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| 水热老化对天然气发动机TWC性能影响的试验研究 |
| Experimental Study on Effect of Hydrothermal Aging on Performance of TWC for Natural Gas Engine |
| 关键词:三元催化器 老化温度 水蒸气含量 理化性质 微观结构 |
| Key Words:Three-way catalytic converter Aging temperature Water vapor content Physical and chemical properties Microstructure |
| 基金项目:内燃机与动力系统全国重点实验室开放课题(skler-202104) |
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| 摘要:利用水热老化试验装置开展了催化剂小样的水热老化试验,分析了催化剂在水热老化前后起燃性能的变化规律,利用 X 射线光电子能谱仪、X 射线衍射仪、N2 吸脱附与透射电子显微镜等测试仪器研究了老化温度和老化气氛(水含量)对催化剂活性、表面化学状态以及微观结构的影响。试验结果表明,老化温度对催化剂理化特性的影响较大,随着老化温度的提高,催化剂的氧空位含量减少,储氧能力下降,助剂的粒径变大,比表面积变小,孔径变大,催化剂活性降低；老化气氛中水含量的变化对催化剂理化特性的影响较小,当水含量为10%时,催化剂的活性最高,此时催化剂的储氧能力较高,比表面积最大,表明适宜的水热老化有利于催化剂性能提升。 |
| Abstract:Hydrothermal aging test of catalyst samples was carried out with hydrothermal aging test device, and the variational laws in the ignition performance of the catalysts before and after hydrothermal aging were analyzed. The effects of aging temperature and atmosphere (water content) on catalyst activity, surface chemical state and microstructure were studied by X-ray photoelectron spectrometer, X-ray diffractometer, N2 physical adsorption and transmission electron microscope. The results show that the aging temperature has a great influence on the physicochemical properties of the catalyst. With the increase of aging temperature, the oxygen vacancy content of the catalyst decreases, the oxygen storage capacity decreases, the particle size of the auxiliary agent increases, the specific surface area decreases, the pore size increases, and the activity of the catalyst decreases. The change of water content in the aging atmosphere has little influence on the physicochemical properties of the catalyst. When the water content is 10%, the activity of the catalyst is the highest, the oxygen storage capacity of the catalyst is higher, and the specific surface area is the largest, which indicates that the appropriate hydrothermal aging is conducive to the improvement of catalyst performance. |
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