Nox storage catalyst and method for preparing the same
AssigneesHyundai Motor Company, Kia Corporation, Industry Foundation of Chonnam National University
InventorsDalyoung Yoon, Soon Hee Park, Sung June Cho
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Abstract
A NOX storage catalyst includes CHA zeolite, a transition metal ion-exchanged in the CHA zeolite, and a rare earth metal that is different the transition metal and is supported on the CHA zeolite. A method for preparing a NOX storage catalyst includes preparing a synthetic mother liquid including a zeolite raw material as a source of silica and alumina, a structure-inducing material, a complexing material, and a solvent, reacting the synthetic mother liquid to prepare a CHA zeolite, and supporting a transition metal and a rare earth metal that is different from the transition metal on the prepared CHA zeolite.
Claims17
A NOX storage catalyst comprising:
- CHA zeolite;
- a transition metal ion-exchanged in the CHA zeolite;
- and
- a rare earth metal that is different from the transition metal and is supported on the CHA zeolite;
- wherein the transition metal consists essentially of Cu;
- wherein the rare earth metal consists essentially of La;
- wherein the NOX storage catalyst comprises about 16 wt % to about 30 wt % of the La based on a total weight of the NOX storage catalyst;
- and
- wherein the NOX storage catalyst comprises about 1.5 wt % to about 3 wt % of the Cu based on the total weight of the NOX storage catalyst.
A NOX storage catalyst comprising:
- CHA zeolite;
- a transition metal ion-exchanged in the CHA zeolite;
- and
- a rare earth metal that is different from the transition metal and is supported on the CHA zeolite;
- wherein the transition metal consists essentially of Cu;
- wherein the rare earth metal consists essentially of Ce;
- wherein the NOX storage catalyst comprises about 16 wt % to about 30 wt % of the Ce based on a total weight of the NOX storage catalyst;
- and
- wherein the NOX storage catalyst comprises about 1.9 wt % to about 3 wt % of the Cu based on the total weight of the NOX storage catalyst.
A NOX storage catalyst comprising:
- CHA zeolite;
- Cu ion-exchanged in the CHA zeolite, wherein the NOX storage catalyst comprises about 1.5 wt % to about 3 wt % of the Cu based on a total weight of the NOX storage catalyst;
- and
- a rare earth metal supported on the CHA zeolite, wherein the rare earth metal consists essentially of La such that the NOX storage catalyst comprises about 16 wt % to about 30 wt % of the La based on the total weight of the NOX storage catalyst or wherein the rare earth metal consists essentially of Ce such that the NOX storage catalyst comprises about 16 wt % to about 30 wt % of the Ce based on the total weight of the NOX storage catalyst;
- wherein the NOX storage catalyst exhibits physical properties resulting from having been prepared by a method comprising:
- preparing a synthetic mother liquid including a zeolite raw material as a source of silica and alumina, a structure-inducing material, a complexing material, and a solvent, wherein the structure-inducing material comprises benzyl trimethyl ammonium chloride;
- reacting the synthetic mother liquid to prepare the CHA zeolite;
- and
- supporting the Cu and the rare earth metal on the prepared CHA zeolite.
Dependencies are inferred from the claim text.