摘要:
A honeycomb structure having porous partition walls having a large number of pores, formed so as to produce a plurality of cells each extending between the two ends of the honeycomb structure, and plugged portions formed so as to plug the cells at either one end of the honeycomb structure or at the insides of the cells, wherein the honeycomb structure has the partition walls of a permeability of 7×10−12 to 4×10−8 m2. The honeycomb structure can provide a honeycomb catalyst structure which is superior in purification efficiency, is low in pressure loss and can be mounted even in a limited space.
摘要:
Partition walls are provided with small pores and large pores, a porosity of the partition walls is from 50 to 70%, a porosity of the large pores of the partition walls is 30% or larger, a ratio of a total volume of the small pores to a total volume of the large pores is 20% or larger, and in a graph showing a pore diameter distribution of the partition walls, the pore diameter at a maximum peak value of the large pores is from 20 to 200 μm, and the pore diameter at a maximum peak value of the small pores is from 0.1 to 8 μm. Furthermore, a value obtained by dividing a porosity value (%) of the large pores by a thickness value (μm) of the partition walls is 0.2 or larger in a honeycomb structure.
摘要:
There is provided a honeycomb filter wherein particles having an average particle diameter smaller that of the particles constituting partition walls are deposited at least in open pores formed by the particles constituting the partition walls and/or gaps between the particles in a surface layer portion of the partition walls on the exhaust gas inflow side, thereby forming a composite region. The average pore diameter of the partition walls is 5 to 40 μm, and the porosity of the partition wall is 35 to 75%. The particles to be deposited have an average particle diameter of 1 to 15 μm, and the height of the composite region is not more than 80 μm in the direction from the outermost contour line of the partition walls to the surface of the partition walls.
摘要:
A substrate with a surface-collection-layer comprising a honeycomb substrate having a porous partition wall that defines and forms cells, and a plurality of plugging portions, a surface-collection-layer being formed on a surface of the partition wall that forms the remaining cells, the thickness of the surface-collection-layer on the outlet-side open end being larger than the thickness of the surface-collection-layer in a center area of the substrate, the partition wall having predetermined thickness, porosity and pore size, the surface-collection-layer having predetermined thickness, porosity, and average pore size, and the substrate having predetermined cell density.
摘要:
In the plasma reaction vessel (1) of the invention, two or more laminate-structures (6) having ceramic formed bodies (3, 4) in which a plasma generating electrode (2) capable of generating plasma is formed in two-tape-form, and an electrically continuous film-like electrically conductive electrode (5) held between the two ceramic formed bodies (3, 4) are formed in such a manner as to form a plasma generating space (7) containing mutual laminate planes therein. Of the electrically conductive electrodes (5), adjacent ones are capable of having electric discharge produced therebetween so as to generate the plasma in the plasma generating space (7) and of generating uniform stabilized plasma at low electric power, it being possible to reduce a passage resistance to a gas passing therein.
摘要:
A particulate matter sensor (1) which may be used as an onboard particulate matter diagnostic sensor includes an insulating base (2) that has at least a pair of opposing plane surfaces, an electrode nucleus (3) that is formed on one of the pair of opposing plane surfaces of the base (2), and forms an electrode when a conductive substance adheres to the plane surface, and an electrode (4) that is disposed parallel to the electrode nucleus (3) and is provided on the other of the pair of opposing plane surfaces, or provided on a side surface of the base (2) that is adjacent to the pair of opposing plane surfaces, or provided inside the base (2).
摘要:
A honeycomb catalyst body includes: porous partition walls having a large number of pores and disposed to form a plurality of cells communicating between two end faces, plugged portions disposed to plug each of the cells on one of the end faces, and catalyst layers loaded in layers on an inner surface of the cells and an inner surface of the pores and containing a noble metal. Mass (Mc) of the noble metal contained in the catalyst layer loaded on the inner surface of the cells and mass (Mp) of the noble metal contained in the catalyst layer loaded on the inner surface of the pores satisfy the relation of (Mp)/(Mc)≧4. The honeycomb catalyst body is excellent in purification efficiency, has low pressure loss, and is mountable even in a limited space.
摘要:
An exhaust gas treating apparatus 1 includes: a case body 2 and a plasma producing means 3 capable of producing plasma inside the case body 2 and treats the substances to be treated contained in the exhaust gas by the plasma producing means 3. The plasma producing means 3 has one or more each of a pulse electrode 4 and a ground electrode 5 that are oppositely disposed in the case body 2 and has a pulse power source 6 capable of feeding a pulse current to the pulse electrode 4 by switching frequency and/or voltage for different values at predetermined time intervals. The substances to be treated contained in the exhaust gas can selectively be treated by switching frequency and/or voltage value for different values at predetermined time intervals so that plasma of a kind adequate for the substances to be treated contained in an exhaust gas is produced between the pulse electrode 4 and the ground electrode 5.
摘要:
A plasma generating electrode of the invention present includes at least a pair of electrodes 5, at least one electrode 5a of the pair of electrodes 5 including a plate-like ceramic body 2 as a dielectric and a conductive film 3 disposed inside the ceramic plate 2 and having a plurality of through-holes 4 formed through the conductive film 3 in its thickness direction, the through-holes having a cross-sectional shape including an arc shape along a plane perpendicular to the thickness direction. The plasma generating electrode can generate uniform and stable plasma at low power consumption.
摘要:
A plasma generating electrode 1 of the present invention includes two or more electrodes 2 disposed to face each other, and holding members 3 for holding electrodes 2 at a predetermined interval, and can generate plasma by applying voltage between electrodes 2. At least one of electrodes facing each other 2 has a plate-shaped ceramic body 6 serving as a dielectric body, and a conductive film 7 disposed inside the body 6, and the holding members 3 fix the opposite side end portions 5 (fixed end portions 5a) of electrodes facing each other 2 in the state of a cantilever in such a condition that electrodes 2 are held by holding members in the state of cantilevers of the different directions alternately at a predetermined interval as a whole. This relaxes the thermal stress and effectively prevents distortion and breakage of electrodes caused by to a temperature change.