GB/T 34248-2017: Translated English of Chinese Standard. (GBT 34248-2017, GB/T34248-2017, GBT34248-2017): Performance Test Method of Three-way Catalyst
https://www.chinesestandard.net, 2017年11月17日 - 12 pages
This Standard specifies the test method of light-off temperature, air-fuel ratio and oxygen storage capacity of three-way catalyst for gasoline vehicles. This Standard applies to the three-way catalyst for the purification of the tail gas of vehicles, which is made by using cordierite honeycomb ceramics or metallic honeycombs as base and loading catalyst coating.
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Test Data Processing
Annex A Normative Airspeed Correction of Reaction Mixed Gas
abscissa accordance with Formula accuracy air-to-fuel ratio airspeed at 60 Airspeed Correction burette calculate the conversion Catalyst for Tail catalyst inlet corresponding catalyst inlet temperature catalyst specimen ceramic fibre cotton consecutive test results control and sampling conversion as ordinate conversion temperature Film Flowmeter Comparative Flowmeter Comparative Method fraction of carbon gas analyzer gas of oxidizing-to-reducing gas of vehicles gas pollutant hydrocarbons HC inlet temperature becomes lean burn light-off temperature maintain the airspeed measurement thermocouples mixed see Table nitrogen oxides NOx normal pressure ordinate to plot oxidizing-to-reducing components ratio oxygen storage capacity pollutants carbon monoxide pressure at normal pump mixed gas Raise the temperature rate of 10°C/min ratio and oxygen reaction atmosphere reactor at 10°C/min referenced documents sampling recording system soap film flowmeter specimens for carbon stabilized at 450°C Standard system pressure tail gas temperature becomes stabilized temperature of catalyst test apparatus theoretical air-fuel ratio three-way catalyst value of duration Volume fraction