Patent ID: 11883804
Assignee: PACIFIC INDUSTRIAL DEVELOPMENT CORPORATION
Field: Chemical engineering (Chemistry)
Classification: CPC B  C  F | IPC B  C  F

Claim 0:
1. A method of forming a catalyst for use in low temperature NOx conversion, wherein the method comprises the steps of:
forming an SSZ-13 zeolite containing one or more metal cations as part of the SSZ-13 zeolite according to a method comprising the steps of:
a) providing a source of silica;
b) providing a source of alumina;
c) providing a structure directional agent (SDA); wherein the amount of the structure directing agent (SDA) and the silica (SiO2) source provided is defined by a SDA:SiO2 molar ratio that ranges from 0.03 to 0.05;
d) providing a source of metal cations;
e) mixing the source of silica and alumina with the SDA and the source of metal cations in water to form a gel composition;
f) heating the gel composition to a crystallization temperature that is in the range of about 140° C. to about 180° C.;
g) maintaining the gel composition at the crystallization temperature for a time period that ranges from 9 hours to 24 hours;
h) allowing the gel to crystallize and precipitate; the gel composition forming a crystalline precipitate of the SSZ-13 zeolite and a mother liquid; and
i) separating the crystalline precipitate from the mother liquid;
wherein the formed SSZ-13 zeolite has a silica to alumina (SiO2:Al2O3) molar ratio (SAR) that is less than 16:1; a morphology that includes one or more of cubic, spheroidal, or rhombic particles; and a crystal size that is in the range of about 0.1 micrometer (μm) to 10 μm;

providing a source of at least one transition metal; and
subjecting the SSZ-13 zeolite and the source of the transition metal to an ion exchange, impregnation, or isomorphous substitution process;
wherein the at least one transition metal is substituted for the metal cations in the SSZ-13 zeolite, thereby forming the catalyst;
wherein the amount of the transition metal (TM) and aluminum present in the catalyst is further defined by a TM:Al molar ratio in the range of 0.5 to 1.0.