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Pd triple-effect low-temperature catalyst taking nitrogen-doped titanium dioxide as carrier as well as preparation method and application thereof

The technology of titanium dioxide and catalyst is applied in the field of Pd three-effect low-temperature catalyst and its preparation, which can solve the problems of low selectivity, and achieve the effects of reducing reaction temperature, improving performance, and being beneficial to popularization and application.

Active Publication Date: 2018-11-02
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the deficiency of pure thermal catalysis to remove CO / NO, improve the low-temperature activity of the catalyst and the 2 selectivity, and provide a Pd three-effect low-temperature catalyst with nitrogen-doped titanium dioxide as a carrier and its preparation method and application. It uses photothermal coupling to improve the Pd catalyst by loading Pd on nitrogen-doped titanium dioxide. The performance of catalytic removal of CO / NO solves the problem that conventional Pd catalysts and simple supports need to catalyze the CO / NO reaction and N at a higher temperature. 2 The problem of low selectivity, and the preparation method of the catalyst is simple and easy, which is conducive to popularization and application

Method used

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  • Pd triple-effect low-temperature catalyst taking nitrogen-doped titanium dioxide as carrier as well as preparation method and application thereof
  • Pd triple-effect low-temperature catalyst taking nitrogen-doped titanium dioxide as carrier as well as preparation method and application thereof
  • Pd triple-effect low-temperature catalyst taking nitrogen-doped titanium dioxide as carrier as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] 1 wt% Pd / N-TiO 2 The preparation of catalyst, concrete steps are:

[0028] 1) In an ice-water bath, quickly add 25ml of isopropyl titanate to 100ml of ammonia solution as a precursor, stir rapidly for 6h, wash with water, dry in an oven at 80°C, and then calcinate to obtain light yellow N-TiO 2 carrier;

[0029] 2) In the resulting 1.2g N-TiO 2 Add 10 mL of PdCl with a concentration of 1.2 mg / mL to the carrier 2 Solution and 100mL deionized water, stirred for 3h, adjusted the pH value of the solution to about 10, and then slowly added NaBH with a concentration of 0.1mol / L 4 Mixed solution with NaOH to excess, so that Pd is completely reduced, stirred at room temperature for 6 hours, centrifuged, washed with deionized water until the ion concentration is lower than 10ppm, and dried in an oven at 80°C to obtain the supported Pd / N-TiO 2 catalyst.

[0030] figure 1 For the resulting Pd / N-TiO 2 Scanning electron microscope image of the catalyst. from figure 1 It can...

Embodiment 2

[0045] 0.5 wt% Pd / N-TiO 2 The preparation of catalyst, concrete steps are:

[0046] 1) In an ice-water bath, quickly add 25ml of isopropyl titanate to 100ml of ammonia solution as a precursor, stir rapidly for 6h, wash with water, dry in an oven at 80°C, and then calcinate to obtain light yellow N-TiO 2 carrier;

[0047] 2) In the resulting 1.2g N-TiO 2 Add 5 mL of 1.2 mg / mL PdCl to the carrier 2 Solution and 100mL deionized water, stirred for 3h, adjusted the pH value of the solution to about 10, and then slowly added NaBH with a concentration of 0.1mol / L 4 Mixed solution with NaOH to excess, so that Pd is completely reduced, stirred at room temperature for 6 hours, centrifuged, washed with deionized water until the ion concentration is lower than 10ppm, and dried in an oven at 80°C to obtain the supported Pd / N-TiO 2 catalyst.

Embodiment 3

[0049] 2.5 wt% Pd / N-TiO 2 The preparation of catalyst, concrete steps are:

[0050] 1) In an ice-water bath, quickly add 25ml of isopropyl titanate to 100ml of ammonia solution as a precursor, stir rapidly for 6h, wash with water, dry in an oven at 80°C, and then calcinate to obtain light yellow N-TiO 2 carrier;

[0051] 2) In the resulting 1.2g N-TiO 2 Add 25 mL of 1.2 mg / mL PdCl to the carrier 2 Solution and 100mL deionized water, stirred for 3h, adjusted the pH value of the solution to about 10, and then slowly added NaBH with a concentration of 0.1mol / L 4 Mixed solution with NaOH to excess, so that Pd is completely reduced, stirred at room temperature for 6 hours, centrifuged, washed with deionized water until the ion concentration is lower than 10ppm, and dried in an oven at 80°C to obtain the supported Pd / N-TiO 2 catalyst.

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Abstract

The invntion discloses a Pd triple-effect low-temperature catalyst taking nitrogen-doped titanium dioxide as a carrier as well as a preparation method and application thereof. Pd nanoparticles are loaded on an N-TiO2 semiconductor carrier with a light absorption effect to prepare the loaded type Pd catalyst; a TiO2 semiconductor is doped with N and visible light is introduced, so that low-temperature and high-efficiency catalytic removal of CO / NO can be realized by utilizing a photo-thermal coupling effect. According to the Pd triple-effect low-temperature catalyst, non-metal-doped TiO2 is introduced, so that the obtained catalyst can be used for removing CO and NO under the visible light, and the catalyst, which takes non-toxic and green N-TiO2 as a semiconductor, is expected to be prepared into a smearing type; the preparation method of the catalyst is simple and feasible and the catalyst is easier to popularize and apply.

Description

technical field [0001] The invention belongs to the field of environmental protection and air purification, and specifically relates to a Pd three-effect low-temperature catalyst with nitrogen-doped titanium dioxide as a carrier and its preparation method and application. The supported Pd catalyst can improve the CO and NO catalytic removal effect. Background technique [0002] Since the 1970s, the continuous deterioration of environmental pollution, such as acid rain, the greenhouse effect, the hole in the ozone layer and water pollution, has seriously endangered the normal life and health of human beings. Among them, in my country's urban air pollution, the proportion of automobile exhaust emissions has exceeded 70%, and the emission of automobile exhaust not only caused great harm to our lives and the environment, but also brought great harm to human health. s damage. However, the self-purification ability of the atmosphere is not enough to degrade automobile exhaust. Th...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/08B01J37/03B01D53/86B01D53/56B01D53/94
CPCB01D53/8643B01D53/94B01D53/945B01J27/24B01J37/035B01J37/08B01D2257/404B01D2258/012B01J35/39
Inventor 戴文新谈小芳陈旬付贤智员汝胜
Owner FUZHOU UNIV
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