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    • 2. 发明申请
    • TREATMENT OF COLD START ENGINE EXHAUST
    • 冷起动发动机排气的处理
    • WO2008083126A3
    • 2008-10-30
    • PCT/US2007088752
    • 2007-12-22
    • CHEVRON USA INCZONES STACEY IWILLIAMS CABRAL MRUFAEL TECLE SBURTON ALLEN W
    • ZONES STACEY IWILLIAMS CABRAL MRUFAEL TECLE SBURTON ALLEN W
    • B01D53/02
    • B01D53/945B01D53/04B01D53/9486B01D2253/104B01D2253/108B01D2255/102B01D2255/1021B01D2255/1023B01D2255/50B01D2259/4143B01J29/70B01J29/7007B01J29/80Y02A50/2324Y02C20/20Y02T10/22
    • The present invention relates to a process for reducing cold start emissions in an exhaust gas stream (such as from an internal combustion engine) by contacting the exhaust stream with a combination of molecular sieves (1) a small pore crystalline molecular sieve or mixture of molecular sieves having pores no larger than 8 membered rings selected from the group consisting of SSZ-13, SSZ-16, SSZ-36, SSZ-39, SSZ-50, SSZ-52 and SSZ-73 molecular sieve and having a mole ratio of at least 10 of (a) an oxide of a first tetravalent element to (b) an oxide of a trivalent element, pentavalent element, second tetravalent element which is different from said first tetravalent element or mixture thereof and (2) a medium-large pore crystalline molecular sieve having pores at least as large as 10 membered rings selected from the group consisting of SSZ-26, SSZ-33, SSZ-64, zeolite Beta, CIT-1, CIT-6 and ITQ-4 and having a mole ratio of at least 10 of (a) an oxide of a first tetravalent element to (b) an oxide of a trivalent element, pentavalent element, second tetravalent element which is different from said first tetravalent element or mixture thereof.
    • 本发明涉及通过使排气流与分子筛(1)的结合使小排气结晶分子筛或分子筛的混合物与排气流(例如来自内燃机)相结合来减少冷启动排放的方法 具有选自SSZ-13,SSZ-16,SSZ-36,SSZ-39,SSZ-50,SSZ-52和SSZ-73分子筛的不大于8元环的孔的筛子,其摩尔比为 至少10个(a)第一四价元素的氧化物,(b)三价元素的氧化物,不同于所述第一四价元素或其混合物的五价元素,第二四价元素和(2)中等大小 孔结晶分子筛,其孔至少与选自SSZ-26,SSZ-33,SSZ-64,β沸石,CIT-1,CIT-6和ITQ-4组成的组中的10元环一样大,并具有摩尔 (a)第一四价元素的氧化物与(b)的至少10% 三价元素的氧化物,不同于所述第一四价元素或其混合物的五价元素,第二四价元素。