公开(公告)号：US20040198592A1

公开(公告)日：2004-10-07

申请号：US10406891

申请日：2003-04-04

Applicant: ENGELHARD CORPORATION

Inventor： Zhicheng Hu ,  Knut Wassermann ,  Patrick L. Burk ,  Youchang Xie ,  Wei Lin

IPC: B01J023/56

CPC classification number: B01D53/945 ,  B01J21/063 ,  B01J21/066 ,  B01J23/58 ,  B01J35/0006 ,  B01J37/0238 ,  Y02T10/22

Abstract: A support for a catalyst for controlling vehicular exhaust emissions comprising a high surface area refractory metal oxide, e.g., gamma-alumina, having a monomolecular layer of a second oxide selected from the group consisting of titanium dioxide, cerium dioxide and zirconium dioxide. Typically, the monomolecular layer will have a thickness of less than about 10 angstroms. The support may be converted into a vehicular exhaust emission control catalyst by depositing the support on a substrate such as cordierite depositing a precious metal component such as platinum on at least part of the monomolecular layer. Preferably, the catalyst will also contain at least one NOx storage component deposited on at least part of the monomolecular layer. Catalysts prepared using the catalyst supports of the invention exhibit outstanding thermal stability and resistance to sulfur poisoning.

Abstract translation: 一种用于控制车辆废气排放的催化剂的载体，包括具有选自二氧化钛，二氧化铈和二氧化锆的第二氧化物的单分子层的高表面积难熔金属氧化物，例如γ-氧化铝。 通常，单分子层将具有小于约10埃的厚度。 载体可以通过在至少部分单分子层上沉积诸如堇青石的衬底上沉积诸如铂的贵金属组分的载体而转化为车辆废气排放控制催化剂。 优选地，催化剂还将含有至少一个沉积在单分子层的至少一部分上的NOx储存组分。 使用本发明的催化剂载体制备的催化剂表现出优异的热稳定性和耐硫中毒性。