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Bifunctional catalyst and preparation method and application thereof

A dual-function catalyst and catalyst technology, applied in the direction of catalyst activation/preparation, preparation with chloride, chemical instruments and methods, etc., can solve the problems of deactivation, secondary pollution, catalyst poisoning, etc., and achieve no secondary pollution, Achieve recycling and long life effects

Active Publication Date: 2009-10-21
南京资环工程技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different from pure hydrogen chloride catalytic oxidation, the organic impurities contained in hydrogen chloride gas are likely to cause catalyst poisoning and deactivation. Although methods such as adsorption separation can be used to separate organic impurities from hydrogen chloride gas to avoid poisoning the catalyst, But it will cause secondary pollution when the adsorbent is regenerated

Method used

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  • Bifunctional catalyst and preparation method and application thereof
  • Bifunctional catalyst and preparation method and application thereof
  • Bifunctional catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Commercially available 17.4g cerium nitrate (Ce(NO 3 ) 3 ·6H 2 (2), 5.5g Potassium Chloride KCl and 13.5g Cupric Chloride CuCl 2 2H 2 O is completely dissolved in distilled water, and based on the molar number of copper, manganese nitrate Mn(NO 3 ) 2 Aqueous solutions of 0g, 2.9g, 8.6g, 17.2g and 25.8g, mixed the obtained mixed metal ion solution with 54g of ReY molecular sieve and 20g of silica sol with a mass fraction of 30%, formed, and dried in the air at 120°C Drying under the atmosphere for 10h, then roasting at 550°C for 3h, to obtain catalysts with different manganese oxide loads, wherein the load of cerium oxide is 12.8% by weight (with the weight of ReY molecular sieve as a reference, the same below), and the load of potassium oxide is 6.4% by weight, and the loading amount of copper oxide is 11.7% by weight; the loading amount of manganese oxide is 0% by weight, 1.3% by weight, 3.9% by weight, 7.7% by weight, and 11.6% by weight; the loading amount of si...

Embodiment 2

[0035] Catalyst performance evaluation for deep oxidation combustion of organic impurities was carried out in an atmospheric pressure quartz tube reactor. The inner diameter of the reaction tube is 24 mm, the outer diameter of the thermocouple sleeve is 5 mm, and the amount of catalyst loaded is 2 grams. Toluene is extracted by a double plunger micropump and sent to the vaporization chamber for vaporization, mixed with oxygen, and then enters the reactor for deep oxidation combustion reaction. The volume concentration of toluene in the mixed gas is 0.3vol%, and the total gas flow rate is 500mL·min -1 , Airspeed 12000h -1. The reaction temperature ranges from 240 to 400°C. The catalysts prepared in Example 1 with different loadings of manganese oxide were used to measure the results of deep oxidation combustion of toluene, which are listed in Table 1.

[0036] Table 1 The results of deep oxidation combustion of toluene on catalysts with different manganese oxide loadings

...

Embodiment 3

[0041] Commercially available 17.2g mass fraction is 50% manganese nitrate Mn(NO 3 ) 2 Solution, 13.5g copper chloride CuCl 2 2H 2 O and 17.4g Ce(NO 3 ) 3 ·6H 2 O is completely dissolved in distilled water, taking the molar number of copper as a basis, adding respectively potassium chloride 0g, 0.3, 0.6, 0.9, 1.5 potassium chloride 0g, 1.83g, 3.67g, 5.49g, 9.15g in the molar ratio of copper, the The resulting solution was mixed evenly with 50g of ReY molecular sieve and 20g of silica sol with a mass fraction of 30%, shaped, and dried in the air at 120°C for 10h, then calcined at 550°C for 3h to obtain different potassium oxide loadings catalyst, wherein the load of cerium oxide is 12.8% by weight (with the weight of ReY molecular sieve as a reference, the same below), the load of copper oxide is 11.7% by weight, and the load of manganese oxide is 7.7% by weight respectively; The loading amounts were 0 wt%, 2.1 wt%, 4.3 wt%, 6.4 wt%, and 10.7 wt%, respectively; the loadin...

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Abstract

The invention belongs to the field of environmental protection and catalyst, disclosing a bifunctional catalyst and a preparation method and an application thereof. The catalyst is prepared in a manner that substance containing rare earth metal element cerium, substance containing alkali metal element potassium and substance containing transition metal elements are loaded on a carrier under the action of adhesive to be baked; wherein transition metal elements are 1-3 elements of Cu, Mn, Fe, V, Co. The catalyst has low cost and high catalytic activity, does not cause secondary pollution, is suitable for preparation of chlorine by oxidation of hydrogen chloride to realize the recycling of chlorine resource, and is also suitable for deep oxidation combustion of organic impurities such as cyclohexane, benzene, toluene and the like in industrial waste gas.

Description

technical field [0001] The invention belongs to the fields of environmental protection and catalysts, and relates to a bifunctional catalyst, in particular to a bifunctional catalyst suitable for oxidation of hydrogen chloride and oxidative combustion of organic impurities. The invention also relates to a preparation method and application of the bifunctional catalyst. Background technique [0002] In the production process of organochlorine products such as cyclohexane chlorination to chlorocyclohexane, benzene chlorination to chlorinated benzene, toluene chlorination to ring or side chain chlorinated toluene, etc., 50% of chlorine is converted into by-product hydrogen chloride . Because raw materials such as cyclohexane, benzene, and toluene have low boiling points, it is difficult to be completely condensed and recovered, and the hydrogen chloride gas that escapes usually contains these organic impurities. At present, more and more attention has been paid to the recovery...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J23/847B01J23/83B01J23/78B01J37/04B01J37/08C01B7/04B01D53/72B01D53/86
Inventor 乔旭陈献凌玉辉崔咪芬汤吉海张雪华陆晓磊
Owner 南京资环工程技术研究院有限公司
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