发明名称 |
Hydrocarbon trap with increased zeolite loading and improved adsorption capacity |
摘要 |
A hydrocarbon trap is provided for reducing cold-start hydrocarbon emissions. The trap comprises a monolithic flow-through substrate having a porosity of at least 60% and including a zeolite loading of at least 4 g/in3 in or on its walls. A separate coating of a three-way catalyst is provided over the zeolite coating. The trap may further include an oxygen storage material. The hydrocarbon trap may be positioned in the exhaust gas system of a vehicle such that unburnt hydrocarbons are adsorbed on the trap and stored until the monolith reaches a sufficient temperature for catalyst activation. |
申请公布号 |
US9463447(B2) |
申请公布日期 |
2016.10.11 |
申请号 |
US201414167306 |
申请日期 |
2014.01.29 |
申请人 |
Ford Global Technologies, LLC |
发明人 |
Cavataio Giovanni;Lupescu Jason Aaron;Sharma Manish |
分类号 |
B01D53/94;B01J29/80;B01J37/02;B01J29/14;B01J29/24;B01J29/46;B01J29/63;B01J29/68;B01J29/76;B01J35/04 |
主分类号 |
B01D53/94 |
代理机构 |
Alleman Hall McCoy Russell & Tuttle LLP |
代理人 |
Porcari Damian;Alleman Hall McCoy Russell & Tuttle LLP |
主权项 |
1. A method for reducing cold start hydrocarbon emissions from a vehicle engine comprising:
providing a hydrocarbon trap positioned in an exhaust passage of a vehicle, said hydrocarbon trap comprising a monolithic wall-flow substrate having a porosity of at least 60% and including a loading of at least 4 g/in3 zeolite wherein at least 2 g/in3 of the zeolite penetrates into porous walls of the monolithic wall-flow substrate, wherein the hydrocarbon trap further comprises a three-way catalyst over said zeolite, with a loading of about 2 g/in3 of said three-way catalyst; and passing exhaust gases through said trap at a gas space velocity of about 30,000/hr; wherein said trap adsorbs from about 50 to 90% of unburned hydrocarbons in said exhaust gases at a temperature between about −40 and 200° C. |
地址 |
Dearborn MI US |