| 简介 |
Catalyst manufactured by loading first noble metal on a support and loading second noble metal on a second support, preparing a coating containing both components on a carrier and impregnating the catalyst layer with a NOx adsorbing material such as alkaline (earth) metal or rare earth metal compounds. Preferably Pt on alumina/ceria and Rh on an oxide of Mn, Co, Ti or Fe are used. The NOx absorbing material is preferably Ba. Optionally the catalyst contains a second layer of Pt, Rh/zeolite after which both layers are impregnated with the NOx adsorbing compound. |
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