Coating type wear-resistant vanadium denitration catalyst, and preparation method and application thereof

A denitration catalyst and catalyst technology, which are applied in the field of catalysis, can solve the problems that small-sized coated catalysts are difficult to handle large flow of flue gas, difficult to achieve uniform adhesion strength, and difficult to regenerate, so as to ensure uniformity and improve wear resistance. performance, improve stability

Active Publication Date: 2020-04-21
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the coated catalyst has the advantages of less active catalyst consumption, controllable catalytic activity and less secondary solid waste compared with the extruded catalyst, the large-sized honeycomb catalyst for the treatment of large flue gas volume is limited to the overall extrusion mode, Large-size honeycomb carrier coating is difficult to achieve uniformity and adhesion strength of the catalyst on the carrier surface in terms of slurry formulation, coating process control and carrier property matching, and there are few methods to prepare large-size macroporous honeycomb carrier vanadium-based coated catalysts. Related reports
[0010] With the gradual increase in the requirements for industrial flue gas treatment, the use of traditional integral extruded honeycomb catalysts is not only costly, but also has problems such as regeneration difficulties, while small-sized coated catalysts are difficult to handle large-flow flue gas

Method used

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  • Coating type wear-resistant vanadium denitration catalyst, and preparation method and application thereof
  • Coating type wear-resistant vanadium denitration catalyst, and preparation method and application thereof

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Embodiment 1

[0065] This embodiment provides a preparation method of a coated wear-resistant vanadium-based denitration catalyst, the preparation method comprising the following steps:

[0066] (1) Mix ammonium metavanadate, ammonium metatungstate, ammonium tetramolybdate and titanium dioxide, and prepare the mixture into -120 mesh catalyst powder by spray drying. In terms of oxide content, the mass fraction of vanadium oxide in the catalyst powder 5%, the mass fraction of tungsten oxide is 5%, the mass fraction of molybdenum oxide is 5%, and the mass fraction of titanium oxide is 85%;

[0067] (2) Mix silica sol, starch, glass fiber, ammonium fluoride, deionized water and the catalyst powder obtained in step (1) with a mass ratio of 12:0.5:0.7:0.3:50:30, and obtain catalyst slurry after wet ball milling material;

[0068] (3) Under the vacuum degree of -0.35kPa, the catalyst slurry obtained in step (2) is coated on the channel surface of the honeycomb carrier to obtain the catalyst green...

Embodiment 2

[0072] This embodiment provides a preparation method of a coated wear-resistant vanadium-based denitration catalyst, the preparation method comprising the following steps:

[0073] (1) Mix vanadium pentoxide, tungsten ethoxide, ammonium heptamolybdate and metatitanic acid, and prepare the mixture into -120 mesh catalyst powder by spray drying. In terms of oxide content, the mass fraction of vanadium oxide in the catalyst powder is 6%, the mass fraction of tungsten oxide is 8%, the mass fraction of molybdenum oxide is 9%, and the mass fraction of titanium oxide is 77%;

[0074] (2) Mix silica sol, carboxymethyl hydroxymethyl cellulose, high silica fiber, ammonium metaphosphate, deionized water and catalyst powder obtained in step (1) with a mass ratio of 8:0.3:0.6:0.2:40:25 , obtain catalyst slurry after wet ball milling;

[0075](3) Under the vacuum degree of -0.4kPa, the catalyst slurry obtained in step (2) is coated on the channel surface of the honeycomb carrier to obtain ...

Embodiment 3

[0079] This embodiment provides a preparation method of a coated wear-resistant vanadium-based denitration catalyst, the preparation method comprising the following steps:

[0080] (1) Mix vanadyl oxalate, ammonium paratungstate, molybdenum oxide and metatitanic acid, and prepare the mixture into -120 mesh catalyst powder by spray drying. In terms of oxide content, the mass fraction of vanadium oxide in the catalyst powder is 8%, tungsten The mass fraction of oxide is 6%, the mass fraction of molybdenum oxide is 10% and the mass fraction of titanium oxide is 76%;

[0081] (2) Mix silica sol, polyethylene oxide, rock fiber, polyethylene glycol, deionized water and catalyst powder obtained in step (1) with a mass ratio of 16:0.8:0.8:0.4:60:35, after wet ball milling Obtain catalyst slurry;

[0082] (3) Under vacuum degree of -0.3kPa, the catalyst slurry obtained in step (2) is coated on the channel surface of the honeycomb carrier to obtain the catalyst green body, and the coat...

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Abstract

The invention provides a coating type wear-resistant vanadium denitration catalyst, and a preparation method and an application thereof. The preparation method comprises the following steps: (1) mixing a vanadium source, a tungsten source, a molybdenum source and a titanium source, and preparing a catalyst powder from the obtained mixture; (2) mixing a binder, a structure enhancer, a dispersing agent, deionized water and the catalyst powder obtained in step (1), and carrying out ball milling treatment to obtain a catalyst slurry; (3) coating pores of a honeycomb carrier with the catalyst slurry obtained in step (2) under a negative pressure condition to obtain a catalyst blank; and (4) sequentially carrying out drying and heat treatment on the catalyst blank obtained in step (3) to obtainthe coating type wear-resistant vanadium denitration catalyst. The coating type wear-resistant vanadium denitration catalyst provided by the invention has high stability, the denitration activity at 250 DEG C is as high as 100%, and the surface layer wear rate is as low as 0.1%.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and relates to a denitration catalyst and its other methods and applications, in particular to a coating-type wear-resistant vanadium-based denitration catalyst and its preparation method and application. Background technique [0002] Selective catalyst reduction technology has been widely used in the denitrification projects of coal-fired power plants in my country due to its advantages of high denitrification efficiency and small footprint. The core of SCR technology is the denitrification catalyst. According to the structure classification, there are mainly honeycomb type, flat type and corrugated type. There are three types of plates. Among them, the market share of honeycomb denitration catalyst is relatively high. [0003] The honeycomb catalyst has the characteristics of small resistance and pressure drop, which can be divided into integral basic catalyst and surface-coated catalyst. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J37/02B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/30B01J37/0201B01J2523/00B01J2523/47B01J2523/55B01J2523/68B01J2523/69
Inventor 余剑李长明许启成高士秋李剑玲
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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