新型多孔莫来石纤维陶瓷负载La0.8Sr0.2CoO3-δ钙钛矿催化剂

催化学报 , 2006, 27(11): 940-942.

新型多孔莫来石纤维陶瓷负载La0.8Sr0.2CoO3-δ钙钛矿催化剂

段碧林 ^1, , 曾令可 ^2, , 刘平安 ^3, , 税安泽 ^4, , 王小华 ^5,

1.华南理工大学材料科学与工程学院,广东广州,510640

2.华南理工大学材料科学与工程学院,广东广州,510640

3.华南理工大学材料科学与工程学院,广东广州,510640

4.华南理工大学材料科学与工程学院,广东广州,510640

5.吉首大学化学与化工学院,湖南吉首,416000

基金项目: 国家自然科学基金(50276017) 广东省自然科学基金(2005B10301026)

关键词：多孔莫来石纤维陶瓷 , 钯 , 负载型催化剂 , 一氧化氮 , 一氧化碳 , 氧化

A Novel Porous Mullite Fiber Ceramics as a Support for La0.8Sr0.2CoO3-δ Perovskite Catalysts

Keywords： porous mullite fiber ceramics , palladium , supported catalyst , nitric oxide , carbon monoxide , oxidation

利用空气挤压排液成型法在 1 250 ℃下制得了高孔隙率高热稳定性的莫来石纤维陶瓷. 这种多孔莫来石纤维陶瓷具有较均匀的孔分布,并且孔隙率高达96.22%. 以这种多孔陶瓷为载体制备了负载型La0.8Sr0.2CoO3-δ钙钛矿催化剂,该催化剂对NO氧化CO表现出很好的催化活性和稳定性. 在催化剂中掺入贵金属Pd之后,催化剂的催化活性得到了很大的提高.

An air extrusion molding method for the preparation of mullite fiber ceramics with high porosity and high temperature stability was developed at a calcination temperature of 1 250 ℃. The porous mullite ceramics showed a uniform pore size distribution and a porosity of 96.22%. The porous ceramics was used as the support for perovskite catalysts based on La0.8Sr0.2CoO3-δ, and the catalyst showed excellent activity and stability in the catalytic combustion of NO and CO. Pd doping enhanced the catalyst activity.

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