Bench testing catalysts using know gas mixture

[Wicsteve]

We are a manufacture who uses wireform or rolled metallic catalysts in mufflers used on various small engines, chain saws, etc. The catalyst elements are purchased as component parts from various manufactures. We're looking for some method to evaluate and monitor (spot check) the performace of production catalyst prior to assemblying them into mufflers.

While evaluating the catalyst on individual engines is possible, problems with engine aging, engine maintenance, and engine performance variability is a real heahache. It was suggested to us that there is a bench test apparatus available that uses propane (or a known gas mixture) to test the catalyst element alone. It was described that the catalyst is first heated, then raw gas is flowed through the catalyst to determine the conversion properties.

I'm looking for the manufacture name of this type of test equipment... and any comments as to the pro and cons of this type of testing.

Thanks.

 

[turbocohen]

Southwest Research Institute put out a good paper a while back that is online.

http://www.crcao.com/reports/recentstudies00-02/08-03475 GJB.pdf

Contact your catalyst mfg and ask them to assist you. Everything you need is off the shelf.

When I was developing CNG engine systems many yrs ago I made my own synthetic feedgas apparatus from scrap exhaust parts and although it looked rough it did the job. We used methane and propane mixtures and throttled the inlet air to manipulate O2 concentration (fed by a scroll fan) along with an A/f meter. We added an old manifold heat control valve downstream of the cat to stabilize pressure and approximate the conditions under the vehicle. A simple anulur combustion ring and an acme furnace igniter lit it off.

Good luck, Turbo