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Ferronickel compound oxide catalyst and preparation method and application thereof

A composite oxide and catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., to achieve strong water and sulfur resistance, high N2 selectivity, The effect of promoting dispersion

Inactive Publication Date: 2018-12-07
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, relatively poor NH 3 -SCR catalytic activity is the main restriction factor for its popularization and application

Method used

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  • Ferronickel compound oxide catalyst and preparation method and application thereof
  • Ferronickel compound oxide catalyst and preparation method and application thereof
  • Ferronickel compound oxide catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Weigh 0.19 g of nickel nitrate hexahydrate, 0.13 g of ferric nitrate nonahydrate, 0.045 g of urea, and 0.005 g of sodium citrate, dissolve them in 40ml of distilled water, and stir with a magnetic stirrer for 10 minutes to completely dissolve until the solution is clear.

[0031] (2) The mixed solution obtained in (1) was sealed and placed in a polytetrafluoroethylene-lined stainless steel reactor, and hydrothermally treated in an oven at 120 °C for 12 h, and the pH value of the solution was 7.6.

[0032] (3) After the reaction kettle is naturally cooled, filter the reacted solution to get the precipitate, wash it with deionized water several times until neutral, put it in an oven and dry it at 80 °C for 12 h, take it out and grind it Sieve to obtain the NiFe-LDH precursor.

[0033] (4) Put the NiFe-LDH precursor in the crucible, put it into the muffle furnace, set the heating process (heating rate 2 ℃ / min) from room temperature to 400 ℃, calcined at 400 ℃ for 3 hou...

Embodiment 2

[0039] (1) Weigh 0.23 g of nickel nitrate hexahydrate, 0.081 g of ferric nitrate nonahydrate, 0.043 g of urea, and 0.003 g of sodium citrate, dissolve them in 40ml of distilled water, and stir with a magnetic stirrer for 10 minutes to completely dissolve until the solution is clear.

[0040] (2) The mixed solution obtained in (1) was sealed and placed in a polytetrafluoroethylene-lined stainless steel reactor, and hydrothermally treated in an oven at 120 °C for 12 h, and the pH of the solution was 7.3.

[0041] (3) After the reaction kettle is naturally cooled, filter the reacted solution to get the precipitate, wash it with deionized water several times until it becomes neutral, put it in an oven and dry it for 12 hours at 80 °C, take it out and grind it to sieve , namely the NiFe-LDH precursor.

[0042] (4) Put the NiFe-LDH precursor in the crucible, put it into the muffle furnace, set the heating process (heating rate is 2°C / min) from room temperature to 500°C, and calcinat...

Embodiment 3

[0049] (1) Weigh 0.25 g of nickel nitrate hexahydrate, 0.058 g of ferric nitrate nonahydrate, 0.042 g of urea, and 0.002 g of sodium citrate, dissolve them in 40 ml of distilled water, and stir with a magnetic stirrer for 10 minutes to completely dissolve until the solution is clear.

[0050] (2) The mixed solution obtained in (1) was sealed and placed in a polytetrafluoroethylene-lined stainless steel reactor, and hydrothermally treated in an oven at 120 °C for 12 h, and the pH of the solution was 6.8.

[0051] (3) After the reaction kettle is naturally cooled, filter the reacted solution to get the precipitate, wash it with deionized water several times until it becomes neutral, put it in an oven and dry it for 12 hours at 80 °C, take it out and grind it to sieve , namely the NiFe-LDH precursor.

[0052] (4) Put the NiFe-LDH precursor in the crucible, put it into the muffle furnace, set the heating process (heating rate is 2°C / min) from room temperature to 600°C, and calcina...

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Abstract

The invention discloses a ferronickel compound oxide catalyst and a preparation method and an application thereof and belongs to the technical field of atmospheric pollution control. The preparation method comprises the following steps: by taking nickel nitrate hexahydrate and iron nitrate nonahydrate as raw materials, urea as a precipitant, sodium citrate as a complexing agent, deionized water asa solvent and a detergent, carrying out solution preparation, hydro-thermal treatment, sample washing, drying and the like to prepare a NiFe-LDH precursor; and roasting NiFe-LDH to obtain a ferronickel compound oxide (NiFe-LDO) catalyst. By applying the catalyst to an ammonia gas selective catalytic reduction (NH3-SCR) denitration experiment, a result verifies that the prepared NiFe-LDO catalysthas catalytic activity over 85% at a window of 210-360 DEG C, N2 selectivity close to 95% and water resistance and sulfur resistance.

Description

technical field [0001] The invention relates to a nickel-iron composite oxide catalyst and its preparation method and application, belonging to the technical field of air pollution control. Background technique [0002] Nitrogen oxides (NO x ) is the main cause of acid rain, greenhouse effect, and photochemical smog, causing serious harm to human health and the living environment. With the enhancement of people's awareness of environmental protection and the increasingly stringent regulations and policies, NO x The elimination of environmental protection has become an important topic in the field of environmental protection. NH 3 -SCR technology is the most popular and efficient denitrification technology at home and abroad. The core of its wide application is the preparation of suitable catalysts under operating conditions. Therefore, the development of new catalyst systems is still a research hotspot in the field of denitrification. [0003] Ni-based oxide catalysts h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/755B01J2523/00B01J2523/22B01J2523/31B01J2523/842B01J2523/847
Inventor 吴旭王若男李晓建邹春蕾刘雪贞
Owner TAIYUAN UNIV OF TECH
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