Treatment of cold start engine exhaust
    88.
    发明授权
    Treatment of cold start engine exhaust 有权
    冷启动发动机排气处理

    公开(公告)号:US08580228B2

    公开(公告)日:2013-11-12

    申请号:US11961776

    申请日:2007-12-20

    摘要: 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 comprising (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 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.

    摘要翻译: 本发明涉及通过使废气流与分子筛的组合接触来减少废气流(例如来自内燃机)中的冷启动排放的方法,所述分子筛包括(1)小孔结晶分子筛或 具有不大于8元环的分子筛,其选自SSZ-13,SSZ-16,SSZ-36,SSZ-39,SSZ-50,SSZ-52和SSZ-73分子筛,并且具有摩尔比 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的至少10的比例 至(b)不同于所述第一四价元素或其混合物的三价元素的氧化物,五价元素,第二四价元素。