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-δ（x=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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