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Denitration catalyst and preparation method thereof

A denitrification catalyst and additive technology, applied in the field of denitrification catalysts, can solve problems such as complex process, single applicability of regeneration and recovery process, and difficult separation of valuable elements, so as to shorten the process flow, reduce investment and operating costs, and excellent denitrification performance Effect

Active Publication Date: 2020-11-24
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a denitration catalyst, a preparation method of a denitration catalyst and The denitrification catalyst prepared by this method

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  • Denitration catalyst and preparation method thereof
  • Denitration catalyst and preparation method thereof
  • Denitration catalyst and preparation method thereof

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preparation example Construction

[0044] The second aspect of the present invention provides a method for preparing a denitration catalyst, wherein, as figure 1 As shown, the method includes:

[0045] (1) The waste denitration catalyst is subjected to the first impurity removal and crushing to obtain waste denitration catalyst powder;

[0046] (2) Surface treatment of the waste denitration catalyst powder with a surface treatment agent, and solid-liquid separation to obtain a solid phase and a liquid phase;

[0047] (3) After washing the solid phase, performing bulk phase modification and surface modification, and drying, to obtain a carrier material;

[0048] (4) Immerse the carrier material in an impregnation solution containing active metal components and auxiliary agents, and obtain the denitration catalyst after drying and roasting;

[0049] In step (2), the surface treatment agent is lye, the mass concentration of the lye is 6-50wt%, and the conditions of the surface treatment include: the treatment temperature i...

Embodiment 1

[0112] a) 100g of spent denitrification catalyst is cleaned, ash blown under negative pressure, then ultrasonically cleaned and dried, ball milled to 400 mesh, then 600ml of NaOH solution with a mass concentration of 30wt% is added, treated at 160℃ for 1 hour, and centrifuged , Get solid phase and liquid phase.

[0113] b) The solid phase in step a) was washed three times with 200ml of water, and then a 10wt% dilute sulfuric acid solution was heated and stirred at 90°C for 30 minutes, and then washed with deionized water to a conductivity of 85μs / cm. Mix and beat, then add 3wt% titanium oxysulfate and 1.5wt% silane coupling agent for stirring modification (temperature: 30°C, time: 4h), then place in an oven and dry at 120°C for 24h, and get Denitration catalyst carrier material A1, the moisture content is 7.1wt%, the specific surface area is 100m 2 / g, based on the total weight of the carrier material, the content of nano-titania whiskers is 16.8 wt%. The diameter of the nano ti...

Embodiment 2

[0121] a) 100 grams of waste denitrification catalyst is cleaned, ash blown under negative pressure, then ball milled to 400 mesh after ultrasonic cleaning and drying, and then 600ml of alkali solution is added, which contains 15wt% NaOH and 5wt% KOH , Treated at 180°C for 1 hour, centrifuged to obtain solid and liquid phases.

[0122] b) The solid phase in step a) was washed three times with 200ml of water, and then a 5wt% dilute sulfuric acid + 8wt% ammonium bisulfate solution was heated and stirred at 60°C for 30 minutes, and then washed with deionized water until the conductivity After 80μs / cm or less, mix with water and beating, then add 3wt% titanium sulfate and 1wt% silane coupling agent for stirring modification (temperature: 60℃, time: 1h), then in an oven at 120℃ After drying for 24 hours, the denitration catalyst carrier material A2 is obtained, with a water content of 8.3wt% and a specific surface area of ​​110m 2 / g, based on the total weight of the carrier material,...

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Abstract

The invention relates to the field of waste catalyst disposal, and discloses a denitration catalyst, a preparation method of the denitration catalyst and the denitration catalyst prepared by the method. The denitration catalyst comprises a titanium oxide carrier material, a metal active component and an auxiliary agent, wherein the carrier material comprises titanium oxide and nanocrystallized titanium oxide whiskers coating at least part of the outer surface of the titanium oxide, and based on the total weight of the carrier material, the content of the nanocrystallized titanium oxide whiskers is 5-30wt%. According to the denitration catalyst provided by the invention, the titanium oxide of which at least part of the outer surface is coated with the nanocrystallized titanium oxide whiskers is adopted as the carrier material, the denitration catalyst provided by the invention has excellent denitration catalytic activity, and meanwhile, the carrier material is obtained by recycling thewaste denitration catalyst, so that the cost of the denitration catalyst is obviously reduced, and the environmental pollution is reduced.

Description

Technical field [0001] The invention relates to the field of waste catalyst disposal, in particular to a denitration catalyst, a preparation method of a denitration catalyst and a denitration catalyst prepared by the method. Background technique [0002] Catalysts play a very important role in the chemical industry. About 90% of chemical processes require catalysts. At present, there are more than 2,000 types of catalysts used in the chemical industry, and the amount of catalysts used is more than 800,000 tons. The amount of waste catalyst produced worldwide is about 500,000-700,000 tons per year. It contains a lot of valuable metals, such as precious metals (Pt, Ru, Pd, Au and Ag, etc.), non-ferrous metals (Cu, Co, Ni, Cr, etc.). [0003] The recovery of spent catalysts in my country started late. In the past, waste catalysts were disposed of by landfill, which not only polluted the environment, but also caused a waste of resources. [0004] In recent years, as the country attache...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J23/34B01J35/10B01D53/86B01D53/56
CPCB01J23/30B01J23/34B01D53/8628B01J35/61
Inventor 何发泉林德海刘子林曹子雄马少丹王宝冬
Owner CHNA ENERGY INVESTMENT CORP LTD
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