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Nano iron-zirconium composite catalyst and preparation method thereof

A composite catalyst, nano-iron technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low activity, easy mixing and unevenness, and achieve uniform dispersion of elements, clear process, and improved The effect of thermal stability

Active Publication Date: 2018-11-16
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it also has certain shortcomings, such as its low activity in the low temperature section, and the coprecipitation method is easy to mix unevenly

Method used

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  • Nano iron-zirconium composite catalyst and preparation method thereof
  • Nano iron-zirconium composite catalyst and preparation method thereof
  • Nano iron-zirconium composite catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of iron-based catalyst

[0028] 1) Dissolve 0.484g ferric nitrate in 20ml deionized water, and disperse evenly by ultrasonic. Obtaining ferric nitrate concentration is 0.1mol / L mixture A1;

[0029] 2) Add the mixture A1 obtained in step 1) into a 15mL NaOH solution with a concentration of 2mol / L, and stir for 30min to obtain the mixture B1;

[0030] 3) The mixture B1 obtained in step 2) was statically aged for 24 hours, and then placed in a 50ml polytetrafluoroethylene reactor for hydrothermal reaction for 24 hours. The hydrothermal temperature was 170°C. After the reaction was completed, it was naturally cooled to room temperature to obtain mixture C1;

[0031] 4) Wash the mixture C1 obtained in step 3) with water and alcohol for 3 times, and then dry at 60°C; obtain the iron-based catalyst ( figure 1 ).

Embodiment 2

[0033] Preparation of Nano-hexagonal Fe-Zr Composite Catalyst

[0034] 1) Dissolve 0.4356g of ferric nitrate and 0.08586g of zirconium nitrate in 20ml of deionized water, and disperse evenly by ultrasonic. The sum of the concentrations of the two salt solutions obtained is 0.1mol / L mixture A2;

[0035] 2) Add the mixture A2 obtained in step 1) into a 15mL NaOH solution with a concentration of 2mol / L, and stir for 30min to obtain a mixture B2;

[0036] 3) The mixture B2 obtained in step 2) was statically aged for 24 hours, and then placed in a 50ml polytetrafluoroethylene reactor for hydrothermal reaction for 24 hours. The hydrothermal temperature was 170°C. After the reaction was completed, it was naturally cooled to room temperature to obtain mixture C2;

[0037] 4) After the mixture C2 obtained in step 3) is washed with water and washed with alcohol for 3 times, it is dried at 60°C; the nano-hexagonal iron-zirconium composite catalyst ( figure 2 ).

Embodiment 3

[0039] Preparation of nano-rod iron-zirconium composite catalyst

[0040] 1) Dissolve 0.4356g of ferric nitrate and 0.08586g of zirconium nitrate in 20ml of deionized water, and disperse evenly by ultrasonic. The sum of the concentration of the two salt solutions obtained is 0.1mol / L mixture A3;

[0041] 2) Add the mixture A3 obtained in step 1) into a 15mL NaOH solution with a concentration of 2mol / L, and stir for 30min to obtain a mixture B3;

[0042] 3) The mixture B3 obtained in step 2) was statically aged for 72 hours, and then placed in a 50ml polytetrafluoroethylene reactor for hydrothermal reaction for 24 hours. The hydrothermal temperature was 170°C. After the reaction was completed, it was naturally cooled to room temperature to obtain mixture C3;

[0043] 4) Wash the mixture C3 obtained in step 3) with water and alcohol for 3 times, and then dry at 60° C.; obtain nanorod-shaped iron-zirconium composite catalyst ( image 3 ).

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Abstract

The invention aims to provide a nano iron-zirconium composite catalyst and a preparation method thereof. Ferric nitrate and zirconium nitrate are dissolved in deionized water, so that a mixture A is obtained, wherein the sum of the concentration of the ferric nitrate and the concentration of the zirconium nitrate is 0.1-0.5 mol / L, and the molar ratio of Fe to Zr is 9:1-5:5; the mixture A is addedinto a NaOH solution with a concentration of 0.5-2 mol / L, and stirring is carried out, so that a mixture B is obtained, wherein the volume ratio of the mixture A to the NaOH solution is 4:3; and standing is carried out on the mixture B for aging, then the aged mixture B is placed in a reaction kettle, a hydrothermal reaction is carried out at a hydrothermal temperature of 130-170 DEG C for 12-48 hours, and natural cooling is carried out to room temperature, so that the mixture C is obtained. According to the invention, the denitration activity is improved, the thermal stability of the catalystis enhanced, and the optimal denitration efficiency of the catalyst in a denitration process is improved.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a preparation method of a nano-iron-zirconium composite catalyst. Background technique [0002] my country's energy structure is dominated by coal, and dust, SO2, and NOx are the main sources of pollution. Among them, NOx can cause environmental problems such as acid rain and photochemical smog, and cause great harm to the ecological environment and human health. Therefore, how to effectively control the emission of NOx has become a very important issue at present. At present, in the flue gas denitrification technology, the more effective method is NH3-SCR, and the V2O5-WoO3 / TiO2 catalyst system is the most widely used. The environment is polluted. For this reason, people continue to deepen the research on denitrification catalyst technology in order to find a denitrification catalyst with high efficiency, environmental protection, simple preparation method and industrializat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J37/10B01D53/86B01D53/56
CPCB01D53/8628B01D2251/2062B01J23/745B01J37/10
Inventor 杨剑刘兰田园梦刘清才任山黎江玲赵齐李书兰
Owner CHONGQING UNIV
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