HIGH-ACTIVITY CATALYST FOR CLEANING CAR EXHAUST GAS IN REDUCING ATMOSPHERE

摘要

PPROBLEM TO BE SOLVED: To provide a catalyst having catalytic cleaning activity prevented from being lowered when the combustion state of an engine is changed to an A/F of a rich atmosphere. PSOLUTION: The catalyst contains, in a catalyst coated layer, an OSC material capable of emitting 0.4%-or-higher OSB2/SB, detected as COSB2/SB, continuously for 30 s or longer in the OSC capability evaluation test. The OCS capability evaluation test comprises laying 3.0 g of an OSC material in an evaluation instrument through which a model gas flows, raising the temperature to 600C at a programming rate of 20C/min, pretreating the material by exposing to the atmosphere of 1%-OSB2/SB/NSB2/SB, 10 L/min, for 30 min, measuring the concentration of COSB2/SBin the outlet gas at 600C 30 min after switching to the atmosphere of 2%-CO/NSB2/SB, 10 L/min, in order to evaluate the OSC capability of the catalyst. PCOPYRIGHT: (C)2009,JPO&INPIT