度(Tm)和燃尽温度(Tf)分别为329.5、409.8和421.1℃,呈现良好的催化氧化活性.碳烟最大转化效率为98.7%,平均活化能为123 kJ·mol-1,CO2选择率为98.2%,实现了对柴油机碳烟排放污染物有效"过滤+催化燃烧"的双重目标.
  • Abstract:Perovskite-type La1-xCexFe0.7Co0.3O3-δ(x=0,0.1,0.2,0.3,0.4)catalysts were prepared by electrospinning method, and the catalysts were characterized by x-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared spectroscopy(FTIR), X-ray photoelectron spectroscopy (XPS), H2-temperature-programmed reduction (H2-TPR) and O2-temperature-programmed desorption (O2-TPD).The catalysts performances were optimized in a micro fixed-bed reactor through doping appropriate amount of Ce into A sites of La1-xCexFe0.7Co0.3O3-δ. Soot catalytic combustion activities of catalysts were evaluated by temperature programmed oxidation (TPO). The test results showed that catalytic activity of La1-xCex Fe0.7Co0.3O3-δ was improved through doping appropriate amount of Ce, and the specific surface area and pore volume of catalysts increased accordingly. When doping amount of Ce was 0.3, the resultant La0.7Ce0.3Fe0.7Co0.3O3-δ presented good catalytic combustion activity for soot. Under the loose contact condition of catalyst and soot, light-off temperature (Tig), maximum combustion temperature(Tm) and total conversion temperature(Tf) of La0.7Ce0.3Fe0.7Co0.3O3-δ were 329.5, 409.8 and 421.1℃, respectively. Maximum soot conversion efficiency was 98.7%, average activation energy was 123 kJ·mol-1, and CO2 selectivity rate reached 98.2%. Therefore, it is verified that La0.7Ce0.3Fe0.7Co0.3O3-δ catalyst had better catalytic combustion activity in reducing soot emissions from diesel engine exhaust.

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