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Preparation method and application of hydrotalcite-based NiMnTi catalyst

A hydrotalcite-based, catalyst technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problem of high working temperature, achieve good thermal stability, high N2 selectivity, The effect of large specific surface area

Active Publication Date: 2018-12-14
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Selective catalytic reduction of ammonia (NH 3 -SCR) is widely used as an effective flue gas denitrification technology. However, the working temperature of the vanadium-titanium catalyst used in conjunction with it is relatively high (300-400°C), which cannot well meet the needs of working conditions such as low temperature and wide working temperature window. Therefore, the development of low-temperature denitration catalysts with a wide operating temperature window has become a research hotspot.

Method used

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  • Preparation method and application of hydrotalcite-based NiMnTi catalyst
  • Preparation method and application of hydrotalcite-based NiMnTi catalyst
  • Preparation method and application of hydrotalcite-based NiMnTi catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: c(Ni 2+ ) : c(Mn 2+ ) : c(Ti 4+ ) =3:1:1

[0034] (1) Synthesis of NiMnTi-LDH precursor: Weigh 1.134 g Ni(NO 3 ) 2` 6H 2 O, 1.105 g urea, 0.458 ml butyl titanate, 0.303 ml Mn(NO 3 ) 2 (mass fraction is 50%) dissolved in 100 ml of distilled water, transfer the mixture to a 500 ml round bottom flask, add 3±0.5 ml absolute ethanol dropwise in the round bottom flask with a rubber dropper, and put the round bottom flask Put it into an oil bath magnetic stirring pot, dissolve at 90 °C for 4 h, adjust the temperature of the oil bath to 100 °C, nucleate and crystallize for 48 h, and obtain a turbid solution with a pH value of 7.6. After cooling down to room temperature, the obtained solution was filtered and washed until neutral, and dried overnight in an oven at 60±5° C. to obtain a NiMnTi-LDH precursor.

[0035] (2) Carry out X-ray diffraction analysis on the prepared crystal fine powder product, and its diffraction spectrum is as attached figure 1 shown. ...

Embodiment 2

[0040] Example 2: c(Ni 2+ ) : c(Mn 2+ ) : c(Ti 4+ ) =2:2:1

[0041] (1) Synthesis of NiMnTi-LDH precursor: weigh 1.890 g Ni(NO 3 ) 2` 6H 2 O, 1.500 g urea, measure 1.1±0.2 ml butyl titanate with a graduated cylinder, 1.145 ml Mn(NO 3 ) 2 (Mass fraction is 50%) dissolved in 250 ml of distilled water, transfer the mixture to a 500 ml round bottom flask, add 8 ± 0.5 ml absolute ethanol dropwise in the round bottom flask with a rubber dropper, and put the round bottom flask Put it into an oil bath magnetic stirring pot, dissolve at 90 °C for 12 h, adjust the temperature of the oil bath to 100 °C, and nucleate and crystallize for 24 h to obtain a turbid solution with a pH value of 8.2. After cooling down to room temperature, the resulting solution was filtered and washed with water until neutral, and dried overnight in an oven at 60±5°C to obtain a NiMnTi-LDH precursor.

[0042] (2) Carry out X-ray diffraction analysis on the prepared crystal fine powder product, and its di...

Embodiment 3

[0048] Example 3: c(Ni 2+ ) : c(Mn 2+ ) : c(Ti 4+ ) =3:2:1

[0049] (1) Synthesis of NiMnTi-LDH precursor: Weigh 2.269 g Ni(NO 3 ) 2` 6H 2 O, 2.763 g urea, pipette 1.145 ml butyl titanate, and measure 1.213 ml Mn(NO 3 ) 2 (Mass fraction is 50%) dissolved in 340ml distilled water, transfer the mixed solution to a 500 ml round bottom flask, add 10±0.5ml absolute ethanol dropwise in the round bottom flask with a rubber dropper, put the round bottom flask Put it into an oil bath magnetic stirring pot, dissolve at 90 °C for 8 h, adjust the temperature of the oil bath to 100 °C, and nucleate and crystallize for 12 h to obtain a turbid solution, the pH of which is 8.0. After cooling down to room temperature, the resulting solution was filtered and washed with water until neutral, and dried overnight in an oven at 60±5°C to obtain a NiMnTi-LDH precursor.

[0050] (2) Carry out X-ray diffraction analysis on the prepared crystal fine powder product, and its diffraction spectrum ...

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Abstract

The invention discloses a preparation method and application of a hydrotalcite-based NiMnTi catalyst. The preparation method adopts nickel nitrate hexahydrate, a butyl titanate solution and a manganese nitrate solution with a mass fraction of 50% as raw materials and urea as a precipitant, synergistically exerts the advantages of Ni, Mn and Ti as the cut-in point and utilizes the preparation of NiMnTi-like hydrotalcite to effectively assemble Ni, Mn and Ti in situ. The preparation method comprises: dissolving the raw materials and a precipitant in distilled water, adding ethanol into the solution to obtain a mixed solution, carrying out reflux condensation on the mixed solution in an oil bath, carrying out cooling, suction filtration, washing, drying and grinding to obtain a NiMnTi-like hydrotalcite precursor, and calcining the NiMnTi-like hydrotalcite precursor to obtain the NiMnTi composite oxide catalyst. The NiMnTi composite oxide catalyst has good catalytic activity in the NH3-SCRreaction (with an NOx removal rate of 90% or more at 150-360 DEG C), high N2 selectivity and excellent water and sulfur resistance.

Description

technical field [0001] The invention relates to a preparation method and application of a hydrotalcite-based NiMnTi catalyst, belonging to the field of gas purification and denitration catalyst preparation. Background technique [0002] Nitrogen oxides (NO x ) is one of the main pollutants in the atmospheric environment, which will cause great harm to human health and the ecological environment. With the enhancement of people's awareness of environmental protection and the increasingly stringent regulations and policies, the efficient removal and emission reduction of nitrogen oxides has been put on the agenda of environmental protection departments and production units. Selective catalytic reduction of ammonia (NH 3 -SCR) is widely used as an effective flue gas denitrification technology. However, the working temperature of the vanadium-titanium catalyst used in conjunction with it is relatively high (300-400°C), which cannot well meet the needs of working conditions such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J35/10B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/8892B01J2523/00B01J35/60B01J2523/47B01J2523/72B01J2523/847
Inventor 吴旭李晓建邹春蕾王若男侯本辉
Owner TAIYUAN UNIV OF TECH
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