【摘要】 在超声波条件下,采用等体积浸渍法制备了负载型催化剂PdO/CeO₂-Al₂O₃,研究了其甲烷燃烧催化性能,并考察了活化方式对催化性能的影响。应用H₂-TPR和O₂-TPD法,分别表征了催化剂表面氧的反应与吸附性能。以H₂S为硫源考察了催化剂的抗硫中毒性能以及硫中毒模式。结果表明:快速活化的PdO/CeO₂-Al₂O₃催化剂具有良好的反应活性和抗H2S中毒性能。硫含量测试显示,经过高温再生后,催化剂表面仍有大量硫物种存在,说明高温活化并不能使催化剂的活性完全恢复。更多还原

【Abstract】 The supported catalyst PdO/CeO₂-Al₂O₃ was prepared by the incipient wetness impregnation method under ultrasonic conditions, and its catalytic performance of methane combustion and the effect of activation modes on the catalytic performance were investigated. The properties of reaction and adsorption of oxygen species on catalytic surface were characterized by H₂-TPR and O₂-TPD. The sulfur tolerance and sulfur poisoning mode of the catalyst were investigated by using H₂ S as the sulfur source. The results indicated that the fast-activated PdO/CeO₂-Al₂O₃ catalyst had good reactivity and anti-H₂ S poisoning performance. Sulfur content test results showed that after high temperature regeneration, there were still a large number of sulfur species on the catalyst surface,indicating that high temperature activation did not completely restore the activity of the catalyst.更多还原