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Denitrification catalyst, preparation method and application of double oxide rice husk ash carrier supported by honeycomb ceramics

A technology of denitrification catalyst and double oxide, which is applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. It can solve the problem of easy loss of catalyst, high temperature instability, and difficult recovery and other issues, to achieve the effect of large industrial development potential, wide temperature window, and high denitrification rate

Active Publication Date: 2021-06-22
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Second, vanadium-titanium catalysts are commonly used denitration catalysts in industry, but V 2 o 5 It is a highly toxic substance, which is prone to sublimation or shedding during the reaction process, which not only reduces the activity of the catalyst, but also threatens human health
Although the commonly used noble metal catalysts show high activity in catalytic denitrification, they are limited by their scarcity, high temperature instability, easy poisoning and high price.
[0006] Third, the current research on SCR denitrification catalysts mainly focuses on the composition of the active components of the catalyst, but these studies mainly use powder or granular catalysts, which have problems such as easy loss of catalysts, short service life, and difficulty in recycling. The catalyst cannot be placed directly in the flue, it must be processed into a certain shape or loaded on a support

Method used

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  • Denitrification catalyst, preparation method and application of double oxide rice husk ash carrier supported by honeycomb ceramics
  • Denitrification catalyst, preparation method and application of double oxide rice husk ash carrier supported by honeycomb ceramics
  • Denitrification catalyst, preparation method and application of double oxide rice husk ash carrier supported by honeycomb ceramics

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Embodiment 1

[0040] A denitrification catalyst for double oxide rice husk ash supported by honeycomb ceramics, the components of which include: 20mm×20mm×15mm cordierite honeycomb ceramics with a porosity greater than 20%, 10g of rice husk ash, 300mL of deionized water, 1g urea with a mass fraction of 3%, 30mL alkaline silica sol with a mass fraction >30%, 1g sodium carboxymethylcellulose with a mass fraction of 1%, 1g polyethylene glycol with a mass fraction of 1%, 0.1g spit Wen-20, 6.7333g ferric nitrate nonahydrate, 2.0133g copper nitrate trihydrate.

[0041] The preparation method of the denitration catalyst of the above-mentioned honeycomb ceramic loaded double oxide rice husk ash carrier, the steps are as follows:

[0042] (1) Pretreatment of cordierite honeycomb ceramic matrix

[0043] The cordierite matrix was put into distilled water, cleaned by ultrasonic for 0.5 h, and then dried in an oven for use at 100° C. for 24 h.

[0044] (2) Preparation of rice husk ash slurry

[0045]...

Embodiment 2

[0053] A denitrification catalyst for double oxide rice husk ash supported by honeycomb ceramics, the components of which include: 20mm×20mm×15mm cordierite honeycomb ceramics with a porosity greater than 20%, 10g of rice husk ash, 300mL of deionized water, 2g of urea with a mass fraction of 3%, 40mL of alkaline silica sol with a mass fraction of >30%, 3.5g of sodium carboxymethylcellulose with a mass fraction of 1%, 3.5g of polyethylene glycol with a mass fraction of 1%, 0.3 g Tween-20, 6.7333g ferric nitrate nonahydrate, 2.0133g copper nitrate trihydrate.

[0054] The preparation method of the denitration catalyst of the above-mentioned honeycomb ceramic loaded double oxide rice husk ash carrier, the steps are as follows:

[0055] (1) Pretreatment of cordierite honeycomb ceramic matrix

[0056] The cordierite substrate was put into distilled water, cleaned by ultrasonic for 0.75h, and then dried in an oven for later use. The drying temperature was 110°C and the drying time ...

Embodiment 3

[0066] A denitrification catalyst for double oxide rice husk ash supported by honeycomb ceramics, the components of which include: 20mm×20mm×15mm cordierite honeycomb ceramics with a porosity greater than 20%, 10g of rice husk ash, 250mL of deionized water, 3g of urea with a mass fraction of 3%, 40mL of alkaline silica sol with a mass fraction of >30%, 7.5g of sodium carboxymethylcellulose with a mass fraction of 1%, 7.5g of polyethylene glycol with a mass fraction of 1%, 0.5 g Tween-20, 6.7333g ferric nitrate nonahydrate, 2.0133g copper nitrate trihydrate.

[0067] The preparation method of the denitration catalyst of the above-mentioned honeycomb ceramic loaded double oxide rice husk ash carrier, the steps are as follows:

[0068] (1) Pretreatment of cordierite honeycomb ceramic matrix

[0069] The cordierite matrix was put into distilled water, cleaned by ultrasonic for 1 h, and then dried in an oven for use at 120° C. for 10 h.

[0070] (2) Preparation of rice husk ash s...

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Abstract

The invention discloses a denitration catalyst, a preparation method and application of a honeycomb ceramic-supported double oxide rice husk ash carrier, and belongs to the technical field of nitrogen oxide reduction catalyst preparation; the catalyst uses cordierite honeycomb ceramics as a framework material, and Fe-Cu The transition metal double oxide is used as the active component, and the rice husk ash is used as the carrier of the active component; the catalyst of the invention not only improves the activity of the catalyst, widens the active temperature window, realizes the "ammonia-free SCR" technology, and uses rice husks. The ash supports transition metal double oxide, the catalyst cost is low, and the dual effects of simultaneous catalytic decomposition of NOx and CO oxidation are realized; the use of cordierite honeycomb ceramics as the matrix improves the mechanical stability of the catalyst carrier. The actual test results show that when the airspeed is 11200h ‑1 , the temperature range is from room temperature to 500 °C, O 2 The content is 0~10%, Fe 2 Cu 1 / Rice husk ash catalyst catalyzes CO‑SCR, NO to N conversion 2 The conversion rate is consistently higher than 99%.

Description

technical field [0001] The invention belongs to the technical field of preparation of nitrogen oxide reduction catalysts, and in particular relates to a denitrification catalyst, a preparation method and an application of a double oxide rice husk ash carrier supported by honeycomb ceramics, in particular to a method for reducing nitrogen oxides in flue gas at room temperature to ~ Catalyst, preparation method and application of highly efficient selective catalytic reduction in a wide temperature range of 500°C. Background technique [0002] Nitrogen oxides (NO X ) is the main air pollutant. Reducing NOx emissions has always been a research hotspot at home and abroad. The control measures can be divided into two types. The first is combustion process control, that is, reducing the formation of nitrogen oxides during the combustion process; The second type is for post-treatment, that is, denitrification of flue gas after combustion. Selective catalytic reduction (SCR) is cur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/745B01J23/78B01J35/04B01J37/02B01D53/86B01D53/56
CPCB01J23/745B01J23/78B01J23/002B01J37/0201B01D53/8625B01D2258/0283B01J2523/00B01J35/56B01J2523/13B01J2523/17B01J2523/22B01J2523/23B01J2523/31B01J2523/41B01J2523/842
Inventor 李娜潘雨晴周屈兰滕召晖
Owner XI AN JIAOTONG UNIV