Honeycomb adsorbent, method of manufacturing the honeycomb adsorbent and canister
View Patent ↗A cylindrical column-shaped honeycomb adsorbent has a plurality of cell passages extending along an axial direction of the honeycomb adsorbent. The plurality of cell passages are configured so that a pitch of adjacent cell passages is within a range of 1.5 mm˜1.8 mm, and so that a thickness of a wall between the cell passages is within a range of 0.45 mm˜0.60 mm. With this configuration, the honeycomb adsorbent exhibits BWC (Butane Working Capacity) of 6.5 g/dL or greater. By mixing fibrous meltable core melting away during baking, the honeycomb adsorbent has macropores configured to have a volume of 0.15 mL/g˜0.35 mL/g with respect to an overall weight of the honeycomb adsorbent and metal oxide particles having a proportion of weight of 150˜250% with respect to the activated carbon.
1. A honeycomb adsorbent having a cylindrical column shape, the honeycomb adsorbent formed by molding and baking powdery activated carbon together with binder and installed in a closest chamber to a drain port of a canister having a plurality of chambers, the honeycomb adsorbent comprising:
a plurality of cell passages extending along an axial direction of the honeycomb adsorbent;
macropores formed with fibrous meltable core melting away during the baking, the macropores being configured to have a volume of 0.15 mL/g˜0.35 mL/g with respect to an overall weight of the honeycomb adsorbent; and
metal oxide particles having a proportion of weight of 150˜250% with respect to the activated carbon, and
the plurality of cell passages being configured so that a pitch of adjacent cell passages is within a range of 1.5 mm˜1.8 mm, and so that a thickness of a wall between the cell passages is within a range of 0.45 mm˜0.60 mm, and
the honeycomb adsorbent being configured to exhibit BWC (Butane Working Capacity) of 6.5 g/dL or greater.
2. The honeycomb adsorbent as claimed in claim 1 , wherein:
an occupation ratio that is determined by outside dimensions of the honeycomb adsorbent and dimensions of the cell passages is at least 50%.
3. The honeycomb adsorbent as claimed in claim 1 , wherein:
a shape in a cross-section of the cell passage is any one of a hexagon, a quadrangle, a triangle and a circle.
4. The honeycomb adsorbent as claimed in claim 3 , wherein:
the shape in the cross-section of the cell passage is the hexagon.
5. The honeycomb adsorbent as claimed in claim 1 , wherein:
the metal oxide particles are iron oxide particles.
6. A canister having the honeycomb adsorbent as claimed in claim 1 .
7. The canister as claimed in claim 6 , further comprising:
at least an additional adsorbent.
8. A method of manufacturing a honeycomb adsorbent for a canister, comprising:
making mixture as mold material by adding, to powdery activated carbon, metal oxide particles having a proportion of weight of 150˜250% with respect to the activated carbon, meltable core made of fiber whose specific gravity is 1.1 g/cm 3 ˜1.3 g/cm 3 and having a proportion of weight of 40˜100% with respect to the activated carbon, the meltable core melting away during baking, and binder;
extruding the mold material into a cylindrical column-shaped intermediate mold body having therein a plurality of honeycomb cell passages, the plurality of cell passages being configured so that a pitch of adjacent cell passages is within a range of 1.5 mm˜1.8 mm and so that a thickness of a wall between the cell passages is within a range of 0.45 mm˜0.60 mm after the baking; and
baking the intermediate mold body, the baked intermediate mold body of the honeycomb adsorbent exhibiting BWC (Butane Working Capacity) of 6.5 g/dL or greater.
9. The method of manufacturing the honeycomb adsorbent for the canister as claimed in claim 8 , wherein:
the fiber forming the meltable core is polyamide resin fiber or polyester resin fiber.
10. The method of manufacturing the honeycomb adsorbent for the canister as claimed in claim 8 , wherein:
the fiber forming the meltable core has a diameter of 10 μm and a length of 0.5 mm.