Catalyst capable of reducing carbon monoxide content in cigarette smoke, preparation method and application of same

A technology for carbon monoxide and cigarette smoke, applied in the fields of application, tobacco, and tobacco treatment, to achieve the effects of reducing carbon monoxide content, convenient operation, and low metal content

Active Publication Date: 2009-12-30
CHINA TOBACCO HUNAN INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the preparation of mesoporous metal alumina catalysts with surface basicity and its use in reducing harmful substances such as carbon monoxide in cigarette smoke have not been reported yet.

Method used

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  • Catalyst capable of reducing carbon monoxide content in cigarette smoke, preparation method and application of same
  • Catalyst capable of reducing carbon monoxide content in cigarette smoke, preparation method and application of same
  • Catalyst capable of reducing carbon monoxide content in cigarette smoke, preparation method and application of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Carrier meso-Al 2 o 3 Synthesis of -a: 6.078g template agent P123 (EO 20 PO 70 EO 20 ) with 0.060g LaCl 3 Dissolve them together in 25ml of sec-butanol, and add 5.4ml of aluminum sec-butoxide under stirring. After stirring at room temperature for 1 h, the mixture of water and sec-butanol (1.14mlH 2 0 / 10mlsec-butanol) slowly dropwise into it, and the mixture consists of:

[0042] 0.01La 3+ :1.0Al(Bu s O) 3 :0.10EO 20 PO 70 EO 20 :3.0H 2 O:15.5Bu s Oh. The mixture was stirred at 45°C for 48 hours, filtered, dried, and calcined at 500°C for 6h in an air atmosphere to obtain the product, marked as meso-Al 2 o 3 -a. With low temperature N 2 Determination of meso-Al by adsorption-desorption method 2 o 3 - The specific surface of a is 325m 2 / g, the pore volume is 0.93cm 3 / g, the average pore diameter is 7.5nm; with CO 2 Temperature programmed desorption (CO 2 -TPD) method to measure its surface basicity is 0.0369mmol[OH - ] / g; the isoelectric point I...

Embodiment 2

[0046] Deposition-precipitation method (DP) prepares, with the meso-Al prepared in example 1 2 o 3 -a as carrier, with Na 2 CO 3 As precipitant, HAuCl 4 The solution (concentration is 9.71mmol / L) was adjusted to pH=7, under vigorous stirring, 1.0g carrier meso-Al 2 o 3 -a was added to it, reacted for 4h, filtered, washed with hot water (70-80°C) several times, and AgNO 3 (0.10mol / L) detected no Cl - , Dry at 70°C for 10h. Then calcined at 350°C for 1.0h, cooled to room temperature, and then reduced with hydrogen at 300°C for 1.0h to obtain the catalyst Au / meso-Al 2 o 3 -a(DP). With low temperature N 2 Determination of Au / meso-Al by Adsorption-Desorption Method 2 o 3 -a(DP) has a specific surface area of ​​209m 2 / g, the pore volume is 0.45cm 3 / g, the average pore diameter is 4.7nm; the average size of nano-Au particles on the surface of the carrier is 4.9nm.

[0047] Catalyst Au / meso-Al 2 o 3 -a(DP) tableting and sieving, selecting 40-60 mesh particles and di...

Embodiment 3

[0049] Prepared by anion exchange method (DAE), using the meso-Al2O3-a prepared in Example 1 as a carrier, mix the HAuCl4 solution with a concentration of 9.71mmol / L and 1.0g carrier evenly, and stir at room temperature for 1.5h. Filter, wash three times with ammonia water (20% V / V), and then wash with water several times until no Cl is detected by AgNO3 (0.10mol / L) - . Dry at 70°C for 10h, calcinate at 350°C for 1.0h, cool to room temperature, and then reduce with hydrogen at 300°C for 1.0h. to obtain the catalyst Au / meso-Al 2 o 3 -a(DAE). With low temperature N 2 Determination of Au / meso-Al by Adsorption-Desorption Method 2 o 3 - The specific surface of a(DAE) is 300m 2 / g, the pore volume is 0.87cm 3 / g, the average pore diameter is 6.7nm; the average size of nano-Au particles on the surface of the carrier is 3.9nm.

[0050]Catalyst Au / meso-Al 2 o 3 -a (DAE) tableting and sieving, select 40-60 mesh particles and disperse them in the cellulose acetate tow to make b...

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PUM

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Abstract

The invention belongs to the field of harm and tar reduction of cigarettes, and relates to a catalyst capable of reducing carbon monoxide content in cigarette smoke at normal temperature, and a preparation method and the application of the same. The method comprises the following steps that: directing agents with different structures are synthesized into mesoporous alumina with a high specific surface and a plurality of surface basic sites as a carrier of the catalyst, and nanometer metal catalytic active components are highly dispersed on the surface of the carrier by adopting different methods, such as a homogeneous deposition-precipitation method, a deposition-precipitation method, an ion exchange method and the like to prepare a mesoporous metal alumina catalyst. The specific surface of the catalyst is 100 to 400 m<2> / g; a pore size is 2.0 to 10.0 nm; the surface basicity of the mesoporous metal alumina catalyst is 0.01 to 0.08 mmol / g; pH of a surface isoelectric point (an IEP value) is 8 to 10; and the catalytic active components are nanometer metal. The catalyst of the invention can oxidate carbon monoxide to carbon dioxide completely at normal temperature and can selectively reduce the carbon monoxide content in the cigarette smoke by 10 to 30 percent when the catalyst is added to a filter candle of the cigarette.

Description

technical field [0001] The invention belongs to the field of cigarette harm reduction and coke reduction, and specifically relates to a catalyst capable of reducing the carbon monoxide content of cigarette smoke at normal temperature, a preparation method and application thereof. Background technique [0002] The study found that the main harmful substances in cigarette smoke include: carbon monoxide, nitrogen oxides, acrolein, volatile aromatic hydrocarbons, hydrocyanic acid, volatile nitrosamines, etc. in the gas phase of smoke; Polycyclic aromatic hydrocarbons, phenols, nicotine, nitrosamines (especially tobacco-specific nitrosamines), some heterocyclic compounds and trace radioactive elements, etc.; and free radicals that exist in both the gas phase and the particle phase. Among them, the content of CO and cigarette tar in the gas phase of the smoke is the highest, so it is also the most harmful to the human body. Once inhaled, it will combine with hemoglobin, and its af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A24B15/28A24D3/16
Inventor 银董红刘建福秦亮生
Owner CHINA TOBACCO HUNAN INDAL CORP
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