A large-pore sio for soot combustion 2 One-pot synthesis method of materials and products thereof

A synthesis method and soot combustion technology, applied in the direction of combustion method, combustion type, chemical instrument and method, etc., can solve the problems of high cost and complex process, achieve high catalytic activity, simple preparation process, and facilitate industrial production Effect

Active Publication Date: 2021-08-10
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of organic templates are needed in the synthesis process of this type of catalyst, and the templates must be removed by calcination at high temperature, which eventually leads to the disadvantages of complex process and high cost.

Method used

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  • A large-pore sio for soot combustion <sub>2</sub> One-pot synthesis method of materials and products thereof
  • A large-pore sio for soot combustion <sub>2</sub> One-pot synthesis method of materials and products thereof
  • A large-pore sio for soot combustion <sub>2</sub> One-pot synthesis method of materials and products thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Mix 20g of silicate with 200g of water, stir until completely dissolved; then add 1g of sodium aluminate until completely dissolved; add HNO 3 To pH 5.5, place and age at 70°C for 12 hours; soak the mixed colloid in deionized water for 6 hours to release excess cations; dry the soaked colloid, and bake it at 400°C for 6 hours to make the active center and the carrier better bonded. The final preparation of alkali metal doped macroporous SiO 2 catalytic material. Effects of different mass ratios of silicate and water on alkali metal doped macroporous SiO 2 The catalytic properties of the materials are shown in Table 1

[0027] Table 1 The effect of silicate species on alkali metal doped macroporous SiO 2 The catalytic performance of the

[0028]

[0029]

Embodiment 2

[0031] Mix 20g of lithium silicate with 200g of water and stir until it is completely dissolved; then add 1g of sodium aluminate until it is completely dissolved; add inorganic acid until the pH is 5.5, and place it for aging at 70°C for 12 hours; soak the mixed colloid in deionized water, Soak for 6 hours to release excess cations; dry the colloid after soaking, and bake at 400°C for 6 hours to better combine the active center with the carrier. The final preparation of alkali metal doped macroporous SiO 2 catalyst. Alkali metal doped macroporous SiO with different inorganic acids 2 The catalytic properties of the materials are shown in Table 2

[0032] Table 2 Effects of different inorganic acids on alkali metal doped macroporous SiO 2 The catalytic performance of the

[0033] Inorganic acid Complete catalytic combustion temperature of soot (°C) Average pore size (nm) HCl 485 76 HNO 3

Embodiment 3

[0035] Mix 20g of lithium silicate with a certain amount of water, stir until completely dissolved; then add 1g of sodium aluminate until completely dissolved; add HNO 3 To pH 5.5, place and age at 70°C for 12 hours; soak the mixed colloid in deionized water for 6 hours to release excess cations; dry the soaked colloid, and bake it at 400°C for 6 hours to make the active center and the carrier better bonded. The final preparation of alkali metal doped macroporous SiO 2 catalyst. Alkali metal doped macroporous SiO with different mass ratios of lithium silicate and water 2 The catalytic properties of the materials are shown in Table 3

[0036] Table 3 Mass ratio of lithium silicate to water versus alkali metal doped macroporous SiO 2 The catalytic performance of the

[0037] The mass ratio of lithium silicate to water Complete catalytic combustion temperature of soot (°C) Average pore size (nm) 0.05 475 84 0.1 475 80 0.15 477 78 0.25 480...

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Abstract

The invention discloses a macroporous SiO used for soot combustion 2 One-pot synthesis of materials and their products. The present invention uses specific silicate as silicon source, sodium aluminate as aluminum source, specific silicate cation as active center, inorganic acid as pH regulator, water as solvent, silicate and aluminate Sodium is hydrolyzed under the catalysis of inorganic acid, and SiO with macroporous structure is obtained. 2 At the same time as the carrier, the alkali metal and Al 2 o 3 The active centers are highly dispersed in SiO 2 On the surface of the carrier, the finally prepared catalyst not only has high catalytic activity for the soot combustion reaction, but also has a simple preparation process and is convenient for industrial production.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a macroporous SiO used for soot combustion 2 One-pot synthesis of materials and their products. Background technique [0002] Soot is a primary particulate matter produced by coal and oil combustion. It is non-toxic in itself, but it often contains SO 2 And other hydrocarbons, such as carcinogenic polycyclic aromatic hydrocarbons, will cause serious pollution to the atmospheric environment. Nowadays, the control technology of soot is generally catalytic combustion method. The principle is that soot is adsorbed on the inner surface of the catalyst to promote the combustion reaction between soot and oxygen. However, the diameter of soot particles is generally large (usually greater than 25nm), while the pore size of ordinary catalysts is usually much lower than 25nm, so it is difficult for soot particles to enter the catalyst pores to react, and they can only contact the outer...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B01J23/04B01J35/02F23G7/07
CPCB01J23/04B01J35/02F23G7/07
Inventor王卉陈丹丹曹莹莹陈泽文邓兴宇
OwnerHANGZHOU DIANZI UNIV