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Three-dimensional ordered macroporous-mesoporous titanium-silicon composite oxide carrier supported K-OMS-2 (Cryptomelane) catalyst and preparation method thereof

A K-OMS-2, composite oxide technology, used in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the loss of active components, catalyst activity problems such as decrease in particle size, to achieve the effects of uniform particle size, low cost and simple preparation process

Active Publication Date: 2019-04-09
SHENYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the low melting point alkali metal salt is easily lost in the reaction as the active component of the catalyst, resulting in a decrease in the activity of the catalyst.

Method used

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  • Three-dimensional ordered macroporous-mesoporous titanium-silicon composite oxide carrier supported K-OMS-2 (Cryptomelane) catalyst and preparation method thereof
  • Three-dimensional ordered macroporous-mesoporous titanium-silicon composite oxide carrier supported K-OMS-2 (Cryptomelane) catalyst and preparation method thereof
  • Three-dimensional ordered macroporous-mesoporous titanium-silicon composite oxide carrier supported K-OMS-2 (Cryptomelane) catalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0036] According to a specific embodiment of the present invention, the three-dimensional ordered macroporous-mesoporous titanium-silicon composite oxide carrier is loaded with K-OMS-2 nanoparticle catalyst, and the method of the following steps is adopted:

[0037] Preparation of Monodisperse Polymer Microspheres by Soap-free Emulsion Polymerization

[0038] Take 160-240mL of distilled water, add it to a round bottom flask, heat it in a water bath to 60-80°C, add 90-120mL of MMA, stir at an appropriate speed for 5-20min, then add 0.3-0.8 g weighed in advance Initiator K 2 S 2 o 8 (dissolve with 20-40mL water and heat to the same temperature). The reaction was continued for 1-5h under continuous stirring, and a milky white suspension was obtained. The particle size of the obtained microspheres is relatively uniform, and the use of the microspheres can make the finally obtained metal oxide have a better shape and structure. Such as figure 1 Shown, the particle diameter of...

Embodiment 2

[0040] Preparation of Colloidal Crystal Templates by Centrifugal Deposition

[0041] Place the microsphere emulsion in a centrifuge tube and centrifuge at 3000rpm for 10h to obtain a tightly packed colloidal crystal template, or place the microsphere emulsion in a flat-bottomed container and evaporate slowly in a drying oven at a temperature of 60°C. Deposition yields colloidal crystal templates. The scanning electron microscope images of the synthesized colloidal crystals are shown in image 3 As shown, the colloidal crystal template presents a hexagonal arrangement, forming a close-packed structure dominated by face-centered cubic (fcc).

Embodiment 3

[0043] 3DOM-mTi with different ratios of titanium to silicon x Si 1-x o 2 Preparation of composite oxide supports

[0044] By 3DOM-m Ti 0.9 Si 0.1 o 2 、3DOM-m Ti 0.7 Si 0.3 o 2 、3DOM-m Ti 0.5 Si 0.5 o 2 、3DOM-mTi 0.3 Si 0 . 7 o 2 、3DOM-m Ti 0.1 Si 0.9 o 2 The proportional relationship of the prepared 3DOM-m Ti was weighed respectively x Si 1-x o 2 12.24g, 9.52g, 6.8g, 4.08g, 1.36g of tetrabutyl titanate precursor materials were placed in 5 beakers, and then 0.832g, 2.496g, 4.16g, 5.824g, 7.488g tetraethyl orthosilicate, then add 5-10g ethanol and 3-8g P123 to 5 beakers, then put them on the stirrer and stir to form a clear solution, then slowly drop the above clear solution into 5 beakers respectively -10gHCl and 1-5mLH 2 O in five beakers. Finally, place the above mixed solution under magnetic stirring in a 30-60°C water bath and stir for 1-5 hours to obtain a uniform and transparent titanium-silicon precursor solution. After standing for 1-5 hours, use...

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Abstract

The invention relates to a preparation method of a three-dimensional ordered macroporous-mesoporous titanium-silicon composite carrier (3DOM-m TixSi1-xO2) supported cryptomelane-type potassium-manganese composite oxide (K-OMS-2) nanoparticle catalyst and an application in catalytic combustion of soot particles. The three-dimensional ordered macroporous-mesoporous carrier is a composite oxide withdifferent silicon-titanium raios. Three-dimensional ordered macropores have an average pore diameter of 50 nm to 1 micron, and three-dimensional ordered mesopores have an average pore diameter of 2-30nm; a method in combination with soft and hard templates is mainly adopted by the preparation method, wherein polymethyl methacrylate microspheres are adopted as a template of the hard template, andP123 (Polyethylene Oxide-Polypropylene Oxide-Polyethylene Oxide) is adopted as the soft template. Finally, the three-dimensional ordered macroporous-mesoporous titanium-silicon carrier supported highly-dispersed K-OMS-2 nanoparticle catalyst is synthesized by taking low-cost potassium permanganate as a raw material through an equivalent-volume impregnation method with simple operation. The preparation method involved by the invention has the advantages that no special equipment and harsh conditions are needed, the process is simple, the controllability and practicability are high.

Description

technical field [0001] The invention belongs to the technical field of preparation of catalyst materials, in particular to a preparation method of a three-dimensional ordered macroporous-mesoporous titanium-silicon composite oxide loaded cryptopotassium manganese ore-type potassium-manganese composite oxide (K-OMS-2) nanoparticle catalyst with application. Background technique [0002] Compared with gasoline engines, diesel engines have significant advantages such as higher economy, lower emissions and better durability, so diesel engines have become ideal for automobiles and ships. However, diesel engines emit a large amount of soot particles, causing serious pollution to the environment. At the same time, charcoal smoke particles are the carriers of strong carcinogens, benzopyrene and nitro-condensed aromatic hydrocarbons, which are extremely harmful to human health. Therefore, controlling the emission of soot and particulate matter from diesel engine exhaust is an impor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34F01N3/28
CPCB01J23/34F01N3/2803
Inventor 于学华赵震陈茂重范晓强王斓懿王瑞丹周振田史建军
Owner SHENYANG NORMAL UNIV
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