Ngk Insulators, Inc.

Nsk Insulators, Ltd.

Yukinari Shibagaki

Naomi Noda

Akira Takahashi

Hiroshige Mizuno

Katsumi Saiki

Yoshimasa Kondo

Daichi Tanaka

Yoshiyuki Kasai

Takeyuki Ishii

Takashi Harada

Junichi Suzuki

Takuya Hiramatsu

Akito Higuchi

Takeyuki Isii

A method for controlling a reductant generation device, the reductant generation deviceincluding: a sprayercapable of spraying a reductant precursor; and a heatercomprising a ceramic substrate, the heaterbeing arranged on a downstream side of the sprayerand capable of heating the reductant precursorto generate a reductant. The method includes: a permeation step of spraying the reductant precursorfrom the sprayerand permeating the ceramic substratewith the reductant precursorwhen the heater is not heated; and after the permeation step, a heating step A of heating the reductant precursorby the heaterand generating the reductantwhile spraying the reductant precursorfrom the sprayer

Control method for reductant generation device, exhaust purification method, reductant generation system, and exhaust purification system

A reductant injecting device includes: a honeycomb structure comprising: a pillar shaped honeycomb structure portion having a partition wall that defines a plurality of cells each extending from a fluid inflow end face to a fluid outflow end face; and at least one pair of electrode portions arranged on a side surface of the honeycomb structure portion; an inner cylinder being configured to house the honeycomb structure; a urea sprayer arranged at one end of the inner cylinder; and an outer cylinder arranged on an outer peripheral side of the inner cylinder, the outer cylinder being spaced apart from the inner cylinder. A flow path through which the carrier gas passes is formed between the inner cylinder and the outer cylinder.

Reductant injecting device, exhaust gas processing device and exhaust gas processing method

A tubular member for an exhaust gas treatment device according to at least one embodiment of the present invention includes: a tubular main body made of a metal; and an insulating layer formed at least on an inner peripheral surface of the tubular main body. The insulating layer contains glass, the glass contains barium, and the glass has a content of barium of 5 mol % or more.

Tubular member for exhaust gas treatment device and exhaust gas treatment device using the tubular member, and method of manufacturing tubular member for exhaust gas treatment device

A tubular member for an exhaust gas treatment device according to at least one embodiment of the present invention includes: a tubular main body made of a metal; and an insulating layer formed at least on an inner peripheral surface of the tubular main body. The insulating layer contains glass containing a crystalline substance, and the glass contains silicon, boron, and magnesium.

A reductant injecting device, including: a honeycomb structure including: a pillar shaped honeycomb structure portion having partition wall that defines a plurality of cells each extending from a fluid inflow end face to a fluid outflow end face; and at least one pair of electrode portions arranged on a side surface of the honeycomb structure portion; an outer cylinder having an inlet side end portion and an outlet side end portion, the inlet side end portion comprising a carrier gas introduction port being configured to introduce a carrier gas, the outlet side end portion comprising an injection port being configured to inject ammonia; a urea sprayer arranged at one end of the outer cylinder; and a spray direction switcher configured to be able to switch a spray direction of the aqueous urea solution.

A tubular member for an exhaust gas treatment device according to at least one embodiment of the present invention includes: a tubular main body made of a metal; and an insulating layer formed at least on an inner peripheral surface of the tubular main body. The insulating layer contains glass, and the glass has a content of an alkali metal element of 1,000 ppm or less.

A reductant injecting device includes: a honeycomb structure comprising: a pillar shaped honeycomb structure portion having a partition wall that defines a plurality of cells each extending from a fluid inflow end face to a fluid outflow end face; and at least one pair of electrode portions arranged on a side surface of the honeycomb structure portion; an outer cylinder being configured to house the honeycomb structure, the outer cylinder having a carrier gas introduction port on the fluid inflow end face side; a urea sprayer arranged at one end of the outer cylinder; a carrier gas introduction cylinder provided at the carrier gas introduction port of the outer cylinder; and a carrier gas flow rate amplifier provided in the carrier gas introduction cylinder.

