Abstract:
PROBLEM TO BE SOLVED: To improve measuring precision of hydrocarbon concentration in a method measuring the hydrocarbon concentration of exhaust gas. SOLUTION: Part of exhaust gas is brought into contact with a sensor catalyst 14 selectively oxidizing combination of CO+H2 + alkene hydrocarbon. Thereafter, an oxidized part of the exhaust gas is brought into contact with a sensor 16 generating an output signal showing the concentration of aromatic and alkene hydrocarbon genus in the oxidized exhaust gas part. The output signal is analyzed, and thereby aromatic and alkene hydrocarbon concentration is determined. Thereafter, the total concentration of nonmethane-based hydrocarbon in the exhaust gas is determined.
Abstract:
PROBLEM TO BE SOLVED: To improve measuring precision of hydrocarbon concentration in a device for measuring concentration of hydrocarbon in a gas sample. SOLUTION: The first part of exhaust gas is brought into contact with a first sensor 14, and a first output signal showing concentration of a main genus to be oxidized of the first exhaust gas is generated. The second part 16 of the exhaust gas is brought into contact with a second sensor, and a second output signal showing combination concentration of CO+H2 + alkene genus in the second exhaust gas is generated. Next, concentration of aromatic and alkene hydrocarbon genus in the exhaust gas is determined by comparing the first output signal and the second output signal. Thereafter, the concentration of the aromatic and alkene hydrocarbon genus is analyzed and the total concentration of a non-methane-based hydrocarbon genus is determined.
Abstract:
A porous ceramic honeycomb filter manufactured from an oxide-based ceramic material having a pore size distribution with d1 7.0 microns. Preferably, the oxide-based material is cordierite or aluminum titanate. Alternatively, the filter contains a cordierite-containing ceramic body with a narrow pore size distribution with db 1.00, wherein db = (d90 - d10) / d50. Also disclosed is a batch mixture, method and honeycomb green body made from mixture of inorganic source materials selected from the group of magnesia sources, alumina sources, and silica sources, and a pore former having a narrow particle size distribution with dps 0.90, wherein dps = {(dp90-dp10)/dp50}. The pore former is preferably selected from a group consisting of canna starch, sago palm starch, green mung bean starch, and single-mode potato starch.
Abstract:
Disclosed are ceramic honeycomb articles which are composed predominately of a crystalline phase cordierite composition. The porous cordierite ceramic honeycomb articles has a plurality of cell channels and intersecting porous walls and possess a microstructure characterized by a pore size distribution wherein greater than or equal to 75% of the pore size distribution of the porosity of the porous walls, by volume, have a pore diameter (dv) wherein dv v v90 -7/°C from 25°C to 800°C. The articles exhibits high filtration efficiency coupled with low pressure drop across the filter. Additionally, high porosity articles having porosity greater than or equal to 40% and low surface roughness of Ra
Abstract translation:公开了主要由结晶相堇青石组合物组成的陶瓷蜂窝体制品。 多孔堇青石陶瓷蜂窝体制品具有多个孔道和相交的多孔壁,并具有特征在于孔径分布的微观结构,其中多孔壁的孔隙率的孔径分布大于或等于75% 具有从25℃至800℃的dv v v 90 -7 /℃的孔径(dv)。 这些物品具有高过滤效率以及过滤器上的低压降。 此外,描述了具有大于或等于40%的孔隙率和低的表面粗糙度Ra <4.0μm的高孔隙率制品。 另外,公开了一种陶瓷蜂窝制品的制造方法,其中细滑石,二氧化硅细粉源和细孔成型剂。
Abstract:
Porous ceramic honeycomb bodies and methods of making them, wherein the ceramic body has a total porosity (%P) defined by a median pore size (d 50 ) greater than or equal to 10 microns; a pore size distribution d-factor less than 0.8, wherein d-factor = (d 50 -d 10 )/d 50 , and a submicron pore fraction characterized by less than 5% of the total porosity being comprised of pores having a pore diameter less than 1.0 micron.
Abstract translation:多孔陶瓷蜂窝体及其制造方法,其中所述陶瓷体具有大于或等于10微米的中值孔径(d≤50)定义的总孔隙率(%P); 孔径分布d因子小于0.8,其中d因子=(d≤50-10 i> 10)/ d 50,和 亚微米孔分数的特征在于总孔隙率小于5%的孔径由孔径小于1.0微米的孔组成。
Abstract:
Composite cordierite honeycomb structures especially suitable for diesel exhaust filtration applications comprise a non-oxide polycrystalline phase constituting 10-70% by weight, with the remainder of the ceramic material constituting a cordierite phase, the non-oxide polycrystalline phase being selected from the group consisting of carbides, nitrides, and borides. Preferably the non-oxide phase is either polycrystalline silicon carbide or polycrystalline silicon nitride and has a particle aspect ratio of less than 3. Inventive ceramic bodies are porous with an open porosity of at least 30%, preferably between 40% and 60%, and a median pore size of at least 5 micrometers, more preferably greater than 8 micrometers and less than 12 micrometers.
Abstract:
Composite cordierite honeycomb structures especially suitable for diesel exhaust filtration applications comprise a non-oxide polycrystalline phase constituting 10-70% by weight, with the remainder of the ceramic material constituting a cordierite phase, the non-oxide polycrystalline phase being selected from the group consisting of carbides, nitrides, and borides. Preferably the non-oxide phase is either polycrystalline silicon carbide or polycrystalline silicon nitride and has a particle aspect ratio of less than 3. Inventive ceramic bodies are porous with an open porosity of at least 30%, preferably between 40% and 60%, and a median pore size of at least 5 micrometers, more preferably greater than 8 micrometers and less than 12 micrometers.
Abstract:
Un dispositivo para alterar un material de abastecimiento, el dispositivo que esta hecho de una estructura para pasaje de un material de abastecimiento; la estructura puede ser una estructura unicuerpo extruida, o una estructura anidada; la estructura tiene una seccion interna y una externa, y un eje longitudinal, y las paredes que definen dos series de pasajes con los extremos abiertos que se extienden a lo largo del eje longitudinal; las dos series de pasajes tienen diferentes formas o dimensiones de seccion transversal con respecto a cada uno, cada pasaje de una serie se encuentra adyacente a por lo menos un pasaje de la otra serie, o al exterior de la estructura; cuando la estructura es anidada, por lo menos una serie de canales tienen una seccion transversal en la forma de arcos truncados; un método para hacer la estructura unicuerpo involucra extruir una mezcla de materia prima plastificada a través de un dado, seguido por tratamiento a calor; un método para alterar un material de abastecimiento que involucra pasar un material de abastecimiento en el dispositivo a través de una serie de pasajes para provocar una alteracion al material de abastecimiento, y después pasar la corriente de salida en y a través de la otra serie de canales hacia el exterior del dispositivo.
Abstract:
A catalyst for the selective catalytic reduction of a nitrogen oxide, comprising a first component selected from oxides of a transition metal other than the metal contained in the second component, or a mixture or combination thereof, a second component selected from cerium oxides, cerium-zirconium composite oxides, and cerium-titanium composite oxides, and combinations thereof. The catalyst can be utilized in pellet form; or coated onto a porous monolithic ceramic to form a honeycomb-shaped catalyst. Provided in the present invention is also the process for making said catalyst, which includes: preparing the first component from the precursor of the first component; preparing the second component; and loading the first component onto the second component.