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<p>[QUOTE=&quot;Oldhoopster, post: 4554740, member: 84179&quot;]The Pt/Rh/Pd metals are applied to a ceramic substrate (honeycomb) as a washcoat that also contains other ceramic materials. The cordierite substrates are engineered with a controlled level of porosity that allows the washcoat to stick to the structure and the extra ceramics help the catalyst adhere when heated.&nbsp; </p><p><br /></p><p>The trick is to grind the cordierite substrates fine enough so you can chemically separate the precious metal catalyst.&nbsp; </p><p><br /></p><p>Better living through chemistry[/QUOTE]</p><p><br /></p>

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