Tuesday, January 21, 2014

So what is a catalyst?

By definition, a catalyst is not consumed or used up.

The nature of a catalytic reaction is often defined as:
“A substance, usually present in small amounts related to the reactants, that modifies and especially increases the rate of a chemical reaction without being consumed in the process.”

The catalyst in a catalytic woodstove appliance is a coated ceramic honeycomb through which the exhaust gas is routed. The catalytic coating lowers the ignition temperature of the gases as they pass through. This allows catalytic woodstove appliances to operate at low firing rates while still burning cleanly.
Because the catalyst causes a restriction to gas flow through the appliance, these units always include a by-pass damper into the flue. The damper is opened when the appliance is loaded and until a hot fire is established, then it is closed, forcing the gases through the combustor for extended clean burn.

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