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Youngy Forums Junkie Location: Eskilstuna, Sweden Registered: May 2002	Re: Cat converter legal or not? Tue, 24 September 2002 14:22 Here is a little summary that might add to the discussion here: A catalytic convertor removes the pollutant gases from the exhaust by reducing or oxidising them. Precious metals are used as catalysts in the process, like an alloy of platinum and rhodium (35% and 73% respectively in US). Palladium metal may also be the choice. Reactions (heterogenous catalysis) take place in the convertor. Both NOx and CO are eliminated together by a redox reaction on rhodium catalyst. NOx oxidises CO to CO2, and is reduced to harmless nitrogen gas (N2). CO and CxHy are oxidised by air on platinum catalyst. (C7H16 is used to represent the unburnt hydrocarbon) For all these reactions to happen, the convertor is designed as a 'three-way convertor' and has an oxygen monitor fitted to the engine. The monitor checks the quantity of oxygen into the engine to make sure there is enough oxygen in carrying out oxidation reactions. However for these reactions to take place there cat needs to be at about 200 degress so too far back in the exhaust system and the cat does not do much. Too far forward and it gets too hot and the precious metals in the cat are burnt up. It's quiet a compromise. [Report message to a moderator]

	Subject	Poster	Date
	Cat converter legal or not?	celikar	Mon, 23 September 2002 22:27
	Re: Cat converter legal or not?	CrAiGzEE	Mon, 23 September 2002 22:30
	Re: Cat converter legal or not?	haggis	Mon, 23 September 2002 23:35
	Re: Cat converter legal or not?	justcallmefrank	Tue, 24 September 2002 00:32
	Re: Cat converter legal or not?	BlackSupra	Tue, 24 September 2002 00:40
	Re: Cat converter legal or not?	BlackSupra	Tue, 24 September 2002 00:43
	Re: Cat converter legal or not?	celikar	Tue, 24 September 2002 02:56
	Re: Cat converter legal or not?	SUPRAGTE	Tue, 24 September 2002 12:30
	Re: Cat converter legal or not?	Youngy	Tue, 24 September 2002 14:22
	Re: Cat converter legal or not?	Cool1	Tue, 24 September 2002 14:22
	Re: Cat converter legal or not?	Grega	Tue, 24 September 2002 20:45
	Re: Cat converter legal or not?	SUPRAGTE	Wed, 25 September 2002 12:18
	Re: Cat converter legal or not?	BlackSupra	Wed, 25 September 2002 12:30
	Re: Cat converter legal or not?	Cool1	Wed, 25 September 2002 13:58
	Re: Cat converter legal or not?	justcallmefrank	Wed, 25 September 2002 14:12
	Re: Cat converter legal or not?	EMP-2TG	Thu, 26 September 2002 00:49
	Re: Cat converter legal or not?	SUPRAGTE	Thu, 26 September 2002 15:32
	Re: Cat converter legal or not?	SUPRAGTE	Thu, 26 September 2002 15:36
	Re: Cat converter legal or not?	Cool1	Thu, 26 September 2002 22:46
	Re: Cat converter legal or not?	SUPRAGTE	Fri, 27 September 2002 01:11
	Re: Cat converter legal or not?	MREMIL	Fri, 27 September 2002 01:20
	Re: Cat converter legal or not?	GIN51E	Fri, 27 September 2002 03:11
	Re: Cat converter legal or not?	Cool1	Fri, 27 September 2002 02:22
	Re: Cat converter legal or not?	Grant	Fri, 27 September 2002 02:51
	Re: Cat converter legal or not?	SUPRAGTE	Fri, 27 September 2002 03:11
	Re: Cat converter legal or not?	justcallmefrank	Fri, 27 September 2002 03:19
	Re: Cat converter legal or not?	EMP-2TG	Fri, 27 September 2002 03:20
	Re: Cat converter legal or not?	celikar	Fri, 27 September 2002 04:37
	Re: Cat converter legal or not?	RWDboy	Fri, 27 September 2002 05:03
	Re: Cat converter legal or not?	SUPRAGTE	Fri, 27 September 2002 23:49
	Re: Cat converter legal or not?	Bugman	Sat, 28 September 2002 06:13

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