公开(公告)号：US07081231B1

公开(公告)日：2006-07-25

申请号：US09708863

申请日：2000-11-08

申请人： Christopher L. Aardahl ,  Mari Lou Balmer-Miller ,  Ashok Chanda ,  Craig F. Habeger ,  Kent A. Koshkarian ,  Paul W. Park

发明人： Christopher L. Aardahl ,  Mari Lou Balmer-Miller ,  Ashok Chanda ,  Craig F. Habeger ,  Kent A. Koshkarian ,  Paul W. Park

IPC分类号： B01D50/00 ,  F01N3/10

CPC分类号： B01D53/9445 ,  B01D53/9409 ,  Y02T10/22

摘要： The present disclosure pertains to a system and method for treatment of oxygen rich exhaust and more specifically to a method and system that combines non-thermal plasma with a metal doped γ-alumina catalyst. Current catalyst systems for the treatment of oxygen rich exhaust are capable of achieving only approximately 7 to 12% NOx reduction as a passive system and only 25–40% reduction when a supplemental hydrocarbon reductant is injected into the exhaust stream. It has been found that treatment of an oxygen rich exhaust initially with a non-thermal plasma and followed by subsequent treatment with a metal doped γ-alumina prepared by the sol gel method is capable of increasing the NOx reduction to a level of approximately 90% in the absence of SO2 and 80% in the presence of 20 ppm of SO2. Especially useful metals have been found to be indium, gallium, and tin.

摘要翻译： 本公开涉及用于处理富氧排气的系统和方法，更具体地涉及将非热等离子体与金属掺杂的γ-氧化铝催化剂组合的方法和系统。 用于处理富氧排气的当前催化剂体系能够仅实现约7-12％的NO x x还原作为被动体系，并且当补充的烃还原剂注入到惰性体系中时仅减少25-40％ 排气流。 已经发现，首先用非热等离子体处理富氧废气，随后用溶胶凝胶法制备的掺杂金属的γ-氧化铝进行后处理，可以增加NO x 在20ppm的SO 2存在下，在不存在SO 2的情况下还原至约90％的水平和80％的水平。 已经发现特别有用的金属是铟，镓和锡。