A kind of synthetic method of selenium-doped zirconia catalyst

A synthesis method and technology of zirconia, applied in physical/chemical process catalysts, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve the problems of high catalyst cost and high catalyst consumption, and achieve low synthesis cost and low selenium content , good practical effect

Active Publication Date: 2021-07-13
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing methods have many limitations, such as high catalyst dosage, high catalyst cost, and the use of strong oxidants, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In a 50mL round bottom flask, the ethanol solution of zirconium dioxide, trimethylisopropoxymethyl ammonium fluoride, and prefabricated sodium selenium hydride (equal moles of sodium borohydride and selenium powder in ethanol 0 o After C mixing, under nitrogen protection, 60 o C for 5 h prefabrication, sodium selenium hydride concentration 0.2 mol / L) were mixed according to the ratio of 50 mmol: 0.1 mmol: 10 mL, stirred at room temperature for 24 hours, filtered and washed with water. Add this catalyst material to the 1,4-dioxane solution of 0.01 mol / L β-carotene (add 20 mg catalyst per 100 mL solution), 80 o Oxygen (0.88 mL / s) was introduced at C, and the color faded after 6 hours. According to ICP analysis, the selenium content in the catalyst is extremely low, only 0.21% (mass content).

Embodiment 2

[0019] Other conditions are the same as in Example 1, and the properties of materials produced by different ammonium fluoride additives are tested. The experimental results are shown in Table 1.

[0020] Table 1 Properties of materials produced by different ammonium fluoride additives

[0021] serial number Ammonium Fluoride Additives Color fade time (hours) 1 Trimethylisopropoxymethylammonium fluoride (Example 1) 6 2 Trimethylmethoxymethylammonium fluoride 19 3 tetramethylammonium fluoride 36 4 tetraethylammonium fluoride 32 5 Tetra-n-butylammonium fluoride 31

[0022] From the above results, it can be seen that the auxiliary agent used in the reaction is preferably trimethylisopropoxymethylammonium fluoride (Example 1), and the catalyst synthesized from it as a raw material has the highest activity and the fastest fading (No. 1).

Embodiment 3

[0024] Other conditions were the same as in Example 1, and the effects of different ratios of zirconium dioxide and sodium selenium hydride ethanol solution (0.2 mol / L) were tested, and the experimental results are shown in Table 2.

[0025] Table 2 Effect test of different ratios of zirconium dioxide and sodium selenium hydride in ethanol solution (0.2mol / L)

[0026] serial number Ratio of zirconium dioxide to ethanol solution of sodium selenium hydride (0.2mol / L) (mmol / 10mL) Fade time (hours) 1 30 23 2 40 15 3 50 (Example 1) 6 4 60 12 5 70 22

[0027] It can be known from the above results that the ratio of zirconium dioxide to ethanol solution of sodium selenide (0.2 mol / L) is preferably 50 mmol / 10 mL (Example 1).

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PUM

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Abstract

The invention discloses a synthesis method of a selenium-doped zirconia catalyst. The steps are as follows: mix zirconium dioxide, ammonium fluoride additives, and ethanol solution of sodium selenium hydride in a ratio of 30-70 mmol:0.05-0.15 mmol:10 mL, stir at room temperature for 12-36 hours, then filter and wash with water, wherein , the concentration of sodium selenium hydride in the ethanol solution of sodium selenium hydride is 0.2mol / L. The catalyst can be used to catalyze the oxidative degradation of carotene, and the synthesis cost of the catalyst is low, metal-free, low in selenium content, and the catalytic effect is good. Good sex.

Description

technical field [0001] The invention relates to a synthesis method of a selenium-doped zirconia catalyst, belonging to the field of catalyst material preparation. Background technique [0002] Selenium-catalyzed chemistry is a research field that has just emerged in the past five years. Our research group has done a series of work in this field and developed a green synthetic method for the synthesis of various useful chemical intermediates using selenium-catalyzed methods. However, there are few reports on the application of selenium-containing catalyst materials in environmental treatment, mainly due to the difficulty in synthesizing homogeneous selenium catalysts and the high cost of catalysts. Therefore, the development of low-cost and high-efficiency heterogeneous catalysts and their application to environmental governance can expand the application range of selenium-catalyzed chemistry and have both academic and practical value. [0003] On the other hand, β-carotene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/057C02F1/72C02F101/32C02F103/32
CPCB01J27/0573C02F1/725C02F1/727C02F2101/32C02F2103/32
Inventor 郑英豪刘闯俞磊吴爱琼曹洪恩张旭
Owner YANGZHOU UNIV
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