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TiZrO2 carrier and precious metal/TIZrO2 catalyst and preparation and application thereof

A catalyst and precious metal technology, applied in the field of supported catalysts and their preparation, can solve the problems of difficult to achieve large-scale production, complex preparation process, long preparation period, etc., and achieve the effects of low production cost, large specific surface area and good stability

Active Publication Date: 2013-06-19
杭州深瑞环境有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the uniform precipitation method has a long preparation cycle and requires heating; the sol-gel method has expensive raw materials, complicated preparation process, and is difficult to achieve large-scale production; and the co-precipitation method has cheap raw materials, simple operation, and mature technology, so this study adopts co-precipitation Law

Method used

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  • TiZrO2 carrier and precious metal/TIZrO2 catalyst and preparation and application thereof
  • TiZrO2 carrier and precious metal/TIZrO2 catalyst and preparation and application thereof
  • TiZrO2 carrier and precious metal/TIZrO2 catalyst and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] ① Dissolve 0.2xmol of titanium sulfate and 0.2(1-x)mol of zirconium oxychloride into 2.5L of ultrapure water, add 5ml of nitric acid to prevent hydrolysis, stir vigorously for 20min to prepare a titanium-zirconium composite salt solution. where x=0.1-0.5.

[0037] ②Titanium-zirconium compound salt solution was added dropwise to 1L of 12.5% ​​ammonia water at a rate of 15ml / min to form a white jelly.

[0038] ③ The colloid was aged at room temperature for 12 hours, vacuum filtered and washed, and the obtained filter cake was fully kneaded and extruded.

[0039] ④ After the extrudate is dried at room temperature, it is dried at 120°C for 2 hours, and then calcined at 500-900°C for one or two steps for 2-6 hours (see Table 1 for details).

[0040] ⑤ Equal volume impregnation of RuCl in vacuum 3 Solution, calcined at 350°C for 6h.

[0041] From figure 1 It can be seen that the statistical analysis of the strength data of Ru / xTiZr catalysts shows that they all obey the W...

Embodiment 2

[0043] ①Dissolve 0.1mol of titanium sulfate and 0.1mol of zirconium oxychloride into 2.5L of ultrapure water, add 5ml of nitric acid to prevent hydrolysis, add 200ml of hydrogen peroxide to homogenize the precipitation of titanium-zirconium salt solution, stir vigorously for 20 minutes to prepare titanium-zirconium Compound salt solution.

[0044] ②Titanium-zirconium compound salt solution was added dropwise to 1L of 25% ammonia water at a rate of 15ml / min to form a white jelly.

[0045] ③ The colloid was aged at room temperature for 12 hours, vacuum filtered and washed, and the obtained filter cake was fully kneaded and extruded.

[0046] ④The extrudate is dried at room temperature and then dried at 120°C for 2 hours, then calcined in one or two steps at 500-900°C for 2-6 hours.

[0047] ⑤ Vacuum equal volume impregnation of RuCl 3 Solution, calcined at 350°C for 6h. The molding and acetic acid corrosion results are shown in Table 1.

Embodiment 3

[0049] ① Dissolve 0.1mol of titanium sulfate and 0.1mol of zirconium oxychloride into 2.5L of ultrapure water, add 5ml of nitric acid to prevent hydrolysis, stir vigorously for 20min to prepare a titanium-zirconium composite salt solution.

[0050] ②Titanium-zirconium compound salt solution was added dropwise to 1L of 25% ammonia water at a rate of 15ml / min to form a white jelly.

[0051] ③ The colloid was aged at room temperature for 12 hours, vacuum filtered and washed, and the obtained filter cake was fully kneaded with 2% metatitanic acid and extruded.

[0052] ④The extrudate is dried at room temperature and then dried at 120°C for 2 hours, then calcined in one or two steps at 500-900°C for 2-6 hours.

[0053] ⑤ Equal volume impregnation of RuCl in vacuum 3 Solution, calcined at 350°C for 6h. The molding and acetic acid corrosion results are shown in Table 1. It can be seen from Table 1 that two-step calcination is better than one-step calcination. If the carrier wants ...

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Abstract

The invention provides a TiZrO2 carrier and a precious metal / TIZrO2 catalyst and preparation and application of the TiZrO2 carrier and the precious metal / TIZrO2 catalyst, and belongs to the field of water processing technology and environment function materials. The ZrO2 is stable in chemical property, and not only is not soluble in alkaline solution, but also can exist in acid solution stably. However, the specific surface area of the ZrO2 is small, and generally is only about 20m2 / g to 50m2 / g, and due to the fact that when the ZrO2 is calcined, the ZrO2 can generate martensite transformation, the fact that molded products have no intensity is caused. The precious metal / TIZrO2 catalyst is a catalytic wet air oxidation catalyst which is corrosion resisting, high-temperature resisting, high in strength, and big in specific surface area, and uses zirconium oxide stabilized by titanium oxide as a carrier to support precious metal Ru and Pt with high activity and difficult to run off, and prepares the excellent catalytic wet air oxidation catalyst. The prepared catalyst maintains good form after the prepared catalyst runs for 242 h under a high-temperature high-pressure acid environment with the temperature of 260 DEG C, the pressure of 5.7 MPa and the potential of hydrogen (PH) value of about 3, and the performance is beneficial to the popularization of a zirconium oxide supported catalyst in the industrialized application of catalytic wet air oxidation.

Description

technical field [0001] The invention relates to a supported catalyst with titanium-zirconium composite oxide as a carrier and noble metals Ru, Pd, and Pt as active components and a preparation method thereof, which can be used for catalytic wet oxidation treatment of high-concentration and refractory industrial wastewater, and belongs to water treatment technology and the field of environmental functional materials. Background technique [0002] Wet Air Oxidation (WAO for short) is an important and effective treatment method developed in the 1950s to degrade toxic, harmful and high-concentration organic wastewater. It oxidizes organic pollutants into CO in the liquid phase under the conditions of high temperature (150-350°C) and high pressure (0.5-20MPa), using oxygen in the air as the oxidant 2 and H 2 Chemical process of inorganic substances such as O or small organic molecules; no NO in this process X , SO 2 And harmful gases such as HCl are discharged. The WAO proce...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J23/46B01J23/44B01J23/42C02F1/72
Inventor 孙承林卫皇曌何松波赖玉龙马磊任健刘培娟闫晓淼
Owner 杭州深瑞环境有限公司
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