A honeycomb structure including a honeycomb portion having porous partition walls extending from an inflow end face to an outflow end face, an outermost peripheral wall, and a pair of electrode layers on a side surface of the honeycomb portion. Each electrode layer extends in a direction of the cells. One electrode layer is disposed on a side opposite to the other electrode layer across a center of the honeycomb portion in a cross section orthogonal to the extending direction of the cells. The honeycomb structure portion includes first cells opened on the inflow side and plugged on the outflow side, and second cells opened on the outflow side and plugged on the inflow side. A middle of each length of the pair of electrode layers is closer to the outflow side than a middle position of a length of the honeycomb portion in the extending direction of the cells.

Honeycomb structure

A honeycomb structure molding apparatushaving a spinneretprovided with a back pore partfor introducing a molding material and a slit partfor extruding the molding material, and a press platefor fixing the spinneret, in which the spinneretcomprises an inner side partand an outer peripheral part, the inner side partis protruded to the downstream side to form a level difference partbetween the inner side partand the outer peripheral part, the press plateis opened opposing the inner side partof the spinneretand presses the downstream side of the outer peripheral partof the spinneretthrough a gap part, and there is provided a gap adjusting meanscapable of changing width of the gap of the gap part

Apparatus for molding honeycomb structure and molding method

Apparatus for molding a honeycomb structure

A ceramic honeycomb structure has an open frontal area of 50% to 85%, a porosity of 0.1% to 10%, and a proportion of the volume of pores of 1 &mgr;m or larger in diameter, in total pore volume, of 20% or more; a regenerative thermal oxidizer using the ceramic honeycomb structure. The ceramic honeycomb structure has a small porosity and, therefore, has a sufficient heat accumulation capacity and hardly causes floating by gas pressure; has controlled pore diameters and, therefore, hardly shows adsorption of VOC or the like, or rupture; and has controlled contraction and, therefore, has a large GSA.

Ceramic honeycomb structure and process for production thereof

The method includes the steps of preparing a die main body; performing batch supply hole machining with respect to one principal plane of the die main body to form batch supply holes; using a cutting apparatus to perform slit machining with respect to the other principal plane of the die main body to form slits; without removing the cutting apparatus from the die main body, continuously performing lateral hole machining to form the batch bold portions, which are arranged at least at intersecting portions in the die main body between the batch supply holes and the slits and are arranged corresponding to the slits; and there after removing the cutting apparatus from the die main body to thereby form an integral die. Alternatively, the above slit machining and continuously performing lacteral hole machining steps can be performed first and followed by performing the batch supply hole machining step.

Method of manufacturing die

A catalyst for exhaust gas purification includes (1) a monolithic carrier having passages and (2) palladium-loaded alumina obtained by immersing alumina in a palladium solution and then firing the resulting alumina and loaded on the monolithic carrier as a catalyst layer. In the catalyst, the catalyst layer loaded on the partition walls of the passages of the monolithic carrier has a thickness of 5 to 100 &mgr;m and the palladium/alumina (Pd/Al O ) weight ratio in the catalyst layer is 0.03 to 0.30. This catalyst is a Pd-only catalyst improved in hydrocarbon purifiability during the cold start of engine.

Catalyst for exhaust gas purification and exhaust gas purification system using the same

System for exhaust gas purification

A catalyst for exhaust gas purification is capable of purifying the hydrocarbons, nitrogen oxides and carbon monoxide present in the exhaust gas discharged from an internal combustion engine. The catalyst has a monolithic carrier and a catalyst layer containing Pd, Ba and a heat-resistant inorganic oxide, formed on the carrier. The amount of Pd supported on monolithic carrier is 100-300 g per ft of monolithic carrier (3.53&times;10 to 1.06&times;10 g per cc of monolithic carrier), the amount of Ba supported on monolithic carrier is 0.010-0.060 g per cc of monolithic carrier in terms of BaO, and the weight ratio of Pd and Ba as expressed as BaO is 1:2 to 1:10. This catalyst for exhaust gas purification is superior particularly in hydrocarbon purification for a low-temperature fuel-rich exhaust gas (such as exhaust gas emitted during cold start) of automobile.

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Nagoya, Japan

Yukinari Shibagaki