Diesel engines do NOT use catalytic converters.

Trap Oxidizer, LINKS thread
http://www.peachparts.com/shopforum/showthread.php?t=229522

http://papers.sae.org/831713

http://papers.sae.org/890400/

http://papers.sae.org/850015/

http://subscriptions.sae.org/content/910137/

http://papers.sae.org/910137/