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Enhanced denitration monolithic catalyst coating slurry, and preparation method and application thereof

A kind of integral catalyst and catalyst technology, which is applied in the direction of catalyst activation/preparation, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc. It can solve the problems of affecting catalyst activity, large amount of addition, and not very firm adsorption, etc., to achieve benefit Stable storage, extended stable period, and the effect of adding a small amount

Active Publication Date: 2018-04-27
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

Traditional dispersants have a certain dispersion and stabilization effect on solid particles in the dispersion medium, but because their adsorption on the surface of the particles is not very firm, they are easy to desorb from the surface of the particles and cause the dispersed particles to gather or precipitate again. To achieve a better dispersion effect, the amount of dispersant added is relatively large, which will inevitably increase the viscosity of the catalyst coating slurry, thereby causing difficulties in the coating of the overall catalyst, and at the same time, the residue of roasting is more likely to affect the final catalyst. Activity
Secondly, unlike the dispersion of single-component slurry, the coating slurry used for monolithic catalyst coating is mostly a mixture suspension of catalytically active components, catalytic promoters, and carrier component precursors, containing a variety of different valence states And characteristic metal ions, which will also have an impact on the effect of the dispersant

Method used

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  • Enhanced denitration monolithic catalyst coating slurry, and preparation method and application thereof
  • Enhanced denitration monolithic catalyst coating slurry, and preparation method and application thereof
  • Enhanced denitration monolithic catalyst coating slurry, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Preparation of Hyperdispersant

[0037] (1-1) Add 75ml of cyclohexanone, 2.8ml of styrene and 2.5g of maleic anhydride in the four-necked flask equipped with stirring, reflux condensation, thermometer and nitrogen device, and add 0.005g after three times of vacuuming and nitrogen replacement The benzoyl peroxide was heated to 110 °C in a water bath for 4 hours and then cooled to room temperature. Then adjust the pH value to 7-8 with 30% sodium hydroxide to obtain a light yellow slightly viscous liquid, which is a copolymer of styrene and maleic anhydride, which is denoted as hyperdispersant A for later use.

[0038] (1-2) In the four-necked flask equipped with stirrer, reflux condenser, dropping funnel and thermometer, add 80ml of deionized water, 0.4g of emulsifier sodium lauryl sulfate, 20g of butyl acrylate and 30g of Methyl methacrylate, stirred and dissolved, heated to 80°C in a water bath, 13ml of acrylic acid and an aqueous solution containing 0.48g o...

Embodiment 2

[0043] Example 2: Catalyst Coating Suspension Slurry Preparation

[0044] (a) Solution preparation: weigh the catalyst active component V 2 O 5 The precursor salt ammonium metavanadate 2.30g and the catalyst promoter WO 3 20.2 g of the precursor salt of ammonium paratungstate was dissolved in 120 ml of deionized water at 80-90 °C, and cooled to room temperature to obtain mixed solution A.

[0045] (b) Pre-dispersion of hyperdispersant: 0.9 g of hyperdispersant A and 0.09 g of n-hexanol are uniformly dispersed in mixed solution A under stirring to obtain mixed solution B.

[0046] (c) ball milling liquid preparation: weigh 5 g of ethanolamine and 40 g of silica sol with a mass concentration of 25%, slowly add to the mixed solution B obtained in step (b) under stirring, and mix thoroughly to obtain ball milling mixed liquid C.

[0047] (d) Ball milling slurry: weigh 90 g of anatase TiO 2 Place in a ball-milling tank, slowly add the ball-milling mixed solution C obtained in s...

Embodiment 3

[0051] Example 3: Catalyst Coating Suspension Slurry Preparation

[0052] (a) Solution preparation: weigh the catalyst active component V 2 O 5 The precursor salt ammonium metavanadate 10.0g and the catalyst promoter WO 3 50.0 g of the precursor salt of ammonium paratungstate was dissolved in 440 ml of deionized water at 80-90 °C, cooled to room temperature, and mixed solution A was obtained.

[0053] (b) Pre-dispersion of hyperdispersant: 7.0 g of hyperdispersant B and 0.7 g of n-hexanol are uniformly dispersed in mixed solution A under stirring to obtain mixed solution B.

[0054] (c) ball milling liquid preparation: weigh 10 g of ethanolamine and 80 g of silica sol with a mass concentration of 25%, slowly add to the mixed solution B obtained in step (b) under stirring, and mix thoroughly to obtain ball milling mixed liquid C.

[0055] (d) Ball milling slurry: weigh 150 g of anatase TiO 2 Place in a ball-milling tank, slowly add the ball-milling mixed solution C obtained...

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Abstract

The invention discloses an enhanced denitration monolithic catalyst coating slurry having a long stable period, and a preparation method thereof. The slurry is prepared through adding proper amounts of an inorganic binder, a pH regulator, a hyperdispersant and a foam inhibitor to a V2O5-WO3-TiO2 catalyst system and carrying out ball milling. The polymer type hyperdispersant having an anchoring group and a solvation chain is used in the ball milling process of the catalyst slurry to substitute a traditional homopolymer, so the stable period of the slurry is greatly prolonged, stable storage, conveyage and use of the slurry are benefited, and the preparation method is especially suitable for industrial production amplification. Additionally, the addition amount of the hyperdispersant is small, so the hyperdispersant almost has no obvious influences on the subsequent preparation process of the monolithic catalyst, such as channel blowing, drying and calcination.

Description

technical field [0001] The present invention relates to a suspension slurry for the preparation of an integral catalyst coating, in particular to an improved and enhanced long-stable period denitration catalyst coating suspension slurry and a preparation method. technical background [0002] Monolithic catalysts are usually non-metallic or metal supported catalysts with many small parallel or tortuous channels. The catalyst active components are supported on the surface of the channels, and the channels are divided by thin partition walls. In recent years, the advantages of monolithic catalysts have been fully recognized internationally, so they have been promoted in the field of industrial catalysis at an alarming rate. At present, in the world, integrated catalysts and technologies have been used in the field of environmental protection (vehicle exhaust purification, selective catalytic reduction of fixed source NOx, treatment of volatile organic compounds, etc.), petroch...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/30B01J37/02B01J2523/00B01J2523/55B01J2523/69B01J2523/47
Inventor 王树东程昊袁中山倪长军张学彬杨晓野
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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