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Preparation method of ethanol-SCR catalyst

A catalyst and ethanol technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as personal health and safety injuries, catalyst failure, and increase catalyst pressure drop, and achieve improved anti-fly ash and Carbon deposition ability, high NOx conversion rate, improved anchoring effect

Pending Publication Date: 2020-10-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the normal operating temperature, the dew point of ammonium bisulfate is 147°C. It gathers on the surface of objects in liquid form or disperses in the flue gas in the form of droplets. Fly ash will adhere to the flue gas. After absorbing water from the flue gas Can cause corrosion of downstream equipment such as air preheaters; if it forms on low-temperature catalysts, it can cause fouling and blockage of catalyst parts, increase catalyst pressure drop or cause catalyst failure
In addition, the escaping ammonia will also pollute the environment and cause harm to human health and safety.

Method used

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  • Preparation method of ethanol-SCR catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The present embodiment prepares catalyst A, and concrete process is as follows:

[0027] (1) Put the honeycomb ceramic matrix into aluminum sol (solid content: 30wt%) for dip coating, then blow off the residual sol on the surface of the matrix and in the channels with compressed air, dry at 110°C for 3 hours, and bake at 600°C for 3 hours; Repeat the above process 2 times; the alumina coating coated on the honeycomb ceramic substrate accounts for 14% of the mass of the honeycomb ceramic substrate in terms of alumina;

[0028] (2) Put the material obtained in step (1) into a pressure-resistant container filled with ammonium bicarbonate aqueous solution (mass concentration: 17%), and carry out hydrothermal treatment at 130°C for 8 hours under airtight conditions to remove the residual liquid. Dry at 110°C for 6 hours, and bake at 500°C for 4 hours to obtain a coated honeycomb ceramic substrate; the mass ratio of the material obtained in step (1) to the ammonium bicarbonat...

Embodiment 2

[0032] The present embodiment prepares catalyst B, and concrete process is as follows:

[0033] (1) The process is the same as in Example 1; the alumina coating coated on the honeycomb ceramic substrate accounts for 18% of the mass of the honeycomb ceramic substrate in terms of alumina;

[0034] (2) Put the material obtained in step (1) into a pressure-resistant container filled with ammonium bicarbonate aqueous solution (mass concentration: 14%), and carry out hydrothermal treatment at 145°C for 6 hours under airtight conditions to remove the residual liquid. Dry at 110°C for 4 hours, and bake at 500°C for 4 hours to obtain a coated honeycomb ceramic substrate; the mass ratio of the material obtained in step (1) to the ammonium bicarbonate aqueous solution is 5:21;

[0035] (3) The process was the same as in Example 1 to obtain catalyst B, wherein the silver content in catalyst B was 1.0 wt%.

Embodiment 3

[0037] The present embodiment prepares catalyst C, and specific process is as follows:

[0038] (1) The process is the same as in Example 1; the difference is that the aluminum sol dip coating process is repeated once; the alumina coating coated on the honeycomb ceramic substrate accounts for 10% of the mass of the honeycomb ceramic substrate in terms of alumina. %;

[0039] (2) Put the material obtained in step (1) into a pressure-resistant container filled with ammonium bicarbonate aqueous solution (mass concentration: 14%), and conduct hydrothermal treatment at 140°C for 7 hours under airtight conditions to remove the residual liquid. Dry at 110°C for 3 hours, and bake at 500°C for 4 hours to obtain a coated honeycomb ceramic substrate; the mass ratio of the material obtained in step (1) to the ammonium bicarbonate aqueous solution is 1:6;

[0040] (3) The process was the same as in Example 1 to obtain catalyst C, wherein the silver content in catalyst C was 0.8wt%.

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Abstract

The invention discloses a preparation method of an ethanol-SCR catalyst. The method comprises the following steps: putting a honeycomb ceramic matrix into an aluminum oxide coating precursor for dip coating, then removing residual liquid on the surface of the matrix and in pore channels, drying and roasting; repeating the process; then carrying out hydro-thermal treatment by using an ammonium bicarbonate aqueous solution under a closed condition, removing residual liquid, drying and roasting; and loading active metal silver to obtain the ethanol-SCR catalyst. Active components on the catalystprepared by the method can be better anchored with a coating carrier, and meanwhile, a certain number of accumulation pore channels are formed in the surface of the coating so that the influence of fly ash in flue gas and carbon deposition of the catalyst in the reaction process can be reduced to a certain extent. The catalyst prepared by the method is especially suitable for a selective catalyticreduction process taking ethanol as a reducing agent.

Description

technical field [0001] The invention belongs to the technical field of nitrogen oxide removal, and in particular relates to a preparation method of an ethanol-SCR catalyst. Background technique [0002] SCR (Selective Catalytic Reduction) - selective catalytic reduction is currently the most widely used flue gas denitrification technology in the world. It has the advantages of high removal efficiency, simple device structure, reliable operation, and easy maintenance. This method mainly uses ammonia as the reducing agent, but due to the incomplete reaction of ammonia in the flue gas denitrification process, NH 3 -Ammonia escape will occur in the SCR denitrification process; at the same time, the active components of the SCR catalyst can also make SO in part of the flue gas 2 Oxidation to SO 3 , the SO produced by the reaction 3 It further reacts with the escaped ammonia in the flue gas to form ammonium bisulfate, which is a highly viscous substance. At the normal operatin...

Claims

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Application Information

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IPC IPC(8): B01J23/52B01D53/56B01D53/86
CPCB01J23/52B01D53/56B01D53/86B01D2258/0283Y02T10/12
Inventor 刘淑鹤王学海王宽岭汪鹏
Owner CHINA PETROLEUM & CHEM CORP
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