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Oxygen vacancy-contained VOCs eliminating catalyst and preparation method thereof

An oxygen deficiency, catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as poor activity and low light-off temperature, and achieve improved combustion. The effect of activity, small particle size and abundant raw materials

Active Publication Date: 2019-01-22
FUJIAN LONGKING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this type of catalyst is cheap, compared with noble metal catalysts, there are still problems such as low light-off temperature and poor activity. Therefore, it is particularly important to find ways to improve the activity of this type of catalyst.

Method used

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  • Oxygen vacancy-contained VOCs eliminating catalyst and preparation method thereof
  • Oxygen vacancy-contained VOCs eliminating catalyst and preparation method thereof
  • Oxygen vacancy-contained VOCs eliminating catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Weigh 2.125g Co(NO 3 ) 2 ·6H 2 O, 2.364g Ce(NO 3 ) 3 ·6H 2 O and 4.2g urea are added into the water of 225ml and stirred to dissolve evenly, then add 3% dilute nitric acid dropwise to adjust the pH to be 2.5;

[0052] (2) Measure 22.4ml Si(OC 2 h 5 ) 4 and 40ml CH 3 CH 2 Add OH into the beaker, stir, and sonicate for 20 minutes to form a uniform and stable solution;

[0053] (3) Add the solution prepared in step 2 dropwise to the solution obtained in step 1 under stirring, and then stir for 4 hours;

[0054] (4) Put the solution prepared in step 3 into an oil bath at 90°C and heat it at a speed of 100 rad / min, while preventing water loss;

[0055] (5) After heating for 40 hours, the pH rises to about 8, and the solution becomes a gel state;

[0056] (6) Rinse the obtained gel three times with ethanol and deionized water respectively, put it in an oven at 80°C and dry it for 10 hours, grind the obtained solid and sieve it with an 80-mesh sieve;

[0057] ...

Embodiment 2

[0063] Except that the reduction time in step (7) in Example 1 is set to 0.5h, other experimental steps are carried out using the method of Example 1 to obtain a supported catalyst CoO containing certain oxygen defects. x -CeO x / SiO 2 .

[0064] Test the concentration of oxygen vacancies in the catalyst by ESR (Electron Spin Resonance), see the test results figure 2 , figure 2 The ESR figure of the catalyst prepared for the embodiments of the present invention and comparative examples, figure 2 Among them, curve 2a is the ESR figure of the supported catalyst containing oxygen deficiency prepared in Comparative Example 1, curve 2b is the ESR figure of the supported catalyst containing oxygen deficiency prepared in Comparative Example 2, and curve 2c is the supported catalyst prepared in Example 1 The ESR figure of catalyst, curve 2d is the ESR figure of the supported catalyst prepared in embodiment 2; By figure 2 It can be seen that the catalyst prepared by the presen...

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Abstract

The invention provides an oxygen vacancy-contained VOCs eliminating catalyst. The oxygen vacancy-contained VOCs eliminating catalyst comprises a SiO2 carrier and oxygen vacancy-contained cobaltous oxide / cerium oxide loaded onto the SiO2 carrier. The invention further provides a preparation method of the oxygen vacancy-contained VOCs eliminating catalyst. According to the method, cobalt salt, cerium salt, urea and tetraethoxysilane are used as raw materials, and a sol-gel method and a temperature programming controllable hydrogen gas reduction method are adopted for preparing the loaded catalyst with silicon dioxide used as the carrier and the oxygen vacancy-contained cobaltous oxide / cerium oxide used as an active component. The oxygen vacancy-contained cobaltous oxide / cerium oxide has higher electron cloud density, is beneficial for adsorbing an oxygenated chemical formaldehyde and oxygen, and can promote the catalytic combustion activity of the catalyst; moreover, in the catalyst, theactive component is even in distribution, smaller in particle size, and beneficial for improving the activity of the catalyst of catalyzing formaldehyde combustion.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to a VOCs elimination catalyst containing oxygen defects and a preparation method thereof. Background technique [0002] Volatile organic compounds (VOCs) refer to organic compounds with a saturated vapor pressure greater than 70Pa at normal temperature and a boiling point below 260°C at normal pressure, including alkanes, aromatics, halogenated hydrocarbons, alcohols, ethers, fats, etc., which are common sources in industry There are petrochemical, printing, spraying and other industries. Most VOCs are toxic, have a pungent smell, and some are carcinogenic, which is a huge hazard to human health; VOCs can also undergo photochemical reactions with nitrogen oxides in the atmosphere under the action of sunlight to generate more harmful photochemical smog. It has become one of the main air pollutants in my country in recent years. With the promulgation of increasingly str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J37/08B01J37/18B01J37/03B01D53/86B01D53/44
CPCB01D53/8687B01J23/83B01J37/036B01J37/088B01J37/18B01D2257/708B01J35/393Y02A50/20
Inventor 赵亚飞陈功骞巫毅飞陈艺聪
Owner FUJIAN LONGKING
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