Method for preparing cerium, molybdenum and cobalt composite oxide selective denitration catalyst from dimethylamine

A composite oxide and denitrification catalyst technology, which is applied in the field of catalyst preparation, can solve the problems of widening catalyst operating temperature, low NOx removal rate, poor resistance to sulfur and water, etc., and achieves good industrial application prospects, strong anti-poison performance, The effect of wide operating temperature

Inactive Publication Date: 2016-04-20
ZHEJIANG UNIV
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Problems solved by technology

However, there is no literature or related papers on the preparation of cerium-molybdenum-cobalt composite oxide selective denitration catalysts using dimethylamine.
[0007] Patent CN104815645A discloses a W-Mn-Ti composite oxide SCR catalyst, which has an amorphous structure and good low-temperature activity, but slightly poor anti-sulfur and water resistance; The SCR catalyst still has the performance of purifying NOx at low temperature. The preparation process is simple and easy, but the NOx removal rate is not high, the highest is only 92%. Supported medium-temperature SCR catalyst with additives and titanium-zirconium oxide as the carrier has good reducibility and thermal stability, but the NOx removal rate is not high, and the operating temperature of the catalyst needs to be broadened

Method used

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  • Method for preparing cerium, molybdenum and cobalt composite oxide selective denitration catalyst from dimethylamine
  • Method for preparing cerium, molybdenum and cobalt composite oxide selective denitration catalyst from dimethylamine
  • Method for preparing cerium, molybdenum and cobalt composite oxide selective denitration catalyst from dimethylamine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Weigh 21.7g of Ce(NO 3 ) 3 ·6H 2 O, 1.77g of (NH 4 ) 6 Mo 7 o 24 4H 2 O and 0.728g of Co(NO 3 ) 2 ·6H 2 O, dissolved in 100 mL of deionized water (molar ratio Ce: Mo: Co = 1: 0.2: 0.05), magnetically stirred until completely dissolved;

[0034] (2) Place the obtained clear liquid in a heat-collecting stirrer, keep the temperature at 90° C., slowly add 25% ammonia water dropwise, adjust the pH to 12, stop the dropwise addition, and stir and age at room temperature for 4 hours;

[0035] (3) Centrifuge the obtained suspension, and dry the lower part of the precipitate at 110°C for 8 hours;

[0036] (4) The material obtained in (3) was calcined at 400°C for 4h, ground, and passed through a 200-mesh sieve to obtain CeMo x co y o z Composite oxide type SCR catalyst;

[0037] Characterized by BET, the prepared CeMo 0.2 co 0.05 o z (5 and 10 are Mo / Ce molar ratio and Co / Ce molar ratio respectively, and z is the number of oxygen atoms) The specific surface a...

Embodiment 2

[0047] (1) Weigh 0.356g of Ce 2 (SO 4 ) 3 ·8H 2 O, 0.0887g of Mo(NO 3 ) 3 ·5H 2 O and 28.5 g of CoSO 4 ·7H 2 O, dissolved in 100 mL of deionized water (molar ratio Ce: Mo: Co = 1: 0.2: 100), magnetically stirred until completely dissolved;

[0048] (2) Place the obtained clear liquid in a heat-collecting stirrer, keep the temperature at 80° C., slowly add the urea solution dropwise, adjust the pH to 11, stop the dropwise addition, and stir and age at room temperature for 3 hours;

[0049] (3) Centrifuge the resulting suspension, and dry the lower part of the precipitate at 100°C for 10 hours;

[0050] (4) The material obtained in (3) was calcined at 500°C for 5h, ground, and passed through a 200-mesh sieve to obtain CeMo x co y o z Composite oxide type SCR catalyst;

[0051] Characterized by BET, the prepared CeMo 0.2 co 100 o z The specific surface area of ​​the powder catalyst is 159m 2 / g.

[0052] The catalytic activity of the catalyst was evaluated in a f...

Embodiment 3

[0056] (1) Weigh 0.373g of CeCl 3 ·7H 2 O, 27.3g of MoCl 5 and 0.0119g of CoCl 2 ·6H 2 O, dissolved in 100 mL of deionized water (molar ratio Ce: Mo: Co = 1: 100: 0.05), magnetically stirred until completely dissolved;

[0057] (2) Place the obtained clear liquid in a heat-collecting stirrer, keep the temperature at 30°C, slowly add ammonium carbonate solution dropwise, adjust the pH to 8, stop the dropwise addition, and stir and age at room temperature for 4 hours;

[0058] (3) Centrifuge the obtained suspension, and dry the lower part of the precipitate at 120°C for 9 hours;

[0059] (4) The material obtained in (3) was calcined at 600°C for 7 hours, ground, and passed through a 200-mesh sieve to obtain CeMo x co y o z Composite oxide type SCR catalyst;

[0060] Characterized by BET, the prepared CeMo 100 co 0.05 o z The specific surface area of ​​the powder catalyst is 176m 2 / g.

[0061] The catalytic activity of the catalyst was evaluated in a fixed bed react...

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Abstract

The invention relates to the technical of preparation of a catalyst and aims to provide a method for preparing a cerium, molybdenum and cobalt composite oxide selective denitration catalyst from dimethylamine. The method comprises steps as follows: soluble cerium salt, cobalt salt and molybdenum salt are added to deionized water and are sufficiently dissolved under magnetic stirring; an obtained solution is poured into a heat-collecting stirrer, an ammonium solution is dropwise added at a constant temperature to adjust the pH value, and then the solution is stirred and aged at the room temperature; the obtained mixture is subjected to centrifugal treatment, obtained solids are dried, calcined, cooled, ground and sieved, and a product is obtained. The catalyst can work in a larger temperature range and has high activity, high anti-toxicity performance and high N2 selectivity; dimethylamine is taken as a reducing agent, a large quantity of ammonium resources can be saved, and the effect of treatment of waste with waste is realized; the catalyst is prepared with a coprecipitation method, is simple, easy to implement and low in cost and has good industrial application prospect.

Description

technical field [0001] The invention relates to catalyst preparation technology, in particular to a method for preparing a cerium-molybdenum-cobalt composite oxide selective denitration catalyst with dimethylamine. Background technique [0002] In recent years, as the type of acid rain has changed from sulfuric acid to mixed sulfuric acid and nitric acid, the state has increasingly stringently controlled nitrogen oxides. Nitrogen oxides (NOx) are NO, NO 2 , N 2 O and N 2 o 5 The general designation of a series of compounds, such as , is extremely harmful to the environment. In the newly released "Emission Standard of Air Pollutants for Thermal Power Plants" (GB13223-2011), the nitrogen oxides of coal-fired boilers (in NO 2 meter) emission limit is strict to 100mg / m 3 . my country began to vigorously study SCR technology in the 1990s and achieved remarkable results. At present, most of the denitrification units in China use SCR technology. The reducing agent is usually ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/882B01D53/86
CPCB01J23/8871B01D53/8628B01D2255/40B01D2257/40B01D2258/0283B01J23/002B01J2523/00B01J2523/3712B01J2523/68B01J2523/845
Inventor 赵伟荣陈梦霞陈金胜
Owner ZHEJIANG UNIV
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