Honeycomb Metallic substrate (catalyst)
metallic catalyst substrates are made of thin metal foils, flat and corrugated, formed into a honeycomb structure which is placed inside a metal shell, the advantages of metal substrates are their high geometric surface area and low pressure drop associated with the thin walls. The foils in metallic substrates can be brazed/welded together to provide good mechanical durability and resistance to thermal shock. The major disadvantage of high quality metallic substrates is their high cost.
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