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Preparation method and application of trifolium-shaped catalyst for cooperatively controlling NOx and CVOCs

A collaborative control and catalyst technology, applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of increased bed pressure drop, difficult industrial applications, loading and unloading Inconvenience and other problems, to achieve the effect of high mechanical strength, high denitrification rate, wide application prospects

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

AI Technical Summary

Problems solved by technology

The powder catalyst will increase the pressure drop of the bed, and it is inconvenient to load and unload, so it is difficult to directly realize industrial application

Method used

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  • Preparation method and application of trifolium-shaped catalyst for cooperatively controlling NOx and CVOCs
  • Preparation method and application of trifolium-shaped catalyst for cooperatively controlling NOx and CVOCs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Step 1: Preliminarily mix 200g of titanium dioxide and 15g of ammonium metavanadate, and then put them into a ball mill tank for ball milling, milling for 30 minutes, with a speed of 40 rpm;

[0034] Step 2: taking out the ball mill mixture and drying it at 110°C for 4 hours, and roasting at 500°C for 4 hours in an air atmosphere to obtain a powder catalyst;

[0035] Step 3: Add 200g of powder catalyst and 6.2g of fiber prepared in Step 2 into the kneader, stir and gradually add 60mL of water, and keep stirring for 30min;

[0036] Step 4: Add 0.5g of stearic acid, 2.4mL of lactic acid, 1.7g of polyethylene oxide (PEO) and 2.0g of carboxymethyl cellulose (CMC) into the kneader step by step, with an interval of 30 minutes between each step, and keep stirring to obtain a wet material group;

[0037] Step 5: Install a clover-shaped mold, use an extruder to extrude the wet dough obtained in Step 4, dry at room temperature for 24 hours, and heat up rapidly at 10°C / min to 110...

Embodiment 2

[0041] Step 1: Preliminarily mix 200g of titanium dioxide and 34g of vanadyl acetylacetonate, and then add it to a ball milling tank for ball milling for 30 minutes at a speed of 40 rpm;

[0042] Step 2: taking out the ball mill mixture and drying it at 110°C for 4 hours, and roasting at 450°C for 4 hours in an air atmosphere to obtain a powder catalyst;

[0043]Step 3: Add 200g of powder catalyst and 6.2g of fiber prepared in Step 2 into the kneader, stir and gradually add 80mL of water, and keep stirring for 50min;

[0044] Step 4: Add 1.5g of stearic acid, 4.8mL of lactic acid, 1.0g of polyethylene oxide (PEO) and 1.0g of carboxymethyl cellulose (CMC) into the kneader step by step, with an interval of 30 minutes between each step, and keep stirring to obtain a wet material group;

[0045] Step 5: Install a clover-shaped mold, use an extruder to extrude the wet dough obtained in step 4, dry at room temperature for 24 hours, and heat up rapidly at 10°C / min to 110°C at room t...

Embodiment 3

[0049] Step 1: Preliminarily mix 200g of titanium-tungsten powder and 20g of vanadyl oxalate, and then put it into a ball mill tank for ball milling, ball milling for 30 minutes, and the speed is 80 rpm;

[0050] Step 2: taking out the ball mill mixture and drying it at 110°C for 4 hours, and roasting at 500°C for 4 hours in an air atmosphere to obtain a powder catalyst;

[0051] Step 3: Add 200g of powder catalyst and 6.2g of fiber prepared in Step 2 into the kneader, stir and gradually add 60mL of water, and keep stirring for 30min;

[0052] Step 4: Add 0.5g of stearic acid, 2.4mL of lactic acid, 1.7g of polyethylene oxide (PEO) and 2.0g of carboxymethylcellulose (CMC) into the kneader step by step, with an interval of 30 minutes between each step, and keep stirring to obtain a wet material group;

[0053] Step 5: Install a clover-shaped mold, use an extruder to extrude the wet dough obtained in step 4, dry at room temperature for 24 hours, and heat up rapidly at 10°C / min t...

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Abstract

The invention discloses a preparation method and application of a trifolium-shaped catalyst for cooperatively controlling nitrogen oxide (NOx) and a chlorinated volatile organic compound (CVOCs). The catalyst adopts an organic vanadium compound as a vanadium precursor, and titanium dioxide or titanium tungsten powder as a carrier, and is prepared by utilizing a two-step method comprising the concrete steps of (1) utilizing a mechanical milling method for preparing a powder catalyst; (2) adopting an extrusion molding process for preparing the trifolium-shaped structured catalyst. The obtained catalyst is applicable to removing the NOx and the CVOCs of industrial flue gas of the industries such as waste incineration, steel iron sintering and nonferrous metallurgy, and is also applicable to cooperatively removing the NOx and the CVOCs. Compared with an existing commercial catalyst, a commercial vanadium-based catalyst system is rarely changed, the two-step method is adopted, and the obtained catalyst not only has high denitrification rate and CVOCs removal efficiency but only has higher mechanical strength and abrasion resistance, so that the preparation method is a preparation technology beneficial for commercially producing the trifolium-shaped catalyst for cooperatively denitrating and removing the CVOCs.

Description

technical field [0001] The invention belongs to nitrogen oxides (NO x ) and chlorine-containing volatile organic compounds (CVOCs) synergistic control technical field, in particular to a preparation method and application of a clover-type catalyst for synergistic control of NOx and CVOCs. Background technique [0002] Waste incineration flue gas contains a large amount of nitrogen oxides (NO x ) and chlorine-containing volatile organic compounds (CVOCs, Chloride Volatile Organic Compounds) and other pollutants. Nitrogen oxides not only directly endanger human health, but also cause photochemical smog, acid rain, and promote the formation of secondary particulate matter, causing huge damage to the environment and society. Chlorine-containing volatile organic compounds are currently the focus of research in the field of environmental catalysis, and dioxins are a type of highly toxic CVOCs, which not only seriously pollute the environment but also have carcinogenic effects on...

Claims

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Application Information

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IPC IPC(8): B01J23/22B01J23/30B01J35/02B01D53/86B01D53/56B01D53/70B01D53/72
CPCB01D53/8628B01D53/8662B01D53/8668B01J23/002B01J23/22B01J23/30B01D2257/2064B01D2257/40B01D2257/708B01D2258/0283B01J35/00B01J35/30
Inventor 李俊华甘丽娜彭悦于双江王栋陈建军
Owner TSINGHUA UNIV
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