Thin-wall flat plate type low-temperature sulfur-resistant SCR denitration catalyst and preparation method thereof

A denitrification catalyst, a flat-plate technology, applied in the field of environmental protection technology and denitrification catalysis, can solve the problems of poor low-temperature activity and ammonium sulfate poisoning, and achieve the effects of overcoming poor mechanical properties, saving usage, and improving activity

Active Publication Date: 2020-09-29
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0005] The present invention aims at the technical problem that the SCR denitrification catalyst in the prior art has poor low-temperature activity and is prone to ammonium sulfate poisoning. It has excellent anti-sulfur poisoning performance and stable low-temperature denitrification performance in atmospheric environment

Method used

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  • Thin-wall flat plate type low-temperature sulfur-resistant SCR denitration catalyst and preparation method thereof

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preparation example Construction

[0041] In order to better realize the above-mentioned technical solution, the present invention also provides a method for preparing a thin-walled plate-type low-temperature sulfur-resistant SCR denitration catalyst, the specific steps including:

[0042] S1. Preparation of TiO 2 -Nb 2 o 5 -Fe 2 o 3 composite nanocarrier

[0043] Prepare titanium tetrachloride solution with cold water, add monoglyceride stearate and stir evenly, adjust the pH value to 6.5-7.5 with ammonia water, then heat the solution to 50°C to obtain a uniform white emulsion; then slowly add five Niobium chloride ethanol solution and ferric chloride solution, adjust the pH value to 8-9 with ammonia solution, heat the solution to 80°C, and keep stirring for 2-4h; wash the hydrolysis precipitate with ethanol and deionized water in turn, and finally roast Get TiO 2 -Nb 2 o 5 -Fe 2 o 3 Composite nanocarriers;

[0044] S2. Preparation of catalyst material

[0045] The prepared ammonium metavanadate, a...

Embodiment 1

[0053] This example provides a thin-walled flat-plate low-temperature sulfur-resistant SCR denitration catalyst and its preparation method. The specific steps include:

[0054] (1) Preparation of TiO 2 -Nb 2 o 5 -Fe 2 o 3 composite nanocarrier

[0055] Dissolve 2015.35g of titanium tetrachloride in 21.25L of water, 101.64g of niobium pentachloride in 276mL of ethanol, and 202.76g of ferric chloride in 417mL of water to obtain titanium solution, niobium solution and iron solution; add 38.1g Stearic acid monoglyceride, use ammonia water to adjust the pH of the solution to 6.5, and then heat the solution to 50°C to hydrolyze the titanium solution to obtain a uniform white emulsion; add niobium solution and iron solution to the emulsion in turn to adjust the pH of the solution to 8 , heated the solution to 80°C and kept stirring for 2h; filtered to obtain the hydrolyzed precipitate, washed with ethanol and deionized water, and roasted at 500°C for 10h to obtain 2 o 5 and 10...

Embodiment 2

[0069] Embodiment 2 also describes a thin-walled flat plate low-temperature anti-sulfur SCR denitration catalyst and its preparation method. The specific steps include:

[0070] (1) Preparation of TiO 2 -Nb 2 o 5 -Fe 2 o 3 composite nanocarrier

[0071] Dissolve 2015.35g of titanium tetrachloride in 7.08L of water, 203.28g of niobium pentachloride in 555mL of ethanol, and 101.38g of ferric chloride in 208mL of water to obtain titanium solution, niobium solution and iron solution; add 114.3g Stearic acid monoglyceride, use ammonia water to adjust the pH of the solution to 7.5, and then heat the solution to 50°C to hydrolyze the titanium solution to obtain a uniform white emulsion; add niobium solution and iron solution to the emulsion in turn to adjust the pH of the solution to 9 , heated the solution to 80°C and kept stirring for 4h; filtered to obtain the hydrolyzed precipitate, washed with ethanol and deionized water, and roasted at 650°C for 3h to obtain 2 o 5 and 5%...

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Abstract

The embodiment of the invention provides a thin-wall flat plate type low-temperature sulfur-resistant SCR denitration catalyst and a preparation method thereof. The catalyst is prepared by taking TiO2-Nb2O5-Fe2O3 composite nano oxide as a carrier, V2O5 as an active component and MoO3 and MnSO4 as active aids, adding organic and inorganic structural aids, and performing multi-stage rolling, dryingand the like. According to the catalyst disclosed by the invention, the low-temperature denitration performance and sulfur poisoning resistance are improved by developing a carrier for accelerating denitration reaction, promoting decomposition of ammonium sulfate salt, optimizing active ingredients and active aids, optimizing forming aids, a preparation process and the like so that the catalyst has excellent denitration activity and stability within a temperature range of 150-250 DEG C. Due to the plate thickness of 0.35-0.40 mm, the catalyst has relatively low sulfur dioxide oxidation rate and relatively strong sulfur poisoning resistance, the raw material cost required by production is greatly reduced, and the operation cost of an SCR denitration system is saved.

Description

technical field [0001] The invention belongs to the field of environmental protection technology and denitrification catalysis, and in particular relates to a thin-walled plate type low-temperature sulfur-resistant SCR denitrification catalyst. The invention also provides a preparation method of the thin-wall flat-plate type low-temperature sulfur-resistant SCR denitration catalyst. Background technique [0002] As the mainstream flue gas denitrification technology, SCR technology has been widely used in the field of domestic thermal power flue gas denitrification. However, with the increasingly stringent environmental protection requirements, in addition to the thermal power industry, many industries such as cement, glass, and metallurgy have gradually begun to use SCR denitrification catalysts to meet the NOx emission standards of their respective industries. [0003] As the demand for SCR denitrification catalysts becomes wider and wider, more complex and changeable flue...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/847B01J27/053B01J35/02B01J35/10B01J37/08B01J37/02B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/8474B01J27/053B01J35/02B01J35/10B01J37/0009B01J37/0018B01J37/0225B01J37/0236B01J2523/00B01J2523/47B01J2523/56B01J2523/842
Inventor 陆强吴洋文郑树周新越吴亚昌徐明新
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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