LNT AND SCR CATALYSTS FOR COMBINED LNT-SCR APPLICATIONS

The current invention refers to the LNT and the SCR catalysts designed for combined LNT-SCR applications. LNT catalysts are based on proton-conducting oxides of fluorite structure, namely Ca (Sr)-La-Ce (Zr, Pr) mixed oxides in which up to 40 mol-% of lanthanum is replaced by calcium and/ or strontiu...

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Bibliographic Details
Main Authors CHIGAPOV ALBERT N, CARBERRY BRENDAN PATRICK, UKROPEC ROBERT, SHISHKINA NINA
Format Patent
LanguageEnglish
Published 23.08.2012
Subjects
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
THEIR RELEVANT APPARATUS
TRANSPORTING
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Summary:The current invention refers to the LNT and the SCR catalysts designed for combined LNT-SCR applications. LNT catalysts are based on proton-conducting oxides of fluorite structure, namely Ca (Sr)-La-Ce (Zr, Pr) mixed oxides in which up to 40 mol-% of lanthanum is replaced by calcium and/ or strontium, and up to 66 mol-% of cerium is replaced by zirconium and/or praseodymium, further combined with Pt-Pd or Pt-Pd-Rh precious metal components. SCR catalysts are Cu/zeolite modified by citrate treatment or Cu-Ce, Mn-Ce or Co-Ce/modified zeolite.
Bibliography:Application Number: US201213358708