Flue gas denitrification catalyst and its preparation method and application

A denitration catalyst and flue gas technology, applied in the field of denitration catalysts, can solve the problems of poor wear resistance of the coating, poor poisoning ability, easy decline in activity, etc., and achieve the effects of low cost, good thermal stability and environmental friendliness.

Active Publication Date: 2022-03-29
CHINA SHENHUA ENERGY CO LTD +2
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  • Abstract
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Problems solved by technology

[0003] At present, a lot of research has been done on non-vanadium-titanium-based denitrification catalysts in China. For example, the denitrification catalysts disclosed in patents CN104857950A, CN103240081B and CN103894186B are all based on manganese, and the obtained manganese-based denitrification catalysts have good low-temperature denitrification Activity, the shortcoming of this series of catalysts is the resistance to SO 2 Poor poisoning ability, which is also one of the main factors limiting its industrial application
The catalysts disclosed in patents CN10554581A and CN105032417A use precious metals as the main active components and are expensive
CN1401416 and CN1457920 disclose cordierite honeycomb ceramics as the support body and copper oxide as the main active component. The disadvantage of the catalyst prepared by this method is that the coating wear resistance is poor and the activity is easy to drop

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  • Flue gas denitrification catalyst and its preparation method and application

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preparation example Construction

[0037] The present invention also provides a method for preparing a flue gas denitrification catalyst, the method comprising:

[0038] 1) Mix solution A and solution B to obtain solution C, and then contact solution C with urea to obtain solution D;

[0039] 2) The solution D is heated, solid-liquid separated, and first dried to obtain catalyst powder;

[0040] 3) The catalyst powder and the filler are mixed and formed, secondly dried, and roasted to obtain a flue gas denitration catalyst,

[0041] Wherein, the solution A contains titanium salts and zirconium salts, and the solution B contains praseodymium salts, lanthanum salts, erbium salts, and tungsten salts, iron salts, cerium salts, gold salts, silver salts, and rhodium salts. one or more;

[0042] In terms of Ti / Zr elements, the molar ratio of the titanium salt to the zirconium salt is 1: (0.1-0.7);

[0043] In terms of Pr / La / Er elements, the molar ratio of the praseodymium salt, the lanthanum salt and the erbium sal...

Embodiment 1

[0064] (1) Preparation of precursor solution

[0065] With the molar ratio of Ti / Zr as 1:0.2, weigh 153.1g of titanyl sulfate and 61.7g of zirconium oxychloride, dissolve them in 500g of deionized water, and add 50ml of concentrated sulfuric acid with a mass fraction of 98% to the above solution , and stirred at 60 °C until a clear solution was obtained to obtain solution A. Weigh praseodymium nitrate, lanthanum nitrate, erbium nitrate, ammonium metatungstate, ferric chloride, cerium chloride, dissolve it in 500g deionized water, obtain solution B, wherein, the amount of each salt in solution B meets the following ratio, according to Relative to the total amount of titanium salt and zirconium salt contained in solution A in terms of oxides of each metal, the total amount of praseodymium salt, lanthanum salt and erbium salt contained in solution B in terms of oxides of each metal is 20 Mass %, the total amount of tungsten salt, iron salt and cerium salt contained in solution B...

Embodiment 2

[0073] (1) Preparation of precursor solution

[0074] With the molar ratio of Ti / Zr as 1:0.5, weigh 113.2g of titanyl sulfate and 114.0g of zirconium oxychloride, dissolve them in 500g of deionized water, and add 50ml of concentrated sulfuric acid with a mass fraction of 98% to the above solution , and stirred at 60 °C until a clear solution was obtained to obtain solution A. Weigh praseodymium nitrate, lanthanum nitrate, erbium nitrate, and ammonium tungstate, and dissolve them in 500g of deionized water to obtain solution B, wherein the amount of each salt in solution B satisfies the following proportions, calculated according to the oxides of each metal The total amount of the titanium salt and the zirconium salt contained in the solution A, the total amount of the praseodymium salt, the lanthanum salt and the erbium salt contained in the solution B in terms of the oxides of each metal is 25 mass%, and the oxides of each metal The tungsten salt contained in the calculated ...

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Abstract

The invention relates to the field of denitration catalysts, and discloses a flue gas denitration catalyst and its preparation method and application. The flue gas denitration catalyst includes metal composite oxides, and the metal composite oxides include titanium, zirconium, praseodymium, lanthanum and erbium Oxides, and optionally one or more oxides of tungsten, iron, cerium, gold, silver, and rhodium, wherein the molar ratio of titanium and zirconium in terms of elements is 1: (0.1 to 0.7); The molar ratio of praseodymium, lanthanum and erbium in terms of elements is 1:(0.1~2):(0.01~1); the molar ratio of tungsten, iron, cerium, gold, silver and rhodium in terms of elements is 1:(0~ 10): (0-10): (0-0.03): (0-0.03): (0-0.03); the total amount of oxides of praseodymium, lanthanum and erbium relative to the total amount of oxides of titanium and zirconium The total amount of oxides of tungsten, iron, cerium, gold, silver and rhodium is 0.1 to 15 mass%. The flue gas denitrification catalyst of the invention can realize high-efficiency denitrification in a large temperature span range, has low cost, and has good thermal stability.

Description

technical field [0001] The invention relates to the field of denitrification catalysts, in particular to a flue gas denitrification catalyst and its preparation method and application. Background technique [0002] Nitrogen oxides (NO x ) is one of the main causes of acid rain, smog, and photochemical smog. Our country is NO x The largest emitter, the main sources include thermal power plants, motor vehicle exhaust, and cement plants. With the increasingly stringent requirements for NOx emission limits in the industrial field, NO x governance is imminent. Selective catalytic reduction (Selective Catalytic Reduction, SCR) is currently the most mature and effective denitrification method, and has become the current domestic and foreign treatment of NO x The mainstream technology and development direction. The core of SCR denitrification technology is the catalyst. Currently, commercial SCR catalysts are mainly V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 system, due to V 2 o 5 T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01J23/888B01J23/68B01J23/652B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01J23/002B01J23/6527B01J23/687B01J23/888B01J23/8993B01D2255/20715B01D2255/20738B01D2255/20776B01D2255/1025B01D2255/20707B01D2255/206B01D2255/2063B01D2255/2065B01D2255/2066B01D2255/104B01D2255/106B01J2523/00B01J2523/47B01J2523/48B01J2523/3718B01J2523/3706B01J2523/3775B01J2523/3712B01J2523/69B01J2523/842B01J2523/18B01J2523/19B01J2523/822
Inventor 祝社民肖国振李涛李波金忠安沈岳松李喜红
Owner CHINA SHENHUA ENERGY CO LTD
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