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Low-temperature cerium-based sulfur-resistant and water-resistant denitration catalyst and preparation method thereof

A denitrification catalyst, cerium-based technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as increased energy consumption and equipment investment, physical damage to catalysts, poor resistance to sulfur and water, and achieve Reproducible, performance-boosting, easy-to-manipulate effects

Active Publication Date: 2021-03-26
TIANJIN CEMENT IND DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high dust content in the three processes of high-temperature and high-dust arrangement, high-temperature and medium-dust arrangement, and medium-temperature and medium-dust arrangement, irreversible physical damage may be caused to the catalyst. Good activity and stability, but toxicity exists in the production process and subsequent processing
The existing low-temperature and low-dust arrangement in the cement industry usually places the SCR reactor behind the bag filter, and the flue gas temperature at the outlet of the bag filter is lower than 150°C, while the applicable temperature of the vanadium-titanium-based catalyst exceeds 150°C. Based on the catalyst, the flue gas needs to be reheated before entering the denitrification device, which increases energy consumption and equipment investment
[0003]The existing rare earth cerium-based and manganese-zirconium composite oxide denitrification catalysts have good denitrification effect at low temperature, but poor sulfur and water resistance

Method used

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  • Low-temperature cerium-based sulfur-resistant and water-resistant denitration catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) A kind of preparation of cerium oxide

[0028] ①Dissolve 13.95g of cerium nitrate in 45mL of deionized water, and magnetically stir for 30 minutes at room temperature to obtain a cerium nitrate solution;

[0029] ②Dissolve 4.05g of cetyltrimethylammonium bromide in 30mL of deionized water, then add 36mL of ammonia water, and stir for 30 minutes;

[0030] ③ Slowly add the cerium nitrate solution prepared in step ① into the solution prepared in step ②, stir magnetically for 30 minutes at room temperature, transfer it to a 200mL hydrothermal reaction kettle, place it in an oven with a heating condition of 130°C, and a synthesis time of 15 hours;

[0031] ④The sample obtained in step ③ is subjected to suction filtration and water washing to remove other impurity ions. The obtained solid sample is placed in an oven with a heating condition of 80°C and a drying time of 5 hours. The dried sample is placed in a muffle furnace for roasting. The temperature is 500°C, the cal...

Embodiment 2

[0038] (1) A kind of preparation of cerium oxide

[0039] ①Dissolve 13.95g of cerium nitrate in 45mL of deionized water, and magnetically stir for 30 minutes at room temperature to obtain a cerium nitrate solution;

[0040] ②Dissolve 4.05g of cetyltrimethylammonium bromide in 30mL of deionized water, then add 36mL of ammonia water, and stir for 30 minutes;

[0041] ③ Slowly add the cerium nitrate solution prepared in step ① into the solution prepared in step ②, stir magnetically for 30 minutes at room temperature, transfer it to a 200mL hydrothermal reaction kettle, place it in an oven with a heating condition of 130°C, and a synthesis time of 15 hours;

[0042] ④The sample obtained in step ③ is subjected to suction filtration and water washing to remove other impurity ions. The obtained solid sample is placed in an oven with a heating condition of 80°C and a drying time of 5 hours. The dried sample is placed in a muffle furnace for roasting. The temperature is 500°C, the cal...

Embodiment 3

[0049] (1) A kind of preparation of cerium oxide

[0050] ①Dissolve 13.95g of cerium nitrate in 45mL of deionized water, and magnetically stir for 30 minutes at room temperature to obtain a cerium nitrate solution;

[0051] ②Dissolve 4.05g of cetyltrimethylammonium bromide in 30mL of deionized water, then add 36mL of ammonia water, and stir for 30 minutes;

[0052] ③ Slowly add the cerium nitrate solution prepared in step ① into the solution prepared in step ②, stir magnetically for 30 minutes at room temperature, transfer it to a 200mL hydrothermal reaction kettle, place it in an oven with a heating condition of 130°C, and a synthesis time of 15 hours;

[0053] ④The sample obtained in step ③ is subjected to suction filtration and water washing to remove other impurity ions. The obtained solid sample is placed in an oven with a heating condition of 80°C and a drying time of 5 hours. The dried sample is placed in a muffle furnace for roasting. The temperature is 500°C, the cal...

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Abstract

The invention relates to a low-temperature cerium-based sulfur-resistant water-resistant denitration catalyst and a preparation method thereof, the denitration catalyst comprises a carrier, an activecomponent precursor and an auxiliary agent, and the mass ratio of the carrier to the active component precursor to the auxiliary agent is 50-100: 60-120: 1-2; wherein the active component precursor comprises a component A, a component B and cerium oxide, and the mass ratio of the component A to the cerium oxide to the component B is (1-5): (1-3): (2-5); wherein the component A and the component Bare respectively selected from one of manganese acetate, zirconium acetate, ferric nitrate, nickel nitrate and chromium nitrate; and cerium oxide in the active component precursor is subjected to sulfation treatment; and a mixture of the raw materials is subjected to extrusion molding, and then carrying out drying and roasting so as to obtain the cerium-based sulfur-resistant water-tolerant denitration catalyst. The denitration catalyst provided by the invention has significantly improved sulfur resistance and water resistance, avoids the problem that flue gas needs to be heated due to low flue gas temperature, saves a large amount of resources and cost, and is relatively simple in preparation process and easy to realize large-scale mass production.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to a low-temperature cerium-based anti-sulfur and water-resistant denitrification catalyst and a preparation method thereof. Background technique [0002] A large amount of thermal NO is produced in the cement production process x and combustion NO x , directly discharged into the atmosphere will cause adverse effects on humans and the environment, so the kiln tail flue gas needs to be denitrified before being discharged. At present, the layout of SCR reactors in the domestic cement industry mainly includes four layout methods: high-temperature and high-dust layout, high-temperature medium-dust layout, medium-temperature and medium-dust layout, and low-temperature and low-dust layout. Due to the high dust content in the three processes of high-temperature and high-dust arrangement, high-temperature and medium-dust arrangement, and medium-temperature and medium-dust ar...

Claims

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Application Information

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IPC IPC(8): B01J27/053B01D53/86B01D53/56
CPCB01J27/053B01D53/8628B01D2258/0283
Inventor 李帅帅胡芝娟赵琳王永刚程兆环
Owner TIANJIN CEMENT IND DESIGN & RES INST
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