摘要
考察了不同碱土金属(Mg、Ca、Ba)改性对PdO/γ-Al_2O_3催化剂甲烷催化燃烧性能的影响。结果表明,碱土金属改性后,PdO/γ-Al_2O_3催化剂的甲烷催化燃烧起燃活性均有不同程度的提高,活性顺序为Ca>Mg>Ba。采用X射线衍射、H_2程序升温还原和CH_4程序升温还原等方法对催化剂进行了表征。碱土金属改性后,其与Al_2O_3载体间的相互作用有助于促进PdO微粒团聚,形成晶相PdO,晶相PdO物种对甲烷的活化氧化能力更强,是影响催化剂起燃活性的主要活性位。
Influence of alkaline earth metals （Mg,Ca, Ba） modification on behaviors of PdO/γ-Al2O3 catalyst for methane combustion was investigated. The results showed that PdO/γ-Al2O3 modified by alkaline earth metals （ Mg, Ca, Ba） exhibited enhanced light-off activity in following sequence ： Ca 〉 Mg 〉 Ba. The catalysts were characterized by XRD, HE-TPR and CH4-TPR. The results indicated that interaction between alkaline earth metals and alumina carrier promoted agglomeration of PdO particles to form PdO crystals, which exhibited higher activity for methane oxidation.
出处
《工业催化》
CAS
2010年第12期13-18,共6页
Industrial Catalysis
基金
国家自然科学基金资助项目(20703037)
