Toyota Jidosha Kabushiki Kaisha

Nippon Soken, Inc.

Cataler Corporation

Juji Suzuki

Makoto Tsuji

Shinji Tsuji

Daisuke Oki

Naohisa Oyama

Shigeki Daido

Norio Taguchi

Kodo Kawase

Hitoshi Kato

Takayuki Shibuya

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 filterfor collecting PMs, a microwave transmitterfor emitting electromagnetic waves whose frequency is dozens of GHz-a few of THz onto the filter, a microwave receiverfor detecting an intensity of the electromagnetic waves that have transmitted through the filter, and a computing means for computing a collection amount of PMs from the intensity that has been detected with the microwave receiverare included. Since it is possible to detect the distribution of the collection amount of PMs with good accuracy, it is possible to carry out a recycling process in a state where the collection amount does not become too much, and thereby it is possible to make a reducing-agent supply amount into exhaust gases minimum at the time of the recycling process.

Collection-amount detection method for particulate matters and collection-amount detection apparatus therefor and exhaust-gas converting apparatus

A process for producing an exhaust-gas-purifying catalyst includes the steps of immersing a porous support into a solution including a noble metal catalyst ingredient, thereby preparing a support with a noble metal catalyst ingredient loaded thereon, and thermally treating the noble-metal-catalyst-ingredient-loaded support at a temperature of 800.degree. C. or more in non-oxidizing atmosphere. In the thermally-treating step, the noble metal catalyst ingredient is prevented from being oxidized to its oxide, and accordingly it is inhibited from migrating in vapor phase. Further, in the thermally-treating step, pores of the porous support are contracted so that they surround the noble metal catalyst ingredient closely therein. All in all, the noble metal catalyst ingredient is prevented from sintering. Thus, the resulting exhaust-gas-purifying catalyst is of superb heat-resistance, and it can be applied to elevated temperatures of 800.degree. C. or more in fuel-lean atmosphere.

Process for producing exhaust-gas-purifying catalyst

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Toyota, Japan

Juji Suzuki