Low pressure drop coated diesel exhaust filter
    3.
    发明申请
    Low pressure drop coated diesel exhaust filter 审中-公开
    低压降涂层柴油机排气过滤器

    公开(公告)号:US20070140928A1

    公开(公告)日:2007-06-21

    申请号:US11638899

    申请日:2006-12-14

    IPC分类号: B01D50/00

    摘要: A coated diesel exhaust filter is provided that applies a relatively low pressure drop across the exhaust system despite the buildup of soot deposits. The filter includes a porous ceramic structure having an inlet end, an outlet end, and a plurality of gas inlet and gas outlet channels disposed between the inlet and outlet ends, the channels being separated by porous ceramic walls. A catalyst is distributed at least partly within the porous ceramic walls of the structure, and is distributed at a higher concentration within portions of the ceramic walls adjacent to the outlet surfaces than within portions of the ceramic walls adjacent the inlet surfaces. Both the inlet and outlet surfaces are substantially free of the catalyst in order to maintain a gas-conducting porosity in these surfaces. The resulting filter effectively treats nitrogen oxides, carbon monoxide and unburned hydrocarbons present in the exhaust gas stream while advantageously imposing a relatively low pressure drop across the exhaust system even when soot deposits accumulate on the inlet surfaces of the ceramic walls.

    摘要翻译: 提供了一种涂覆的柴油机废气过滤器,尽管积聚了烟灰沉积物,但它们在排气系统上施加相对较低的压降。 过滤器包括多孔陶瓷结构,其具有入口端,出口端以及设置在入口端和出口端之间的多个气体入口和气体出口通道,通道被多孔陶瓷壁隔开。 催化剂至少部分地分布在结构的多孔陶瓷壁内,并且在与出口表面相邻的陶瓷壁的部分内分布在比邻近入口表面的陶瓷壁的部分内更高的浓度。 入口表面和出口表面基本上不含催化剂,以便在这些表面中保持导气孔隙率。 所得到的过滤器有效地处理废气流中存在的氮氧化物,一氧化碳和未燃烃,同时即使当烟尘沉积物积聚在陶瓷壁的入口表面上时,也有利地施加相对较低的压降。

    Diesel particulate filter with filleted corners
    4.
    发明申请
    Diesel particulate filter with filleted corners 审中-公开
    柴油颗粒过滤器带圆角

    公开(公告)号:US20050274097A1

    公开(公告)日:2005-12-15

    申请号:US11152122

    申请日:2005-06-13

    IPC分类号: B01D46/00 B01D46/24

    摘要: A wall-flow filter having a honeycomb body being composed of a plurality of end-plugged cell channels defined by an array of interconnecting and intersecting porous walls, the cell channels extending between end faces of the honeycomb body, the cell channels having fillets at each corner. An extrusion die for making the honeycomb body is described.

    摘要翻译: 一种壁流式过滤器,其具有蜂窝体,该蜂窝体由多个由相互连接且相交的多孔壁阵列限定的端塞孔单元通道组成,所述蜂窝通道在蜂窝体的端面之间延伸,所述单元通道在每个孔处具有圆角 角。 对用于制造蜂窝体的挤出模具进行描述。