Oxidation catalyst suitable for combustion of light oil component
An oxidation catalyst and light oil technology, applied in physical/chemical process catalysts, catalyst activation/preparation, separation methods, etc., can solve problems such as insufficient temperature rise, and achieve excellent heat resistance and durability
Active Publication Date: 2014-12-17
MITSUI MINING & SMELTING CO LTD
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Problems solved by technology
However, in general, the temperature rise is not sufficient only by the heat of the exhaust gas, and it is very difficult to completely burn the particulates and eliminate the clogging of the DPF.
Method used
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Embodiment 1～6 and comparative example 1
[0035] The mixture has peaks of various pore distributions described in Table 1 measured with a mercury porosimeter, and contains 4 mass % of La 2 O 3 And the specific surface area is 150m 2 180 g of any La-stabilized θ alumina porous body per g, 100 g of alumina sol with an alumina concentration of 20 mass %, and 320 g of pure water, to which were added predetermined amounts of an aqueous solution of dinitrodiammine platinum and palladium nitrate The aqueous solution was stirred for 30 minutes to prepare a slurry for catalyst coating. This slurry was applied on a cordierite honeycomb base material (300 holes / square inch, wall thickness 8 mm) having a diameter of 143.8 mm and a length of 76.2 mm, and the excess slurry was removed by blasting. Next, it was dried at 120°C for 3 hours, and then fired at 500°C for 1 hour in air. The obtained DOC structure was coated with 100 g of the catalyst per 1 liter of the cordierite-made honeycomb substrate. The loading of Pt was 1.6 g / L...
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Abstract
An object of the present invention is to provide an oxidation catalyst (DOC) which, even after long-term use thereof, is suitable for combustion, at a relatively low temperature, of a light oil component supplied upon regeneration of a diesel particulate filter (DPF), and which exhibits excellent thermal resistance and excellent durability. The oxidation catalyst (DOC) of the present invention suitable for combustion of a light oil component contains an alumina porous body whose pore size distribution profile, as determined by means of a mercury porosimeter, has a peak falling within a range of 10 to 100 nm, and a noble metal supported on the surface of the alumina porous body and / or on the inner walls of pores of the alumina porous body. The oxidation catalyst (DOC) product of the present invention includes a catalyst support made of a ceramic or metallic material, and the aforementioned oxidation catalyst (DOC) supported on the catalyst support.
Description
technical field [0001] The present invention relates to an oxidation catalyst suitable for the combustion of light oil components, and in particular to an oxidation catalyst (hereinafter referred to as DOC) which can be placed in the exhaust gas flow of a diesel engine together with a diesel particulate filter (hereinafter referred to as DPF) The inside of the road is arranged on the more upstream side of the DPF, and the light oil component supplied at the time of regeneration of the DPF is combusted at a relatively low temperature. Background technique [0002] Diesel engine exhaust gas contains particulates (particulates), and most of the particulates are composed of coal and soluble organic matter, and cause environmental pollution, and therefore its removal treatment is important. [0003] In order to prevent particulates from being discharged into the atmosphere, it is effective to provide a DPF in the exhaust gas flow path to trap particulates. However, as the partic...
Claims
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IPC IPC(8): B01J35/10B01D53/94B01J23/63F01N3/28
CPCB01D2255/9205B01J23/63B01J21/04B01D2255/2092B01D53/944B01D2255/1021B01J37/0215B01J23/40F01N3/103B01D2255/1025F01N3/035B01D2255/1023B01J35/1066B01J35/1061B01J35/651B01J35/647
Inventor 古川孝裕阿部晃
Owner MITSUI MINING & SMELTING CO LTD