Low temperature NOx adsorber with enhanced regeneration efficiency
AssigneeBASF SE
InventorsXinyi Wei, Evan Vincent Miu, Xiaoming Xu, Jia Cheng Liu, Stefan Maurer
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Abstract
The present disclosure provides Low Temperature NOx-Absorber (LT-NA) catalyst compositions, catalyst articles, and an emission treatment system for treating an exhaust gas, each including the LT-NA catalyst compositions. Further provided are methods for reducing a NOx level in an exhaust gas stream using the LT-NA catalyst articles. In particular, the LT-NA catalyst compositions include a first zeolite, a first palladium component, and a plurality of platinum nanoparticles. The LT-NA catalyst compositions exhibit enhanced regeneration efficiency with respect to NOx adsorption capacity, even after hydrothermal aging.
Claims31
A Low Temperature NOx Adsorber (LT-NA) catalyst composition comprising:
- a first zeolite;
- a first palladium component;
- and
- a plurality of platinum nanoparticles;
- wherein at least a portion of the first palladium component is ion-exchanged in the first zeolite,
- and at least a portion of the platinum nanoparticles are dispersed on the first zeolite.
A Low Temperature NOx Adsorber (LT-NA) catalyst composition comprising:
- a first zeolite;
- a first palladium component;
- a plurality of platinum nanoparticles;
- and
- a first refractory metal oxide component
- wherein at least a portion of the first palladium component is ion-exchanged in the first zeolite, and
- a ratio of the first zeolite to the first refractory metal oxide component by weight is from about 10 to about 0.1.
A Low Temperature NOx Adsorber (LT-NA) catalyst composition comprising:
- a first zeolite;
- a first palladium component;
- a plurality of platinum nanoparticles;
- and
- a second zeolite,
- wherein at least a portion of the first palladium component is ion-exchanged in the first zeolite,
- the second zeolite is a large pore zeolite having a framework type selected from the group consisting of AFT, AFR, AFS, AFY, ASV, ATO, ATS, BEA, BEC, BOG, BPH, BSV, CAN, CON, CZP, DFO, EMT, EON, EZT, FAU, GME, GON, IFR, ISV, ITG, IWR, IWS, IWV, IWW, JSR, LTF, LTL, MAZ, MEI, MOR, MOZ, MSE, MTW, NPO, OFF, OKO, OSI, RON, RWY, SAF, SAO, SBE, SBS, SBT, SEW, SFE, SFO, SFS, SFW, SOF, SOS, STO, SSF, SSY, USI, UWY, VET and mixtures or intergrowths thereof;
- and
- a portion of the first palladium component is ion-exchanged in the second zeolite.
Dependencies are inferred from the claim text.