公开(公告)号：US08389432B2

公开(公告)日：2013-03-05

申请号：US11774281

申请日：2007-07-06

申请人： Lothar Muβmann ,  Nicola Söger ,  Ralf Sesselmann ,  Katja Adelmann ,  Wolfgang Schneider

发明人： Lothar Muβmann ,  Nicola Söger ,  Ralf Sesselmann ,  Katja Adelmann ,  Wolfgang Schneider

IPC分类号： B01J29/04 ,  B01J29/06 ,  C01B33/36 ,  B01D53/46 ,  B01D53/56

CPC分类号： F01N3/2807 ,  B01D53/9418 ,  B01D53/945 ,  B01D2255/20738 ,  B01D2255/20761 ,  B01D2255/50 ,  B01D2255/902 ,  B01J29/072 ,  B01J33/00 ,  B01J37/0244 ,  B01J37/0246 ,  F01N3/2828 ,  Y02A50/2324 ,  Y02A50/2325 ,  Y02T10/22

摘要： Structured automotive catalysts which comprise a plurality of different catalytically active coatings arranged above one another on a support body and whose coatings contain transition metals and porous support materials are well known. Structured automotive catalysts of this type which do not belong to the group of three-way catalysts, in particular, frequently display large selectivity losses after thermal aging processes which can be attributed to the thermally induced migration of transition metal atoms from one layer into the neighboring coating. The introduction of a diffusion barrier which slows or prevents the thermally induced migration of transition metal atoms from one catalytically active layer into the other increases the thermal aging stability of such catalysts significantly.

摘要翻译： 包含多个不同催化活性涂层的结构化汽车催化剂是众所周知的，所述催化活性涂层在支撑体上相互排列并且其涂层含有过渡金属和多孔载体材料。 特别是不属于三元催化剂组的结构型汽车催化剂，特别是在热老化过程之后经常显示出大的选择性损失，这可归因于过渡金属原子从一层到邻近的热诱导迁移 涂层。 引入减缓或阻止过渡金属原子从一个催化活性层向另一个催化活性层的热诱导迁移的扩散阻挡层显着增加了这种催化剂的热老化稳定性。