Dear researchers
I want to coat catalyst on Diesel particulate filter.
What do you suggest for this procedure?
right now, our company uses slurry solution and coat with vacuum instrument for monolith, but we are looking for different instrument for coating catalyst on Diesel particulate filter.
It all depends on the nature of particulate filter that you have. If it fabric filter, then I recommend soaking the fabric filer into the solution (slurry containing the suspended catalyst particulates) followed by air drying of the filter.
Hope this helps answer your question.
Professor Yehia Khalil
Yale University
USA
Most catalyzed diesel filters utilize monolithic wall-flow substrates coated with a catalyst. The catalyst lowers the soot combustion temperature, allowing the filter to self-regenerate during periods of high exhaust gas temperature. A number of diesel filter catalysts have been developed, including both noble and base metal formulations. Catalyzed ceramic filters exhibit very good PM filtration efficiencies, but are characterized by relatively high exhaust gas pressure drop. In the catalyzed diesel particulate filter (CDPF), a catalyst is applied onto the filter media to promote chemical reactions between components of the gas phase and the soot (carbon) collected in the filter. The main purpose of the catalyst is to facilitate passive regeneration of the filter by enabling the oxidation of diesel particulate matter under exhaust temperatures experienced during regular operation of the engine/vehicle, typically in the 300-400°C range. In the absence of the catalyst, particulates can be oxidized at appreciable rates only at temperatures around 550-650°C, which can occur only at full load conditions in the diesel engine and in most cases are rarely seen during real-life operation.
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