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Preparation method of hydrotalcite-based CoNiV composite oxide catalyst and escape ammonia removal application

A composite oxide, hydrotalcite-based technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as low temperature activity to be improved

Pending Publication Date: 2022-05-31
JINZHONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many single transition metal oxide catalysts for low temperature NH 3 -SCO performance evaluation shows: cobalt-based oxides have outstanding low-temperature catalytic activity, unfortunately, N 2 O is its low temperature NH 3 The main product of the oxidation reaction; vanadium-based oxides exhibit excellent N 2 Selectivity, but its low temperature activity needs to be improved

Method used

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  • Preparation method of hydrotalcite-based CoNiV composite oxide catalyst and escape ammonia removal application
  • Preparation method of hydrotalcite-based CoNiV composite oxide catalyst and escape ammonia removal application
  • Preparation method of hydrotalcite-based CoNiV composite oxide catalyst and escape ammonia removal application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1: c(Co 2+ ):c(Ni 2+ ):c(V 3+ ) =1:2:1

[0044] (1) Weigh 2.379 g of cobalt chloride hexahydrate, 1.573 g of vanadium chloride, and 4.753 g of nickel chloride hexahydrate into a beaker, add 100 ml of deionized water, and stir with a magnetic stirrer for 20 min to dissolve them completely. use;

[0045] (2) Add 10.82 g of urea to the mixed salt solution prepared above to dissolve it and stir evenly.

[0046] (3) Continue to stir the mixed solution obtained in (2) for 30 min with a magnetic stirrer, and measure the pH value of the mixed solution with a pH meter.

[0047] (4) Then the obtained mixed solution was sealed and placed in a polytetrafluoroethylene-lined stainless steel reactor, and hydrothermally treated in an oven at 110±2 °C for 12 h.

[0048] (5) 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 to dry at 60±2°C for 12 hour...

Embodiment 2

[0051] Example 2: c(Co 2+ ):c(Ni 2+ ):c(V 3+ ) =1.5:1.5:1

[0052] (1) Weigh 3.569 g of cobalt chloride hexahydrate, 1.573 g of vanadium chloride, and 3.565 g of nickel chloride hexahydrate into a beaker, add 100 ml of deionized water, and stir with a magnetic stirrer for 20 min to dissolve completely. use;

[0053] (2) Add 10.82 g of urea to the mixed salt solution prepared above to dissolve it and stir evenly.

[0054] (3) Continue to stir the mixed solution obtained in (2) for 30 min with a magnetic stirrer, and measure the pH value of the mixed solution with a pH meter.

[0055] (4) Then the obtained mixed solution was sealed and placed in a polytetrafluoroethylene-lined stainless steel reactor, and hydrothermally treated in an oven at 110±2 °C for 12 h.

[0056] (5) 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 to dry at 60±2°C for 12 hours...

Embodiment 3

[0059] Example 3: c(Co 2+ ):c(Ni 2+ ):c(V 3+ ) =2:1:1

[0060] (1) Weigh 4.759 g of cobalt chloride hexahydrate, 1.573 g of vanadium chloride, and 2.377 g of nickel chloride hexahydrate into a beaker, add 100ml of deionized water, and stir with a magnetic stirrer for 20 minutes to dissolve completely, and set aside ;

[0061] (2) Add 10.82 g of urea to the mixed salt solution prepared above to dissolve it and stir evenly.

[0062] (3) Continue to stir the mixed solution obtained in (2) for 30 min with a magnetic stirrer, and measure the pH value of the mixed solution with a pH meter.

[0063] (4) Then the obtained mixed solution was sealed and placed in a polytetrafluoroethylene-lined stainless steel reactor, and hydrothermally treated in an oven at 110±2 °C for 12 h.

[0064] (5) 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 to dry at 60±2°C fo...

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Abstract

The invention discloses a preparation method of a hydrotalcite-based CoNiV composite oxide catalyst and an escape ammonia removal application, and belongs to the field of catalyst preparation and application. The preparation method comprises the following steps: by taking cobalt chloride hexahydrate, vanadium chloride and nickel chloride hexahydrate as raw materials, urea as a precipitator and deionized water as a solvent and a detergent, preparing a solution, uniformly stirring, carrying out hydrothermal treatment, carrying out suction filtration, washing and drying to prepare a cobalt-nickel-vanadium hydrotalcite precursor; and roasting the cobalt-nickel-vanadium hydrotalcite precursor at a certain temperature to obtain the catalyst for removing escaping ammonia from the CoNiV composite oxide. The CoNiV composite oxide catalyst prepared by the method disclosed by the invention is applied to low-temperature selective catalytic oxidation escape ammonia (NH3-SCO) reaction and shows good catalytic activity (NH3 conversion rate at 150-360 DEG C reaches 90% or above) and high N2 selectivity.

Description

technical field [0001] The invention specifically relates to a preparation method of a hydrotalcite-based CoNiV composite oxide catalyst and an application for removing ammonia escape, and belongs to the field of catalyst preparation and application. Background technique [0002] With low temperature NH 3 - With the rapid development of SCR technology, it is of great significance to develop a slip ammonia removal catalyst that matches the actual denitrification conditions. Ammonia Selective Catalytic Oxidation (NH 3 -SCO) technology can selectively oxidize ammonia to N 2 and H 2 O, easy to operate, NH 3 It is an effective treatment technology with high removal rate and rapid response. However, many metal oxide catalysts suffer from uncoordinated low-temperature NH 3 Oxidation activity and N 2 Selectivity becomes the key to restrict its application. Therefore, the development of low temperature activity is good, N 2 NH with high selectivity 3 -SCO catalysts are crit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/847B01J35/02B01D53/86B01D53/58B01J35/00
CPCB01J23/002B01J23/8472B01D53/8634B01J2523/00B01J35/50B01J35/40B01J2523/55B01J2523/845B01J2523/847
Inventor 杜亚丽吴旭马荣刘雪贞武鲜凤
Owner JINZHONG UNIV
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