Cataler Corporation

Toyota Jidosha Kabushiki Kaisha

Daisuke Oki

Makoto Tsuji

Norihiko Aono

Yoshinori Yamashita

Seiji Okawara

Keigo Hori

Mai Huong Tran

Juji Suzuki

Yuya Kawano

Koji Senda

Takuya Sato

Juji c/o Toyota Jidosha Kabushiki Kaisha Suzuki

The exhaust gas purification catalyst disclosed here is an exhaust gas purification catalyst disposed in the exhaust pipe of an internal combustion engine to purify nitrogen oxides contained in exhaust gas discharged from the internal combustion engine, provided with a silver alumina catalyst comprising at least alumina as a catalyst and silver supported on this alumina, wherein, in the silver alumina catalyst, the ratio of the peak intensity at a wave number of 1595 cmto the peak intensity at a wave number of 1613 cmby the pyridine IR method is at least 0.3, and the carried amount of the silver is 1.0 wt % to 6.0 wt % given 100 wt % as the total amount of the silver alumina catalyst.

Exhaust gas purification catalyst and method for manufacturing exhaust gas purification catalyst

An exhaust gas-purifying system for purifying exhaust gas discharged from a diesel engine includes a diesel oxidation catalyst through which the exhaust gas passes, a diesel particulate filter which includes a filter substrate and an active component supported by the filter substrate and exhibiting a catalytic activity for selective catalytic reduction and through which the exhaust gas having passed through the diesel oxidation catalyst penetrates, and an ammonia slip catalyst which includes a zeolite whose alkaline metal ions are partially exchanged with transition metal ions and through which the exhaust gas having penetrated the diesel particulate filter passes.

Exhaust gas-purifying system

To provide a filter catalyst in which the closure of ventilation holes by a catalytic layer is inhibited. A filter catalyst of the present is characterized in that, in a filter catalyst comprising: a catalyst-support substrate; and a catalytic layer; an SEM photograph on a cross section of the filter catalyst is turned into electronic data so that, in a processed image in which image processing is performed to the SEM photograph, a ratio of a number of pixels forming an outer periphery of the catalytic layer to a number of pixels forming the catalytic layer is 0.5 or more. An analyzing method of the present invention finds a ratio a number of pixels forming an outer periphery of the catalytic layer to a number of pixels forming the catalytic layer by performing image processing to a cross section of the filter catalyst. The filter catalyst of the present invention has an effect of being capable of inhibiting the rise of pressure loss when sufficient particulates deposit. Moreover, the analyzing method of the present invention can analyze the uniformity of the catalytic layer of the filter catalyst.

Filter catalyst and method of analyzing a catalytic layer thereof

A filter catalyst of the present invention is comprised of a catalyst-supporting substrateand catalytic portionsfor purifying an exhaust gas. The catalytic portions includes the first catalytic portionfor purifying HC, CO and NO, and the second catalytic portionfor purifying the particulates. The first catalytic portionis formed on a surface of at least a portion of the cellular walland the second catalytic portionis formed on an inside surface of the pores. In the filter catalyst of the present invention purifying ability of the exhaust gas is increased, and the filter catalyst of the present invention can suppress rise of the pressure loss of the exhaust gas.

Filter catalyst

To provide a process for producing a filter catalyst which can produce a filter catalyst in which the closure of ventilation holes by a catalytic layer is inhibited. A process for producing a filter catalyst according to the present invention is characterized in that, in a process for producing a filter catalyst, the process comprising: a step of preparing a coating slurry in which an inorganic oxide powder is dispersed, and coating the coating slurry onto a catalyst-support substrate composed of a porous material having a plurality of cells extending in the axial direction; a step of removing the coating slurry in excess from the catalyst-support substrate with the coating slurry coated; and a step of drying-calcining the coating slurry; the removing of the coating slurry in excess is carried out by performing the following steps repeatedly: a step of holding one of the axial opposite ends of the catalyst-support substrate and another axial opposite end thereof in such a state that a pressure difference is given therebetween; and a step of holding the one of the opposite ends of the catalyst-support substrate and the other opposite end thereof in an identical pressure state. The present production process can produce a filter catalyst in which sufficient ventilation property is secured so that it has come not to induce the rise of pressure loss.

Process for producing a filter catalyst

To provide a filter catalyst in which the closure of ventilation holes by a catalytic layer is inhibited. A filter catalyst of the present invention is characterized in that it has pores of 1-20 &#x3bc;m in a porosity of 11% or more. The filter catalyst of the present invention has an effect of being capable of inhibiting the rise of pressure loss when sufficient particulates deposit.

Growing community of inventors

Kakegawa, Japan

Daisuke Oki