CATALYST COMPOSITION OF SOx TRAP FOR DIESEL ENGINE AND LEAN BURN GASOLINE ENGINE, METHOD OF USING THE CATALYST COMPOSITION, DIESEL OXIDATION CATALYST HAVING THE CATALYST COMPOSITION, AND CATALYZED SOOT FILTER

摘要

PPROBLEM TO BE SOLVED: To adsorb SOx as metal sulfates under lean conditions and to emit the accumulated SOx as SOSB2/SBunder rich conditions. PSOLUTION: The catalyst composition has a general structure of Cu/A-oxide, wherein the A-oxide represents SiOSB2/SB, Zr-SiOSB2/SB, AlSB2/SBOSB3/SB, TiOSB2/SB-AlSB2/SBOSB3/SB, ZrOSB2/SB, InSB2/SBOSB3/SBor a mixture of these, and the composition is suitable for a SOx trap and regenerable and contains no platinum metal. The catalyst can collects SOx in a lean state. As for the irreversible SOx trap which can be regenerated only in a temperature increasing state in another operation mode, a system containing praseodymia, zirconia-praseodymia, manganese-yttria and a mixture of these is effective to remove SOx. PCOPYRIGHT: (C)2004,JPO