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US 11,633,726 B2Granted
Zeolite with reduced extra-framework aluminum
AssigneeBASF SE
InventorsIvan Petrovic, Subramanian Prasad, Joseph Palamara
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Abstract
The present disclosure generally provides a catalyst composition comprising a zeolite containing iron and/or copper with a reduced amount of extra-framework aluminum. The catalyst composition is useful to catalyze the reduction of nitrogen oxides in exhaust gas in the presence of a reductant.
Claims23
An SCR catalyst composition comprising:
- a metal-containing molecular sieve comprising a zeolitic framework of silicon and aluminum atoms;
- and
- extra-framework aluminum atoms that are present in an amount of about less than 15% based on the total integrated peak intensity determined by 27Al NMR of aluminum species present in the zeolite as measured prior to addition of the metal;
- wherein the zeolitic surface area of the catalyst composition ranges from 120 m2/g to 250 m2/g;
- wherein the zeolitic framework is selected from AEI, AFT, AFV, AFX, AVL, CHA, DDR, EAB, EEI, ERI, IFY, IRN, KFI, LEV, LTA, LTN, MER, MWF, NPT, PAV, RHO, RTE, RTH, SAS, SAT, SAV, SFW, TSC, UFI, and combinations thereof;
- and
- wherein the molecular sieve has a silica to alumina molar ratio ranging from 20 to 100.
4 more elements
Dependencies are inferred from the claim text.