SCR denitration catalyst and preparation method thereof

A denitration catalyst and catalyst technology, which are used in catalyst activation/preparation, chemical instruments and methods, chemical elements of heterogeneous catalysts, etc., can solve the problems of narrow activity temperature window and poor low temperature activity, and achieve wide denitration temperature window, good Effect of medium and low temperature denitration activity

Inactive Publication Date: 2017-11-24
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a kind of SCR denitrification catalyst and its preparation method, described this SCR denitrification catalyst and its preparation method to solve the commercial vanadium tungsten titanium SCR denitrification catalyst in the prior art Technical problems of narrow activity temperature window and poor activity at low temperature

Method used

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  • SCR denitration catalyst and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0019] Step 1, make soluble cerium salt, soluble tungsten salt and soluble titanium salt into an aqueous solution according to the molar ratio of cerium, tungsten and titanium elements at 20:10:100, and add urea to control urea / (Ce+W+Ti) The molar ratio was 5.0.

[0020] Step 2: Put the mixed solution obtained in Step 1 in a water bath, and conduct a hydrothermal treatment at a water bath temperature of 90°C for 10 hours to promote the complete precipitation of cerium, tungsten, and titanium ions.

[0021] In step 3, the hydrothermal precipitate obtained in step 2 was filtered, washed, dried at 105 °C for 30 min, and then calcined in a muffle furnace at 550 °C for 5 h under air atmosphere to obtain catalyst A.

Embodiment 2

[0023] Step 1, soluble cerium salt, soluble tungsten salt and soluble titanium salt are made into aqueous solution according to the molar ratio of cerium element, tungsten element and titanium element at 20:10:100, and add 1ml H 2 o 2 solution (1 mol / L), control H 2 o 2 The molar ratio of titanium ions to the solution is 10:100; urea is finally added to control the molar ratio of urea / (Ce+W+Ti) to 5.0.

[0024] Step 2: Put the mixed solution obtained in Step 1 in a water bath, and conduct a hydrothermal treatment at a water bath temperature of 90°C for 10 hours to promote the complete precipitation of cerium, tungsten, and titanium ions.

[0025] In step 3, the hydrothermal precipitate obtained in step 2 was filtered, washed, dried at 105 °C for 30 min, and then calcined in a muffle furnace at 550 °C for 5 h under air atmosphere to obtain catalyst B.

Embodiment 3

[0027] Step 1, make soluble cerium salt, soluble tungsten salt and soluble titanium salt into an aqueous solution according to the molar ratio of cerium, tungsten and titanium elements at 20:10:100, and add 2 ml H 2 o 2 solution (1 mol / L), control H 2 o 2 The molar ratio of titanium ions to the solution is 20:100; urea is finally added to control the molar ratio of urea / (Ce+W+Ti) to 5.0.

[0028] Step 2: Put the mixed solution obtained in Step 1 in a water bath, and conduct a hydrothermal treatment at a water bath temperature of 90°C for 10 hours to promote the complete precipitation of cerium, tungsten, and titanium ions.

[0029] In step 3, the hydrothermal precipitate obtained in step 2 was filtered, washed, dried at 105 °C for 30 min, and then calcined in a muffle furnace at 550 °C for 5 h in an air atmosphere to obtain catalyst C.

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Abstract

The invention discloses an SCR denitration catalyst. Cerium, tungsten and titanium are taken as active elements of the catalyst, and the molar ratio of cerium, tungsten and titanium is (5-30):(1-20):100. The invention also provides a preparation method of the SCR denitration catalyst. The preparation method comprises the following steps: dissolving soluble cerium salt, soluble tungsten salt and soluble titanium at the molar ratio (cerium, tungsten and titanium) of (5-30):(1-20):100, and then adding a H2O2 solution to obtain a mixed solution; and selecting excessive urea as a precipitator, performing hydrothermal treatment for a certain period of time to promote cerium, tungsten and titanium ions to be completely deposited, and filtering, washing, drying and calcining the obtained deposition product to obtain the SCR denitration catalyst. H2O2 complexing modification can improve the low-and-medium-temperature NH3-SCR denitration activity in a cerium-tungsten-titanium composite oxide catalyst, the preparation method is simple and feasible, and the SCR denitration catalyst is suitable for a selective catalytic reduction and denitration process of NOx.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a catalyst, in particular to an SCR denitration catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO x ) is one of the main pollutants in the atmosphere, which can cause photochemical pollution, acid rain and other hazards. What we usually call nitrogen oxides mainly include NO and NO 2 , in which NO will combine with hemoglobin in the blood, reducing the ability of the blood to transport oxygen, thus causing hypoxia; in addition, NO is also carcinogenic. NO in the atmosphere slowly oxidizes to NO 2 , NO 2 It is the precursor of nitric acid and nitrous acid, which will form acid rain, acid rain and photochemical smog will cause large areas of crops and forests to die, and corrode buildings; NO 2 Entering the airways can also cause lung and bronchial disease and even death. In view of such hazards, the effective removal of NO x It has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J37/03B01J37/08B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/002B01J23/30B01J37/031B01J37/082B01J2523/00B01J2523/3712B01J2523/47B01J2523/69
Inventor 熊志波刘晶涂艳武金晶孙成喜项博超忻逸飞
Owner UNIV OF SHANGHAI FOR SCI & TECH
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