Catalyst for catalytic combustion of chlorine-containing volatile organic gas, and preparation method thereof

An organic gas, catalytic combustion technology, used in catalyst activation/preparation, combustion methods, physical/chemical process catalysts, etc., can solve the problems of loss of active components, affecting catalyst activity and service life, catalyst poisoning, etc. performance, reduce the probability of generating chloride salts, and improve the effect of purification

Pending Publication Date: 2020-05-12
宁波鸿朗环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although both catalysts can effectively purify chlorine-containing volatile organic gases, during the combustion process of chlorine-containing volatile organic compounds, chlorine easily interacts with active components such as iron, manganese, cerium, and ruthenium in the catalyst. It is easy to react, causing catalyst Cl poisoning, and even the loss of active components, which seriously affects the activity and service life of the catalyst.

Method used

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  • Catalyst for catalytic combustion of chlorine-containing volatile organic gas, and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment A1

[0037] Step one: dissolve 101.37g of Ti(SO in 10wt% dilute sulfuric acid 4 ) 2 To obtain solution A, dissolve 143.04g of tetraethyl orthosilicate in absolute ethanol to obtain solution B; the solute concentrations in solution A and solution B are both 0.1mol / L, and solution A is added dropwise to solution B to form a mixed solution C;

[0038] Step 2: Slowly add 20% ammonia water dropwise to the mixed solution C until the pH of the solution is 9-13 and a precipitate is formed. After the precipitate is filtered out, rinse it repeatedly with deionized water, and use a vacuum pump at -0.1MPa negative pressure at the same time Suction filtration was carried out until the supernatant liquid obtained after suction filtration was mixed with Ba(NO 3 ) 2 Detect that there is no residual SO4 in the washing liquid 2- Until the filter cake D is obtained, the filter cake D is placed in a drying oven and dried at 110°C for 24 hours;

[0039] Step 3: Take by weighing 32.79g of Ce(NO 3 ...

Embodiment A2

[0043] The difference between this embodiment and embodiment A1 is that the tetraethyl orthosilicate selected is 133.50g, Ti(SO 4 ) 2 It is 94.61g. In addition, step six: take 19.42g of Co (N0 3 ) 2 ·6H 2 O and C 6 h 8 o 7 ·H 2 O is dissolved in deionized water to form a 0.1mol / L solution G;

[0044] Step 7: Immerse the corresponding quality catalyst M-Ce-O / TiO prepared in step 5 into the solution G 2 -SiO 2 , using 100~200uW / cm 2 UV irradiation, aging in helium environment for 12h, drying overnight at 110°C, and then placing the aged raw material in a muffle furnace, the temperature of the muffle furnace is raised from room temperature to 200°C at 2°C / min, and kept for 30min , and then heated up to 500°C at 10°C / min, and calcined at 500°C for 3 hours to prepare the catalyst Co / La-Ce-O / TiO 2 -SiO 2 .

Embodiment B1

[0046] Step one: dissolve 97.62g of Ti(SO in 10wt% dilute sulfuric acid 4 ) 2 To obtain solution A, dissolve 112.70 g of tetraethyl orthosilicate in absolute ethanol to obtain solution B; the solute concentrations in solution A and solution B are both 0.1mol / L, and solution A is added dropwise to solution B to form a mixed solution C;

[0047] Step 2: Slowly add 20% ammonia water dropwise to the mixed solution C until the pH of the solution is 9-13 and a precipitate is formed. After the precipitate is filtered out, rinse it repeatedly with deionized water, and use a vacuum pump at -0.1MPa negative pressure at the same time Suction filtration was carried out until the supernatant liquid obtained after suction filtration was mixed with Ba(NO 3 ) 2 Detect that there is no residual SO4 in the washing liquid 2- Until the filter cake D is obtained, the filter cake D is placed in a drying oven and dried at 110°C for 24 hours;

[0048] Step 3: Take by weighing 45.40g of Ce(NO 3 ...

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Abstract

The invention discloses a catalyst for catalytic combustion of chlorine-containing volatile organic gas. The catalyst comprises a composite oxide TiO2-SiO2 as a carrier and a composite metal oxide M-Ce-O as an active component, wherein M is one of La, Zr and Ca. The TiO2-SiO2 is used as a composite carrier, TiO2 can provide a certain surface acid site, and SiO2 can promote dispersion of TiO2 on the surface of the catalyst and ensure that the catalyst has high structural strength and the possibility that the catalyst is mechanically damaged by abrasion, vibration and the like is reduced; M canform a solid solution with Ce, so that the lattice defect degree of CeO2 can be increased, oxygen vacancies on CeO2 are increased, many active oxygen species are provided in the reaction process, andthe ignition temperature of catalytic combustion is reduced, thereby the activity of the catalyst is improved, and the generation possibility of dioxin can be reduced; and M can protect Ce, so the main active component CeO2 and the chlorine element are prevented from producing chlorine salt and losing. In addition, the preparation method is simple and suitable for large-scale production.

Description

technical field [0001] The invention relates to the field of air pollution prevention and control, in particular to the purification of industrial waste gas containing volatile organic compounds, in particular to a catalyst for catalytic combustion of volatile organic gases containing chlorine and a preparation method thereof. Background technique [0002] Industrial organic waste gas emissions have become an important source of complex air pollution in my country. The main pollutants are volatile organic compounds (Volatile Organic Compounds, VOCs), including benzene series, aldehydes, ketones and halogenated hydrocarbons. These substances can be produced in various production links of printing and dyeing, agriculture, pesticides, medicine, organic synthesis and other industries. Among all VOCs, chlorine-containing volatile organic compounds (Cl-VOCs) have a stable structure, and Cl-VOCs are difficult to biodegrade, easy to accumulate in organisms, and have strong carcinoge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J23/83B01J37/08B01J37/34F23G7/07
CPCB01J23/002B01J23/10B01J23/83B01J37/346B01J37/082B01J37/345F23G7/07B01J2523/00F23G2209/142B01J2523/3706B01J2523/3712B01J2523/41B01J2523/47B01J2523/23B01J2523/845B01J2523/48
Inventor 屠黎丽
Owner 宁波鸿朗环保科技有限公司
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