Activated carbon fiber sheet for motor vehicle canister

Patent metadata

Field	Value
Publication number	US-12208367-B2
Application number	US-202217667209-A
Country	US
Kind code	B2
Filing date	Feb 8, 2022
Priority date	Aug 21, 2019
Publication date	Jan 28, 2025
Grant date	Jan 28, 2025

Abstract

A problem to be solved by the present invention is to provide a new form of adsorbent suitable for a motor vehicle canister. An activated carbon fiber sheet satisfies one or two or more of conditions for indices, such as a specific surface area, a pore volume of pores having a given pore diameter, and a sheet density. An embodiment, for example, may have: a specific surface area ranging from 1400 to 2300 m 2 /g; a pore volume ranging from 0.20 to 0.70 cm 3 /g for pores having pore diameters of more than 0.7 nm and 2.0 nm or less; an abundance ratio R 0.7/2.0 , which is a ratio of a pore volume of micropores having pore diameters of 0.7 nm or less occupied in a pore volume of micropores having pore diameters of 2.0 nm or less, ranging from 5% to less than 25%, and a sheet density ranging from 0.030 to 0.200 g/cm 3 .

First claim

What is claimed is:

1. An activated carbon fiber sheet, comprising:
a specific surface area ranging from 1400 m 2 /g to 2300 m 2 /g;
a pore volume V 0.7-2.0 that is a volume for pores having pore diameters larger than 0.7 nm and equal to or smaller than 2.0 nm, ranging 0.20 cm 3 /g to 0.70 cm 3 /g;
an abundance ratio R 0.7/2.0 that is a ratio of a pore volume of micropores having pore diameters of 0.7 nm or less occupied in a pore volume of micropores having pore diameters of 2.0 nm or less, ranging from 13% to less than 25%, and
a sheet density ranging from 0.020 g/cm 3 to 0.200 g/cm 3 .

2. The activated carbon fiber sheet according to claim 1 , wherein a total pore volume of the activated carbon fiber sheet ranges from 0.60 to 1.20 cm 3 /g.

3. The activated carbon fiber sheet according to claim 1 , wherein the activated carbon fiber sheet is a carbonized product of cellulosic fiber.

4. A motor vehicle canister, comprising: the activated carbon fiber sheet according to claim 1 .

5. The motor vehicle canister according to claim 4 , wherein a total pore volume of the activated carbon fiber sheet ranges from 0.60 to 1.20 cm 3 /g.

6. The motor vehicle canister according to claim 4 , wherein the activated carbon fiber sheet is a carbonized product of cellulosic fiber.

7. The activated carbon fiber sheet according to claim 1 , wherein the activated carbon fiber sheet is used for a motor vehicle canister.

8. The activated carbon fiber sheet according to claim 1 , wherein the activated carbon fiber sheet is stored in a chamber of a motor vehicle canister.

9. The activated carbon fiber sheet according to claim 1 , wherein the abundance ratio R 0.7/2.0 ranges from 15% to less than 25%.

Assignees

• Jujo Paper Co Ltd

Inventors

• Imai Daisuke
• Watanabe Yoshihide
• Takata Yuu
• Ozawa Shunsuke
• Yoshida Chie

Classifications

• F02M2200/9046

  Multi-layered materials · CPC title

• F02M25/0854 Primary

  Details of the absorption canister · CPC title

• D10B2505/12

  Vehicles (D10B2505/08 takes precedence) · CPC title

• D10B2401/10

  porous · CPC title

• D06C7/04

  Carbonising or oxidising (processes comprising combined chemical and mechanical treatment D06M) · CPC title