Coating slurry, preparation method and application thereof

A technology for coating slurry and slurry, which is applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, catalyst carriers, etc., and can solve the problems of lack of detail, inability to form a uniform mixed slurry, and few problems.

Active Publication Date: 2013-01-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the careful study of coating slurries in the prior art
Some existing technologies are not detailed in the introduction of the preparation of the slurry, cannot be repeated, or cannot form a uniformly mixed slurry at all

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 46g of pseudoboehmite, 10g of cerium oxide, 8g of zirconia, 21g of lanthanum nitrate, nano-TiO 2 5g, 2g of copper nitrate, 2.8g of manganese nitrate and 2.7g of aluminum nitrate were dissolved in 100g of deionized water, stirred slightly with a glass rod and then moved into a ball mill jar. After ball milling for 5 hours, pour the obtained slurry into a beaker while stirring. Add 0.3ml of concentrated nitric acid, the stirring speed is 600 rev / min, the stirring time is 4 hours, let stand for 2 hours, the pH of the prepared coating slurry is 6.2, the solid content is about 45%, and the solid content contains 56wt% pseudothin Diaspore, 19wt% zirconia and ceria, 10wt% lanthanum oxide, 6.0wt% nano-titanium dioxide, 2.4wt% copper nitrate, 3.4wt% manganese nitrate, 3.2wt% aluminum nitrate.

Embodiment 2

[0019] Weigh 22g of pseudoboehmite, 7.5g of cerium nitrate, 8.2g of zirconium nitrate, 26.6g of lanthanum nitrate, nano-TiO 2 Dissolve 0.8g, 0.8g of copper nitrate, 1.2g of manganese nitrate and 3g of aluminum nitrate in 100g of deionized water, stir slightly with a glass rod, and then move it into a ball mill jar. After ball milling for 4 hours, pour the obtained slurry into a beaker while stirring While adding concentrated nitric acid 0.6ml, the stirring speed is 800 rpm, the stirring time is 6 hours, after standing for 2 hours, add 4g sodium bicarbonate and stir vigorously for 40min, the stirring speed is 1000 rpm, the temperature is 30°C, the coating is prepared The pH of the layer slurry is 5.0, the solid content is about 30%, and the solid content contains 50wt% pseudoboehmite, 14wt% zirconia and cerium oxide, 23wt% lanthanum oxide, 1.8wt% nano-titanium dioxide, 1.8wt% % copper nitrate, 2.7wt% manganese nitrate, 6.7wt% aluminum nitrate.

Embodiment 3

[0021] Weigh 19.2g of pseudo-boehmite, 4.7g of cerium-zirconium powder, 6.3g of lanthanum nitrate, nano-TiO 2 1.2g, 1.6g of copper nitrate, 2.4g of manganese nitrate and 2.1g of aluminum nitrate were dissolved in 100g of deionized water, stirred slightly with a glass rod, then moved into a ball mill jar, after ball milling for 8 hours, pour the obtained slurry into a beaker Add 0.8ml of concentrated nitric acid while stirring, the stirring speed is 500 rpm, the stirring time is 2 hours, after standing for 1 hour, add 2.5g urea and stir vigorously for 30min, the stirring speed is 800 rpm, the temperature is 35°C, the preparation is completed The pH of the coating slurry is 3.8, the solid content is about 25%, and the solid content contains 57wt% pseudoboehmite, 14wt% zirconia and cerium oxide, 7.2wt% lanthanum oxide, 3.6wt% nano-titanium dioxide, 4.8wt% copper nitrate, 7.1wt% manganese nitrate, 6.3wt% aluminum nitrate.

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Abstract

The invention discloses a coating slurry, a preparation method and an application thereof. The solid content of the coating slurry is 20%-50%, and its pH is 2.5-6.5. According to the solid content, the coating slurry contains the following components of: by weight, 40-80 wt% of pseudoboehmite, 5-40 wt% of zirconium oxide and cerium oxide, 5-40 wt% of lanthanum oxide, 1-15 wt% of nanometer titania, 1-10 wt% of copper nitrate, 0.5-15 wt% of manganese nitrate and 1-10 wt% of aluminum nitrate. The preparation method of the coating slurry comprises the following steps of: weighing an appropriate amount of pseudoboehmite, cerium-zirconium oxide or nitrate, nano-sized TiO2, copper, manganese and aluminum nitrate, putting into a ball milling tank for ball milling so as to obtain an uniform slurry; taking out the slurry which has undergone ball milling, adding concentrated nitric acid and stirring to prepare the coating slurry. The application of the coating slurry comprises the following steps of: immersing a cordierite carrier into the coating slurry for 10-30 min, taking out, blowing off residual liquid in pore canal, drying at the temperature of 90-130 DEG C for 5-7 hours, and roasting in the air of 500-600 DEG C, so as to prepare a coating-containing catalytic combustion catalyst carrier. The coating slurry provided by the invention has high solid content, is easy to coat, and has strong adhesion with a carrier and high specific surface area.

Description

technical field [0001] The invention relates to a coating slurry and its preparation method and application, in particular to a coating slurry of a catalytic combustion catalyst with high solid content and its preparation and application. Background technique [0002] Coating slurry is a mixture of solids and liquids uniformly mixed and stable in properties, and is an important precursor for preparing catalytic combustion catalysts. In the preparation process of the catalyst, the coating slurry needs to be coated on the cordierite carrier, in order to increase the specific surface area of ​​the catalyst carrier, so that the active material is highly dispersed on the surface. A good coating slurry should have the following advantages: first, a higher coating specific surface area, which is an important indicator for evaluating catalysts, and its size has a significant impact on the thermodynamic properties, adsorption capacity, and chemical stability of the catalyst coating. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J32/00
Inventor 刘新友王学海陈玉香
Owner CHINA PETROLEUM & CHEM CORP
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