La-Stabilized Alumina DOC for Low-Temp Light Oil Combustion
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Solution Overview
Problem
Conventional oxidation catalysts (DOCs) experience elevated combustion temperatures of light oil over time, leading to inefficiencies in diesel particulate filter (DPF) regeneration and potential clogging, necessitating a solution for low-temperature combustion and improved thermal resistance and durability.
Innovation Solution
A DOC comprising an La-stabilized alumina porous body with a specific pore size distribution peak of 30 to 55 nm, supported with noble metals like Pt, Pd, or Rh, which maintains low ignition temperatures for light oil combustion even after long-term use, and is supported on a ceramic or metallic catalyst substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional DOC is used for light oil combustion, then combustion occurs at a relatively low temperature at an early stage of use, but the combustion temperature tends to be elevated after long-term use
Solution Approach 1:
The patent applies parameter changes by optimizing the pore size distribution of the alumina support, specifically controlling the pore volume in the 30-55 nm range. This structural parameter modification maintains stable light oil combustion temperature throughout the catalyst's service life, preventing the temperature elevation that occurs with conventional catalysts after long-term use.
2Area of stationary object
If the pore size of the alumina porous body is too small, then the surface area is large, but the light oil combustion temperature becomes excessively high
Solution Approach 1:
The patent applies local quality by creating a specific pore size distribution within the alumina porous body, with increased pore volume in the 30-55 nm range. This localized structural characteristic optimizes the balance between surface area and combustion temperature, allowing high surface area while maintaining appropriate combustion temperature levels.
3Temperature
If the pore size of the alumina porous body is too large, then the combustion temperature is low, but the thermal resistance and durability are reduced
Solution Approach 1:
The patent applies parameter changes by establishing a specific pore size distribution with peak pore volume in the 30-55 nm range. This optimized parameter configuration simultaneously achieves low combustion temperature and high thermal resistance, preventing the durability reduction that occurs with larger pore sizes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The DOC effectively combusts light oil at a low temperature during DPF regeneration, even after extended use, while exhibiting excellent thermal resistance and durability, preventing DPF clogging and maintaining efficient exhaust gas processing.
Implementation Method 1
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
Implementation Method 2
combustion of a light oil component supplied upon regeneration of the DPF
Data Source
AI summary
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.