Honeycomb filter and urea SCR device
AssigneeIbiden Co., Ltd.
InventorsKazutake Ogyu, Toyoki Ogasawara
Life of this patent
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Abstract
A honeycomb filter includes a honeycomb structure and a zeolite. The honeycomb structure includes cell walls having a porosity of about 55% to about 65% and extending along a longitudinal direction of the honeycomb structure to define cells between the cell walls. Each of the cells is sealed at either end of the cells. The zeolite is supported on the cell walls of the honeycomb structure. An amount of the zeolite supported on the cell walls is from about 80 g/L to about 150 g/L. A thermal conductivity of the cell walls supporting the zeolite is about 3 W/mK or more.
Claims40
A honeycomb filter comprising:
- a honeycomb structure comprising:
- silicon carbide;
- and
- cell walls having a porosity of about 55% to about 65% and extending along a longitudinal direction of the honeycomb structure to define cells between the cell walls, each of the cells being sealed at either end of the cells;
- and
- a zeolite supported on the cell walls of the honeycomb structure, an amount of the zeolite supported on the cell walls being from about 80 g/L to about 150 g/L, a thermal conductivity of a combination of the cell walls and the zeolite supported therein being about 3 W/mK or more,
- wherein the honeycomb filter has both a function of a catalyst carrier of a urea SCR device and a function of a DPF.
A urea SCR device comprising
- a honeycomb filter placed in a casing, the honeycomb filter comprising:
- a honeycomb structure comprising cell walls having a porosity of about 55% to about 65% and extending along a longitudinal direction of the honeycomb structure to define cells between the cell walls, each of the cells being sealed at either end of the cells;
- and
- a zeolite supported on the cell walls of the honeycomb structure, an amount of the zeolite supported on the cell walls being from about 80 g/L to about 150 g/L, a thermal conductivity of a combination of the cell walls and the zeolite supported therein being about 3 W/mK or more,
- wherein the honeycomb filter has both a function of a catalyst carrier of a urea SCR device and a function of a DPF.
A method of manufacturing a urea SCR device, said method comprising:
- forming a honeycomb filter comprising:
- a honeycomb structure comprising cell walls having a porosity of about 55% to about 65% and extending along a longitudinal direction of the honeycomb structure to define cells between the cell walls, each of the cells being sealed at either end of the cells;
- and
- a zeolite supported on the cell walls of the honeycomb structure, an amount of the zeolite supported on the cell walls being from about 80 g/L to about 150 g/L, a thermal conductivity of a combination of the cell walls and the zeolite supported therein being about 3 W/mK or more,
- wherein the honeycomb filter has both a function of a catalyst carrier of a urea SCR device and a function of a DPF;
- and
- placing the honeycomb filter in a casing,
- wherein the zeolite is supported on the cell walls by dipping the honeycomb structure into a zeolite slurry, drying the dipped honeycomb structure, firing the dried honeycomb structure, and repeating the dipping, drying and firing until the amount of the zeolite supported on the cell walls is from about 80 g/L to about 150 g/L.
Dependencies are inferred from the claim text.