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Preparation method of honeycomb-like manganese-based mullite catalyst for purifying VOCs (Volatile Organic Compounds)

A mullite and honeycomb-shaped technology, which is applied in the preparation field of honeycomb-like manganese-based mullite catalysts, can solve the problems of unclear mineralization efficiency, complicated operation and explosion of manganese-based mullite catalysts, and achieve excellent low temperature The performance of catalytic oxidation of complex multi-component VOCs, the effect of cheap and easy-to-obtain raw materials, and simple process operation

Pending Publication Date: 2021-08-24
NANTONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the prior art, mullite is also used as a catalyst for VOC oxidation. For example, Wang Weichao et al. have reported the SmMn2O5 mullite catalyst prepared by hydrothermal method to catalyze the conversion of VOC such as toluene or benzene [CN110433794A], but the amplified hydrothermal There is a risk of explosion in the reaction kettle under high temperature and pressure, and the mineralization efficiency of the manganese-based mullite catalyst prepared by this method is not clear
In addition, there are also methods such as coprecipitation (Mixed-phaseoxide catalyst based on Mn-mullite (Sm, Gd) Mn2O5forNOoxidationindieselexhaust.Science, 2012, 337:832-835.) and sol-gel [CN104624184A, CN103801288A] to prepare manganese-based mullite catalysts, but These preparation methods are complex in operation and high in energy consumption, and are not suitable for large-scale industrial production of manganese-based mullite catalysts. In view of these problems, a preparation method of a honeycomb-like manganese-based mullite catalyst for VOCs purification is provided.

Method used

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  • Preparation method of honeycomb-like manganese-based mullite catalyst for purifying VOCs (Volatile Organic Compounds)
  • Preparation method of honeycomb-like manganese-based mullite catalyst for purifying VOCs (Volatile Organic Compounds)
  • Preparation method of honeycomb-like manganese-based mullite catalyst for purifying VOCs (Volatile Organic Compounds)

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1: directly mix 10mmol manganese acetate, 5mmol samarium acetate, and 22.5mmol citric acid in solid form;

[0028] Step 2: Put the solid mixture in the step 1 into a crucible and place it in a muffle furnace;

[0029] Step 3: Raise the temperature to 750°C at a rate of 2°C / min in the muffle furnace, and maintain this temperature for 2 hours, so that the manganese acetate, samarium acetate, and citric acid in the muffle furnace fully react, and the obtained product is samarium manganese molybdenum Come stone catalyst, realize the preparation of samarium manganese mullite catalyst.

[0030] figure 1 and figure 2 They are the XRD pattern and FESEM pattern of the prepared samarium manganese mullite catalyst respectively. Characterized by FESEM, the prepared catalyst is SmMn2O5 mullite, which presents a three-dimensional connected honeycomb structure with a porous structure.

[0031] figure 2 Catalytic oxidation of 1000ppm benzene, 1000ppm toluene, 1000ppm chlorob...

Embodiment 2

[0034] Step 1: directly mix 10mmol manganese acetate, 5mmol samarium acetate, and 22.5mmol maleic acid in solid form;

[0035] Step 2: Put the solid mixture in the step 1 into a crucible and place it in a muffle furnace;

[0036] Step 3: Raise the temperature to 650° C. at a rate of 1° C. / min in a muffle furnace and maintain the temperature for 3 hours. The obtained product is samarium manganese mullite catalyst. The prepared honeycomb-like samarium manganese mullite catalyst was used for benzene oxidation, and obtained high benzene oxidation activity. The experimental results showed that: under the condition of 10000h-1 space velocity and saturated water vapor, the honeycomb-like samarium manganese mullite Stone catalytic oxidation of 1000ppm benzene, 1000ppm toluene, 1000ppm chlorobenzene, 1000ppm o-xylene, and 250ppm benzene, 250ppm toluene, 250ppm o-xylene, 250ppm chlorobenzene mixed component VOCs, the CO2 yield can reach 205℃, 188℃ respectively , 335°C, 233°C, and 346°C...

Embodiment 3

[0038] Step 1: 10 mmol of manganese acetate, 5 mmol of samarium acetate, and 22.5 mmol of ethylenediaminetetraacetic acid are directly mixed in solid form;

[0039] Step 2: Put the solid mixture in the step 1 into a crucible and place it in a muffle furnace;

[0040]Step 3: Raise the temperature to 700° C. at a rate of 3° C. / min in a muffle furnace and maintain the temperature for 3 hours. The obtained product is samarium manganese mullite catalyst. The honeycomb-like samarium-manganese mullite catalyst prepared in Example 3 was used for benzene oxidation, and higher benzene oxidation activity was obtained. The experimental results showed that: under 10000h-1 space velocity and saturated water vapor, the honeycomb-like Samarium manganese mullite catalyzes the oxidation of 1000ppm benzene, 1000ppm toluene, 1000ppm chlorobenzene, 1000ppm o-xylene, and 250ppm benzene, 250ppm toluene, 250ppm o-xylene, 250ppm chlorobenzene mixed component VOCs, and its CO2 yield reaches 210 ℃, 193...

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Abstract

The invention relates to a preparation method of a honeycomb-like manganese-based mullite catalyst for purifying VOCs (Volatile Organic Compounds). The method comprises the following steps: directly mixing a manganese salt, a rare earth salt and a self-polymerization monomer according to a certain proportion in a solid state, transferring the mixture into a crucible, and calcining the mixture in a muffle furnace at a certain temperature to obtain the manganese-based mullite catalyst for catalytic oxidation of high-activity VOCs. The process is simple, the final product can be obtained through one step, and the prepared mullite catalyst has good application prospects and economic benefits in the field of industrial VOCs flue gas purification.

Description

technical field [0001] The invention relates to the field of industrial flue gas purification, in particular to a method for preparing a honeycomb-like manganese-based mullite catalyst used for VOCs purification. Background technique [0002] Volatile organic compounds (VOCs) are commonly found in waste incineration, electric furnace steelmaking, iron ore sintering, metal smelting, coal burning, coking and other industrial exhaust gases. One of the main driving forces has brought serious impact on people's life and health. Catalytic oxidation technology has attracted wide attention because it can quickly convert VOC into harmless substances such as carbon dioxide and water at low temperature. The core of catalytic oxidation technology is the catalyst, and the commonly used catalysts are mainly noble metals and transition metal oxides. Although noble metals have the advantages of high catalytic activity, their disadvantages such as high price, easy high-temperature sinterin...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J23/889B01J35/04B01J37/08B01D53/86B01D53/72C01G45/00C01G45/02C01B33/26
CPCB01J23/34B01J23/8892B01J23/002B01J37/082B01D53/8668B01D53/8687C01B33/26C01G45/02C01G45/00B01D2257/7027B01D2257/708B01D2258/0283B01J35/56
Inventor 刘若宇刘敬印刘立忠张爵宁童熙倪家豪张巧玲朱润泽
Owner NANTONG UNIVERSITY
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