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Method for preparing bimetallic denitration catalyst by using coal ash

A denitration catalyst, fly ash technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of insufficient comprehensive utilization of fly ash and the cost of denitration catalysts Advanced problems, to achieve significant economic benefits, easy control of process conditions, saving raw materials

Inactive Publication Date: 2013-01-09
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing bimetallic denitrification catalysts by using fly ash, which is used to solve the problems of high cost of existing denitrification catalysts and insufficient comprehensive utilization of fly ash

Method used

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  • Method for preparing bimetallic denitration catalyst by using coal ash

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Embodiment 1

[0027] combine figure 1 As shown, the method of using fly ash to prepare bimetallic denitrification catalyst: collect fly ash from the site, grind it into fine powder, pass through a 200-mesh sieve, take 100g of fine powder and place it in a muffle furnace. After calcination at high temperature for 6 hours, wash with water 3 times at a temperature of 45°C and a speed of 200r / min, 2 hours each time, then separate the washing liquid from the fly ash for solid-liquid separation, and dry the solid at 120°C for 5 hours after separation; Ash and Na 2 CO 3 The solid mass ratio is 1:0.8 and mixed evenly. After roasting at 800°C for 1 hour, take it out to 25°C for later use; then impregnate the roasted product with 6.4mol / L HCl for 1 hour, filter to remove insoluble matter, and obtain silica-rich gel and crude AlCl 3 solution.

[0028] The crude AlCl prepared above 3 Adjust the pH value of the solution to 6, filter and wash the resulting precipitate, then continue to drop NaOH to dis...

Embodiment 2

[0033] This method of using fly ash to prepare bimetallic denitration catalysts: collect fly ash on site, grind it into fine powder, pass through a 200-mesh sieve, take 100g of fine powder and place it in a muffle furnace, and calcinate it at 900°C for 10 hours , at a temperature of 45°C and a rotational speed of 300r / min, wash with water three times, each time for 3 hours, then separate the washing liquid from the fly ash solid-liquid, and dry the separated solid at 120°C for 5 hours for later use; fly ash and Na 2 CO 3 The mass ratio of solids is 1:1.5, mixed evenly, roasted at 880°C for 1.5h, then taken out to 25°C for use; then impregnated the roasted product with 7.2mol / L HCl for 2.5h, filtered to remove insoluble matter, and obtained silica-rich gel and Crude AlCl 3 solution.

[0034] The crude AlCl prepared above 3 Adjust the pH value of the solution to 6, filter and wash the resulting precipitate, then continue to drop NaOH to dissolve the precipitate until the pH i...

Embodiment 3

[0039] This method of using fly ash to prepare a bimetallic denitrification catalyst: collect fly ash from the site, grind it into a fine powder, pass through a 200-mesh sieve, take 100g of the fine powder and place it in a muffle furnace, and calcinate it at 600°C for 8 hours Finally, wash once with water at a temperature of 20°C and a rotational speed of 100r / min, 4 hours each time, then separate the washing liquid from the fly ash for solid-liquid separation, and dry the solid at 120°C for 5 hours after separation; fly ash and Na 2 CO 3 The mass ratio of solids is 1:0.4, mixed evenly, roasted at 750°C for 2 hours, then taken out to 25°C for later use; then impregnated the roasted product with 2mol / L HCl for 3 hours, filtered, and removed the insoluble matter to obtain silica-rich gel and crude AlCl 3 solution. Crude AlCl 3 The pH value of the solution is adjusted to 4, the precipitate generated is filtered and washed, and then NaOH is continued to be added dropwise to dis...

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Abstract

The invention relates to a method for preparing a bimetallic denitration catalyst by using coal ash. The method includes firstly, using the coal ash to prepare a coarse AlCl3 solution; secondly, using the coarse AlCl3 solution to prepare pseudo boehmite; thirdly, subjecting the obtained pseudo boehmite to high-temperature roasting at the temperature of 400-700 DEG C to obtain gamma-Al2O3, adding hydrogen nitrate to the pseudo boehmite and the gamma-Al2O3 to be evenly mixed, and crushing the pseudo boehmite and the gamma-Al2O3 into required shapes and sizes according to requirements after extrusion molding; fourthly, using Ce salt and Mg salt to prepare a stable mixed solution with mass percentage concentration of 1%-20%; and fifthly, immersing the gamma-Al2O3 obtained from the second step in the mixed solution prepared in the fourth step for 20-30 hours, draining the residual solution in a molecular sieve after the immersion is finished, and subjecting the drained residual solution to drying for 24 hours at room temperatures and then roasting at the temperature of 500-850 DEG C to obtain bimetallic denitration catalyst particles. Compared with existing denitration catalysts, the bimetallic denitration catalyst has the advantages that the specific area is larger, the thermal stability is better, and the conversion percentage of NOx reaches 60%-90%.

Description

1. Technical field: [0001] The invention relates to the fields of industrial waste gas treatment and environmental protection catalytic materials, in particular to a method for preparing a bimetallic denitrification catalyst using fly ash. 2. Background technology: [0002] In recent years, with the continuous increase of industrial coal consumption, the emission of fly ash has increased sharply. According to statistics, in 2010, my country's fly ash discharge was about 300 million tons, and the comprehensive utilization rate was less than 40%. The ecological environment has a huge negative impact. How to use the chemical composition in fly ash (Al 2 o 3 ), realizing resource and high-value utilization of fly ash is not only a direction for the future development of fly ash, but also an important content in the development of circular economy in my country. [0003] Nitrogen oxides (NO x ) is one of the main pollutants in the atmosphere. It easily forms nitric acid rain ...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J23/83C01F7/14B01D53/86B01D53/56
Inventor 陈彦广陆佳赵中堂马倩李金莲李改海
Owner NORTHEAST GASOLINEEUM UNIV
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