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Monolithic honeycomb coated catalyst, and preparation method and application thereof

A honeycomb catalyst and catalyst technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, heterogeneous catalyst chemical elements, etc., can solve the problem of increasing catalytic removal of chlorinated aromatics, high catalytic reaction temperature, and removal of dioxins Low effect and other problems, to achieve the effect of low cost and high efficiency

Inactive Publication Date: 2020-05-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, small particle fly ash is the main contributor to the production of chlorinated aromatics. Therefore, appropriately reducing the pore size of the catalyst can help to further increase the catalytic removal of chlorinated aromatics in fly ash. The integral extrusion method used in the above patent The pores of the honeycomb catalyst are relatively large, and the effect of removing dioxins is poor; high catalytic activity can further reduce the performance of catalyst coupling to remove dioxins, and in the published patents, the catalytic reaction temperature is relatively high

Method used

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  • Monolithic honeycomb coated catalyst, and preparation method and application thereof
  • Monolithic honeycomb coated catalyst, and preparation method and application thereof
  • Monolithic honeycomb coated catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] Weigh TiO 2 12.6g of powder, 12.5g of silica sol, 1.285g of ammonium metavanadate, 0.98g of ammonium paratungstate, 0.25g of cerium nitrate hexahydrate, 1.394g of zirconium nitrate pentahydrate, 0.266g of lanthanum nitrate hexahydrate, and 30g of water. g dispersant polyethylene glycol (average molecular weight is 6000) is added in the above-mentioned mixed solution, then add ball mill jar ball milling 120min, the rotating speed is 500 rev / min, makes slurry; Take it out after immersing in medium for 5min, blow out the excess slurry in the pores with compressed air, then microwave dry, and bake at 600°C for 2 hours to obtain monolithic structure catalyst S-1 (5% V 2 o 5 -4% WO 3 -0.5%CeO 2 -2%ZrO 2 -0.5% La 2 o 3 / 63%TiO 2 -25% SiO2 2 / cordierite honeycomb).

Embodiment 2

[0119] Weigh TiO 2 Powder 14.0g, SiO 2 4.0g of powder, 1.028g of ammonium metavanadate, 0.49g of ammonium paratungstate, 0.319g of cerium ammonium nitrate, 0.865g of zirconium sulfate tetrahydrate, 0.838g of lanthanum chloride hexahydrate, and 30g of water to obtain a mixed solution, and 0.5g of dispersant polyacrylic acid (the average molecular weight is 5000) was added to the above mixed solution, and then added to a ball mill and milled for 60 minutes at a speed of 400 rpm to obtain a slurry; immerse 1ml of 100-mesh cordierite honeycomb carrier in the slurry for 5 minutes and take it out by compressing The excess slurry in the pores was blown out by air, then microwave-dried, and calcined at 400° C. for 4 hours to obtain monolithic catalyst S-2 (4% V 2 o 5 -2% WO 3 -0.5%CeO 2 -1.5%ZrO 2 -2.0% La 2 o 3 / 70%TiO 2 -20% SiO2 2 ) / cordierite honeycomb).

Embodiment 3

[0121] Weigh TiO 2 15.6g of powder, 7.5g of silica sol, 0.77g of ammonium metavanadate, 0.735g of ammonium paratungstate, 0.252g of cerium nitrate hexahydrate, 0.348g of zirconium nitrate pentahydrate, and 30g of water are mixed liquid, and 0.5g of dispersant polyvinyl alcohol ( The average molecular weight is 18000) was added to the above mixed solution, and then added to a ball mill and milled for 30 minutes at a speed of 600 rpm to obtain a slurry; 1ml of 100-mesh cordierite honeycomb carrier was soaked in the slurry for 5 minutes and taken out by compressing Excessive slurry in the pores was blown out by air, then microwave-dried, and fired at 500° C. for 4 hours to obtain monolithic structure catalyst S-3 (3% V 2 o 5 -3% WO 3 -0.5%CeO 2 -0.5%ZrO 2 / 78%TiO 2 -15% SiO2 2 ) / cordierite honeycomb).

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Abstract

The invention discloses a monolithic honeycomb coated catalyst, and a preparation method and an application thereof. The monolithic honeycomb coated catalyst comprises a honeycomb catalyst carrier anda catalytic coating; the catalytic coating comprises a carrier I and an active component; the active component comprises an active metal element; the active metal element comprises at least one of V,W, Ce, Zr and La; and the carrier I comprises TiO2 and SiO2. The catalyst couples a denitration process and a dioxin removal process integrally, and is high in efficiency and low in cost, and the contribution of small-particle fly ash to dioxin can be remarkably reduced through the catalyst of an integral coating structure; and additionally, the high activity also effectively inhibits the generation of dioxin.

Description

technical field [0001] The application relates to an integral honeycomb coated catalyst and its preparation method and application, belonging to the field of catalyst and its preparation. Background technique [0002] NOx and dioxins are produced during the combustion of garbage and coal. The formation mechanism of NOx is divided into three types: (1) thermal type; (2) instantaneous response type; (3) fuel type. NOx is emitted in the form of gaseous pollutants; while the formation mechanism of dioxins is relatively complex, mainly including three ways: (i) Pyrosynthesis, that is, homogeneous high-temperature gas phase formation, at 500–800°C from The graphitic carbon structure is cracked to generate PCDD / Fs, and a large amount of carbon black and polycyclic aromatic hydrocarbons (PAHs), as well as many PCDD / Fs precursor compounds, such as chlorobenzenes (CBs), chlorophenols (CPs), polychlorinated biphenyls ( PCBs) and polychlorinated diphenyl ethers (PCDEs), etc.; (ii) de n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J37/02B01J35/04B01D53/90B01D53/56B01D53/70
CPCB01J23/30B01J37/0215B01D53/90B01D53/8628B01D53/8662B01J2523/00B01J35/56B01J2523/3712B01J2523/41B01J2523/47B01J2523/48B01J2523/55B01J2523/69B01J2523/3706
Inventor 王胜王树东程昊张海军李德伏
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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