Three-dimensional ordered mullite catalyst and its preparation method and purification method
A three-dimensional ordered, mullite technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of reduced effective active surface area of catalysts, high cost, and limited industrial production applications, etc. Problems, to achieve the effect that is conducive to popularization and application, strong practicability, and easy to implement
Active Publication Date: 2020-05-19
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
Generally, the diameter of carbon particles is relatively large (usually greater than 25 nanometers), while the pore diameter of general catalysts is usually less than 10 nanometers. It is difficult for carbon particles to enter the pores of the catalyst and can only contact with its surface, resulting in a decrease in the effective active surface area of the catalyst.
In addition, Pt-supported V2O5 / Al2O3 noble metal catalysts are commonly used at this stage. These noble metal catalysts have good catalytic activity on carbon particles, but the cost is very expensive, which limits their industrial production applications.
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preparation example Construction
[0035] The preparation method of the above-mentioned three-dimensional ordered mullite comprises the following steps:
[0036] Step 1, according to the chemical formula of the three-dimensional ordered mullite catalyst, the nitrate containing the active component is miscible in the complexing agent and the wetting agent according to the predetermined metering ratio, so as to obtain the three-dimensional ordered mullite catalyst precursor solution.
[0037] In this embodiment, the complexing agent is ethylene glycol or citric acid, the wetting agent is methanol or water; the predetermined ratio Sm:Mn=1:2; the total amount of metal ions in the precursor solution is The concentration is 0.5mol / L~2mol / L.
[0038] Step 2, soaking the precursor solution onto the colloidal crystal template and performing suction filtration and drying, and then roasting in an inert gas and an oxygen-containing gas to remove the colloidal crystal template to obtain the three-dimensional ordered mullit...
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The invention belongs to the technical field related to carbon particle purification. It discloses a three-dimensional ordered mullite catalyst, which is suitable for the catalytic oxidation of carbon particles emitted by diesel locomotives; the three-dimensional ordered mullite catalyst is a mullite catalyst with a macroporous structure. A mullite-type composite metal oxide, the macroporous structure is a uniform and ordered inverse opal structure; the three-dimensional ordered mullite catalyst includes active components, and the active components include rare earth metals and transition metals. The invention also relates to a preparation method and a purification method of a three-dimensional ordered mullite catalyst. The present invention mainly uses rare earth metals and transition metal elements and has low cost; the macroporous structure can promote the carbon particles to enter the interior of the pores and diffuse smoothly, so that the carbon particles fully contact the surface of the catalyst, thereby improving the catalytic performance.
Description
technical field [0001] The invention belongs to the technical field related to the purification of carbon particles, and more specifically relates to a three-dimensional ordered mullite catalyst, a preparation method thereof, and a purification method. Background technique [0002] Diesel engines have significant characteristics such as high thermal efficiency and good economy. Therefore, the degree of dieselization of high-power motor vehicles continues to increase, but the carbon particulate matter (PM) emissions of diesel locomotives are 30 to 80 times that of automobiles, and 70% of them are carbon particulate matter. The particle size is less than 300nm, and it is adsorbed with multiple organic compounds. After being inhaled by the human body, it can rise into the alveoli, and it is extremely difficult to be excreted from the body, which is very harmful to the human body. Therefore, how to effectively reduce the emission of carbon particles in the air is the primary tas...
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Patent Timeline
Login to View More IPC IPC(8): B01J23/34B01J35/10B01J37/08B01D49/00C01G45/12
CPCB01D49/00C01G45/1285B01J23/002B01J23/34B01J37/0009C01P2004/30C01P2004/03C01P2002/72B01D2258/012B01J35/23B01J35/651
Inventor 单斌陈永杰陈蓉冯子健胡镔
Owner HUAZHONG UNIV OF SCI & TECH