This catalyst system simultaneously removes ammonia and enhances net NOx conversion by placing an NH 3 -SCR catalyst formulation downstream of a lean NOx trap. By doing so, the NH 3 -SCR catalyst adsorbs the ammonia from the upstream lean NOx trap generated during the rich pulses. The stored ammonia then reacts with the NOx emitted from the upstream lean NOx trap—enhancing the net NOx conversion rate significantly, while depleting the stored ammonia. By combining the lean NOx trap with the NH 3 -SCR catalyst, the system allows for the reduction or elimination of NH 3 and NOx slip, reduction in NOx spikes and thus an improved net NOx conversion during lean and rich operation.

Catalyst system for the reduction of NOx and NH3 emissions

A turbocharger variable geometry turbine of the type which includes nozzle vanes displaceable across the turbine inlet flow path into slots. The vanes have cut-outs which reduce the vane cord and permit peak turbine efficiency over a range of geometries.

Variable geometry turbine

A ceramic honeycomb filter (10) comprising a ceramic honeycomb structure (1) having porous partition walls (3) defining a plurality of flow paths (4) for flowing an exhaust gas through the porous partition walls (3) to remove particulates from the exhaust gas, wherein one end of each flow path (4) is provided with a sealer (5), such that the sealers of the flow paths (4) in an inlet and an outlet of the ceramic honeycomb structure are arranged in a desired pattern; wherein the partition walls (3) have thickness of 0.1-0.5mm and a porosity of 50-80%; wherein the porosity of the sealers (5) is larger than that of the partition walls (3); and wherein the depth of the sealers (5) is 3-15mm.

Ceramic honeycomb filter

Thermoplastic bicomponent binder fiber can be combined with other media, fibers and other filtration components to form a thermally bonded filtration media. The filtration media can be used in filter units. Such filter units can be placed in the stream of a mobile fluid and can remove a particular load from the mobile stream. The unique combination of media fiber, bicomponent binder fiber and other filtration additives and components provide a filtration media having unique properties in filtration applications.

Filter medium and structure

The ceramic honeycomb structural body comprises a pillar-shaped honeycomb structural porous ceramic member formed by arranging a plurality of through holes as a gas path side by side through partition walls or a combination thereof, in which the ceramic honeycomb structural body is a sintered body having a pore structure in which one or more peaks (the maximum value) exist in each region of a first pore group of pores having a pore size of about 005 μm to about 150 μm and of a second pore group of pores having a pore size of about 0006 μm to about 001 μm

Ceramic honeycomb structural body

A filter, system and method is provided for filtering nanoparticles in a hot gas, namely particles about 200° C. and further particularly >about 450° C. including diesel exhaust. The filter includes filter media material composed of fibrous filter media having a plurality of fibers and granular filter media having a plurality of granules extending from the surfaces of the fibers. The filter is characterized by a permeability >about 3×10 −12 m 2 and an inertial resistance coefficient <about 1×10 6 m −1 . The filter captures particles in the Most Penetrating Region (MPR). A filter system includes a nanoparticle filter in series with a diesel exhaust treatment element.

High temperature nanofilter, system and method

A method for making high temperature filter media is provided by melt-spinning a plurality of fibers of preceramic thermoplastic polymer to form a nonwoven textile web of the fibers, curing and cross-linking the thermoplastic polymer to a thermoset polymer, and thermally decomposing the thermoset polymer to ceramic. Between the melt-spinning step and the curing step, the web is formed to a filter pre-form in a green state while still pliable and malleable. The filter pre-form is cured without re-melting the thermoplastic polymer and without destroying morphology.

Melt-spun ceramic fiber filter and method

An exhaust aftertreatment filter (40) is provided with localized and efficient heating for regeneration. Electrical and/or thermal conductors are wound with filter media sheets into a filter roll (46) and /or conductors are provided at axial ends of the filter roll and/or microwave radiation is used for localized hot zone heating. Regeneration is provided at lateral slices of the filter roll lying in a plane extending transversely and radially relative to the filter roll axis (45).

Regenerable filter with localized and efficient heating

Modified exhaust aftertreatment filters for filtering engine exhaust are provided as are methods of design and manufacturing modified exhaust aftertreatment filters. The modified filters are subject to reduced back pressure and reduced thermal gradients experienced during regeneration as compared to unmodified filters. The modified filters include flow-through channels obtained by unplugging channels which normally are plugged in an unmodified filter.

Tuning Particulate Filter Performance Through Selective Plugging and Use of Multiple Particulate Filters to Reduce Emissions and Improve Thermal Robustness

Verfahren
zur Herstellung von Hochtemperaturfiltermaterialien, umfassend das
Schmelzspinnen einer Mehrzahl von Fasern eines vorkeramischen thermoplastischen
Polymers, um eine nicht-gewebte Gewebebahn aus den Fasern zu bilden,
Harten
und Quervernetzen des thermoplastischen Polymers in ein warmegehartetes Polymer
und thermisches Zersetzen des warmegeharteten Polymers
in Keramik.

Schmelzgesponnener Keramikfaserfilter und Verfahren

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