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Catalyst for reducing bromate in liquid phase as well as preparation method and application thereof

A liquid-phase catalysis and catalyst technology, applied in the direction of catalyst activation/preparation, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of high price, influence on electronic effect, influence on catalytic bromate reaction effect, etc., and achieve no secondary pollution , the effect of high catalytic activity

Active Publication Date: 2017-11-24
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, the interaction between the metal and the support will not only affect the particle size of the active metal Pd, but also affect its electronic effect, which will have a significant impact on the effect of catalyzing the bromate reaction.
[0006] At present, the most commonly used catalyst supports are silica and alumina, which have the advantages of low price and stable structure and properties, but the interaction between metal and support is weak, and the catalytic effect after loading Pd is not ideal.
while CeO 2 , ZrO 2 As a carrier, it will form a strong interaction between the metal and the carrier, but the price is relatively high
In addition, through the traditional loading method, the interaction between the metal and the support formed by the impregnation method is weak, and the ideal catalytic activity cannot be obtained.

Method used

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  • Catalyst for reducing bromate in liquid phase as well as preparation method and application thereof
  • Catalyst for reducing bromate in liquid phase as well as preparation method and application thereof
  • Catalyst for reducing bromate in liquid phase as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1 Catalyst and its preparation

[0036] Preparation of ad-Pd / Ce-SBA-15 catalyst: Add a certain amount of mesoporous silica SBA-15 into the aqueous solution of cerium nitrate by impregnation method. dry, dried at 105°C, and calcined in a muffle furnace at 400°C for 5 hours to obtain modified CeO 2 The carrier Ce-SBA-15 is spare. Then the obtained Ce-SBA-15 was added to a certain amount of chloropalladium acid solution, and the pH value of the solution was adjusted to 3.6 by adding deionized water, stirred for 24 hours, filtered, washed several times with deionized water, and dried. And pass H at 300 degrees 2 After gas reduction for 2 hours, the catalyst for the liquid-phase catalytic reduction of bromate was obtained, which was denoted as ad-Pd / Ce-SBA-15.

[0037] CeO in the ad-Pd / Ce-SBA-15 catalyst synthesized above 2 The particle HAADF diagram and the EDS element Mapping diagram are as follows figure 1 . On the Pd / Ce-SBA-15 catalyst synthesized by ads...

Embodiment 2

[0038] The isoelectric point of embodiment 2 carrier

[0039]

[0040] According to the method of Example 1, Ce-SBA-15 supports with different Ce contents were prepared by the impregnation method. Among them, the content of Ce is 2.34wt.%, 4.69wt.%, 6.76wt.%. With the increase of Ce content, the isoelectric point of carrier SBA-15 gradually increases close to CeO 2 The isoelectric point of , indicating that Ce was successfully modified on SBA-15.

Embodiment 3

[0041] The catalytic activity of embodiment 3 catalyst

[0042] According to the method of Example 1, the ad-Pd / Ce-SBA-15 catalyst was prepared by the impregnation-adsorption method, wherein the content of Ce was 4.96wt.%, and the content of Pd was 0.91wt.%. The catalyst is applied in the reaction of liquid phase catalytic bromate hydrogenation reduction, the specific process is: a certain amount of potassium bromate is dissolved in a four-neck round bottom flask equipped with deionized water, wherein the initial concentration of bromate is 0.6mM . The potassium bromate solution in the solution was adjusted to pH 5.6 with HCl. There are 4 outlets on the round bottom flask, one is an inlet, one is an outlet, one is used to measure the pH value of the solution, and one is a sampling port. The consumption of catalyst is 0.028g / L, after adjusting pH, add catalyst, under vigorous stirring, pass 30 minutes of N 2 gas to remove the oxygen present in the solution, then switch the g...

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PUM

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Abstract

The invention discloses a catalyst for catalytically reducing bromate to bromine ions in a liquid phase as well as a preparation method and application thereof. The catalyst takes silicon oxide C as a carrier and is obtained by the following steps: loading transition metal B on the C through an immersion method; after drying and roasting, obtaining C modified by B oxide BOx; then selectively loading noble metal Pd on the BOx through an adsorption method to obtain a Pd / B-C catalyst, wherein the metal B is Ti, Zr or Ce and exists in the form of metal oxide on the carrier after roasting. The preparation method of the catalyst comprises the following steps: adding the carrier C into a salt solution of the metal B, and immersing, evaporating to dryness, drying and roasting to obtain B-C; adding the B-C into a salt solution, with the pH (Potential of Hydrogen) of 3 to 4, of the metal Pd and stirring for 24h or longer; filtering, drying and reducing to obtain the Pd / B-C catalyst. The Pd / B-C catalyst disclosed by the invention is used for reaction for catalytically reducing the bromate in the liquid phase and has efficient catalytic activity.

Description

technical field [0001] The invention relates to a supported Pd-based catalyst and a preparation method thereof, specifically comprising a catalyst for liquid-phase catalytic reduction of bromate, a preparation method thereof, and an application of the catalyst in liquid-phase catalytic reduction of bromate. Background technique [0002] In recent years, ozone disinfection has been widely used in drinking water disinfection. Since all natural water bodies contain bromide, a variety of disinfection by-products will be produced during the oxidation disinfection process, and bromate is one of them. Currently, bromate is a Class 2B potential carcinogen identified by the National Cancer Institute. All countries have established relevant control standards for bromate. The U.S. Environmental Protection Agency and the World Health Organization stipulate that the bromate concentration threshold in drinking water is 10 μg / L. Domestically, the hygienic standard for drinking water als...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03B01J37/02B01J37/18C02F1/70
CPCC02F1/70B01J29/0325B01J37/0201B01J37/0205B01J37/18B01J2229/186
Inventor 郑寿荣孙敬雅许昭怡万海勤韩玉香侯吉妃宁欣刘慧李明会张佳润
Owner NANJING UNIV