ADSORPTION MATERIAL FOR NITROGEN OXIDES AND EXHAUST EMISSION CONTROL CATALYST.

摘要

An adsorption material exhibiting a superior adsorption capability relative to nitrogen oxides (NO) is constituted by a ceramic of oxide system having an average crystal diameter D, D 500 ANGSTROM such as CeO2. A catalyst is, for example, constituted by CeO2 and zeolite and C content of CeO2 is set to satisfy 10 weight % /= C /= 80 weight %. Zeolite adsorbs hydrocarbon (HC), and HC so adsorbed is oxidized to activated CHO by CeO2. Activated CHO reduces NO adsorbed to CeO2. IMAGE