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US 12,330,134 B2Granted
Hydrocarbon adsorbent
AssigneeMitsui Mining & Smelting Co., Ltd.
InventorsMayuko Suwa, Hidekazu Goto
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AssigneeMitsui Mining & Smelting Co., Ltd.
InventorsMayuko Suwa, Hidekazu Goto
Estimating the term…
Provided are: a hydrocarbon adsorbent capable of adsorbing hydrocarbons, storing the adsorbed hydrocarbons up to a relatively high temperature, and desorbing the adsorbed and stored hydrocarbons at a relatively high temperature; an exhaust gas purifying catalyst composition using the same; an exhaust gas purifying catalyst; and a method for treating an exhaust gas. The hydrocarbon adsorbent comprises a zeolite having an MRT-type framework structure. The hydrocarbon adsorbent comprises a small-pore zeolite having a total desorption amount ZD1 of propylene desorbed at 50° C. or higher and lower than 300° C. being 3.5 mmol/g or less and a total desorption amount ZD2 of propylene desorbed at 300° C. or higher and 500° C. or lower being 0.5 mmol/g or more, per 1 g by mass of the small-pore zeolite, when adsorbing propylene at 50° C. and then heating from 50° C. to 500° C. under the condition of 10° C./min by a temperature-programmed desorption method.
A hydrocarbon adsorbent, comprising a zeolite having an MRT-type framework structure,
A hydrocarbon adsorbent, comprising a Cu-containing zeolite having a ratio (ZD2/ZD1) of a total desorption amount ZD2 of propylene desorbed at 300° C. or higher and 500° C. or lower to a total desorption amount ZD1 of propylene desorbed at 50° C. or higher and lower than 300° C., per 1 g by mass of the Cu-containing zeolite that contains copper, being 0.5 or more, when adsorbing propylene at 50° C. and then heating from 50° C. to 500° C. under the condition of 10° C./min by a temperature-programmed desorption method.
A hydrocarbon adsorbent, comprising a Cu-free zeolite having a ratio (ZD2/ZD1) of a total desorption amount ZD2 of propylene desorbed at 300° C. or higher and 500° C. or lower to a total desorption amount ZD1 of propylene desorbed at 50° C. or higher and lower than 300° C., per 1 g by mass of the Cu-free zeolite that contains no copper, being 0.3 or more, when adsorbing propylene at 50° C. and then heating from 50° C. to 500° C. under the condition of 10° C./min by a temperature-programmed desorption method.
Dependencies are inferred from the claim text.