Layered perovskite type catalyst compounding method and composite catalyst

A composite catalyst and perovskite-type technology, which is applied in the direction of heterogeneous catalyst chemical elements, catalyst protection, chemical instruments and methods, etc., can solve the problems of perovskite-type catalysts such as easy poisoning and deactivation

Inactive Publication Date: 2022-01-07
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the technical problem that the perovskite-type catalysts prepared in the prior art are easy to be poisoned and deactivated, a layered perovskite-type catalyst composite method and composite catalyst are provided. Liquid pair perovskite type composite oxide powder is used as the catalyst core (110) to wrap and prepare, which is beneficial to improve the above technical problems

Method used

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  • Layered perovskite type catalyst compounding method and composite catalyst
  • Layered perovskite type catalyst compounding method and composite catalyst
  • Layered perovskite type catalyst compounding method and composite catalyst

Examples

Experimental program
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Embodiment 1

[0048] A kind of layered perovskite type catalyst composite method of the present embodiment, its specific preparation process is as follows:

[0049] Step 1, preparation of perovskite type composite oxide powder.

[0050] (1) Preparation of powder precursor: Weigh 0.1mol of cerium nitrate, 0.1mol of manganese acetate and 0.15mol of citric acid and dissolve them in 1000ml of deionized water. After completely dissolving, stir at 90°C at a speed of 250r / min, and stir the mixture for 4h It appears as a colloid, baked in an oven at 105°C for 24 hours to obtain a dry precursor, and grinds the dried precursor powder to obtain a precursor powder with a mesh size of less than 400;

[0051] (2) Precursor calcination: The precursor powder is roasted in a muffle furnace, and the temperature is raised to 300°C at a heating rate of 10°C / min in an air atmosphere, kept for 1h, and then heated to 1000°C at a heating rate of 2°C / min. ℃ and keep it warm for 2 hours, after the heat preservation...

Embodiment 2

[0077] This embodiment is used as a benchmark experiment, and the experimental process of this comparative example is the same as that of Example 1, except that: (4) powder modification in step one is not adopted, and all steps of step two are not adopted. The experimental results are recorded in Table 3 as a benchmark for later experiments.

[0078] table 3

[0079]

Embodiment 3

[0081] The experimental process of this embodiment is the same as that of Example 1, except that: (4) powder modification in step 1 is not used, and cerium nitrate is not added in the preparation of mixed solution B in step 2 (2). The experimental results are recorded in Table 4.

[0082] Table 4

[0083]

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Abstract

The invention discloses a layered perovskite type catalyst compounding method and a composite catalyst, and relates to the technical field of catalysts. According to the invention, perovskite type composite oxide powder is coated as a catalyst core with a mixed solution of ethyl orthosilicate and tetrabutyl titanate, and a coating layer containing pores is formed on the outer layer of the catalyst core of the prepared layered perovskite type catalyst, so that the catalytic efficiency of the catalyst is ensured, and the catalyst has good SO2, H2O and alkali metal poisoning resistance.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and more specifically relates to a layered perovskite catalyst composite method and a composite catalyst. Background technique [0002] Perovskite-type composite oxide is a type of catalyst with excellent treatment effects on flue gas containing organic pollutants (VOCs), dioxins (PCDD / Fs) and CO. The above pollutants have certain reducibility. Perovskite Mineral-type composite oxides can efficiently degrade the above pollutants through catalytic combustion. However, flue gas generally contains a large amount of SO 2 、H 2 O and alkali metals (potassium, sodium) and other substances, perovskite-type composite oxides are easily affected by these substances, causing poisoning, and thus losing their degradation activity. How to improve the water resistance, sulfur resistance and alkali metal resistance of perovskite composite oxides has become a limiting factor for the application of perovskite ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J35/02B01J35/08B01J33/00F23G7/07
CPCB01J23/002B01J23/34B01J35/0086B01J35/08B01J35/023B01J33/00F23G7/07B01J2523/00F23G2209/14F23G2209/142B01J2523/3712B01J2523/41B01J2523/47B01J2523/72
Inventor 钱立新龙红明丁龙顾明言徐辉魏进超杨本涛王光应陈萍
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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