SU1659090A1 - Catalyst for reducing nitrogen oxides with ammonia - Google Patents

Abstract

This invention relates to catalytic chemistry, in particular to a catalyst for the reduction of nitrogen oxides with ammonia. The purpose of the invention is to increase the activity of the catalyst. In order to increase the activity, the catalyst contains the following ratio of components, wt.%: Metal complex of nitrogenous compounds (iron complex of neutral nitrogenous compounds of oil or cobalt complex of nitrogenous bases of oil) 0.5-10.0; alumina 90.0-99.5. 2 tab.

Description

The invention relates to the manufacture of catalysts and can be used to protect the atmosphere from pollution with nitrogen oxides.

The purpose of the invention is to increase the activity of the catalyst due to the content of the nitrogenous compounds of the iron or cobalt complex of the nitrogenous compounds of the oil as the metal complex.

Example 1.1.5g of neutral nitrogenous compounds (HAC) oil (H 9.1%, N 0.6%, 32.6%, 0 (p) 2.3%, C balance) are dissolved in 100 ml of chloroform. 0.05 g in 50 ml of acetone is added to the solution. The mixture is stirred for 15 minutes. The solution is evaporated, the complex is washed with acetone from excess salt and hexane from soluble organic compounds, brought to constant weight in a vacuum. Get Fe - / - complex US oil (m 450, H 7.2%, N 0.8%,

S 1.8%, Fe 5.6%, C 9.1% 0 (P) 12.4%, C 63.1%).

99.6 g of granulated alumina is poured with a solution containing 0.4 g of the obtained Fe – HAC complex oil in 100 ml of chloroform, stirred at room temperature for 15 minutes. Chloroform is evaporated, the impregnated alumina is dried to constant weight. Catalyst composition,% in May: FeCb 0.06, UAC 0.34; A1gOz 99.6.

Approx 2. 1.5 g of HAC (C 85.4%, H 9.1%, N 0.6%, S 2.6%, 0 {p) 2.3% are dissolved in 100 ml of chloroform. Further according to claim 1.

99.5 hl of granulated alumina is poured with a solution containing 0.5 g of the obtained Fe - HAC complex oil in 100 ml of chloroform. Further, according to claim 1. The composition of the catalyst, wt.%: FeCb 0.07. US 0.43%, 99.5%.

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Example.W. 1.5 HAC (C 85.3%, H9.1%, N 0.6%, S 2.6%, 0 (p) 2.3%) were dissolved in 100 ml of chloroform. Further according to claim 1.

94.0 g of granulated alumina is poured over with a solution containing 6 g of the obtained Fe - HAC complex oil in 100 ml of chloroform. Further according to claim 1. The composition of the catalyst, wt.%: 0,8, 5,2, 94 US.

Example 4.1.5 g IAC {C 85.3%, H 9.1%, N 0.6%, S 2.6% 0 (p) 2-3%) are dissolved in 100 ml of chloroform. Further item 1.

90 g of granulated alumina is poured with a solution containing 10 g of HAC oil obtained in HAC complex in 100 ml of chloroform. Further according to claim 1. Catalyst composition, wt.%: FeCIs 1.3: HAC 8.7, 90.

. Example 1.5 hNAC (C 85.3%, H9.1%, N0.6%, 52.6%, 0 (p) 2.3%) was dissolved in 100 ml of chloroform. Further according to claim 1.

88 g of granulated alumina is poured over with a solution containing 12 g of the obtained HAC oil complex in 100 ml of chloroform. Further according to claim 1. Catalyst composition, wt.%: FeCIs 1.6; US 10.4, 88.

Examples 6-11. The catalysts are obtained similarly to p. The resulting catalysts and the known ones were tested in the reduction of nitrogen oxides with ammonia at 20 and 200 ° C in a flow-through glass reactor with a diameter of 10 mm at atmospheric pressure and a gas mixture consumption of 50 l / g. The content of oxides in the gas mixture 1ob.%. The test results are presented in Table 1.

An example of 15.1.5 g of nitrogenous bases (AO) of oil (C 82.1%, H 9.6%, N 0.9%, S 2.3%, 0 (p) 5.2%) is dissolved in 100 ml of chloroform. To the solution was added 0.54 g CO 2 g in 50 ml of acetone. The solution is evaporated, the complex is washed with acetone from excess salt and hexane from soluble organic compounds, brought to constant weight in a vacuum. Co-complex of AO oil is obtained (m.m. 700, C 52.3%, H 7.4%, N 0.7%, S 1.8% Co11.0%, LPS, 2% .0 (p) 13.2%).

99.6 granulated alumina is poured with a solution containing 0.4 g of the obtained Co-complex AO oil, 100 ml of chloroform, stirred at room temperature for 15 minutes. Chloroform is evaporated. Impregnated alumina is dried to constant weight. Composition of catalyst, wt%: CoCte 0.1, AO 0.3, 99.6.

Example 16. 1.5 g of AO (C 82.1, H 9.6%, N 0.9, S 2.3%, 0 (p) 5.2%) are dissolved in 100 ml of chloroform. Further according to claim 1.

99.5 g of granulated alumina is poured with a solution containing 0.5 g of the obtained Co-complex AO oil in 100 ml of chloroform. Next by p. 15. The composition of the catalyst is wt.%: CoC (2 0.12; AO 0.38, Н20з 99.5.

 Example17. 1.5 gAO (C82.1%, H9.6%, 9%, N 2.3%, 0 (p) 5.2%) are dissolved in 100 ml of chloroform. Further according to claim 1.

94 g of granulated alumina is poured with a solution containing 6 g of the obtained Co-complex AO in 100 ml of chloroform. Further on p. 15. The composition of the obtained catalyst, wt.%: CoCte 1.45, JSC 4.55, A1203 94.

Example 18. 1.5 AO (C 82.1%, H 9.6%, N 0.9%, S 2.3% 0 (p) 5.2%) were dissolved in 100 ml of chloroform. Further according to claim 1.

90 g of granulated alumina is poured with a solution containing 10 g of the obtained Co-complex AO oil in 100 ml of chloroform. Further according to claim 15. The composition of the catalyst, wt.%: CoCIa 2.4, AO 7.6, A1203 90.

Example 19. 1.5 g of AO (C 82.1% .H 9.6%, N0.9%, S 2.3%, 0 (P) 5.2%) were dissolved in 100 m of chloroform. Further according to claim 1.

88 g of granulated alumina is poured with a solution containing 12 g of the obtained Co-complex AO oil in 100 ml of chloroform. Further on p. 15. The composition of the catalyst, wt.%: CoCl2 2.9, AO 9.1, A (20z 88.

Examples 20-25. The catalysts are obtained analogously to p. 15. The catalysts obtained and known are tested in the processes of reducing nitrogen oxides with ammonia at 20 and 200 ° C in a 10 mm diameter flow glass reactor at atmospheric pressure and a gas mixture flow rate of 50 l / g; .%. The test results are presented in table 2.

In accordance with the data in the table reflecting the influence of conditions on the catalytic activity of the proposed catalyst and the prototype catalyst in the process of purifying gases from nitrogen oxides, the proposed catalyst is characterized by a higher temperature of maximum decomposition rate, which allows its use in the process of purifying exhaust gases with temperature exceeding 250 ° C.

In addition, the proposed catalyst has a higher catalytic activity, which is confirmed by the test results, according to which the purification rate on the proposed catalyst is the same with the prototype achieved at much lower volumes and higher volumetric rates.

Claims A catalyst for reducing nitrogen oxides with ammonia, containing alumina and a metal complex of nitrogenous compounds in the following ratio of components, wt.%: A metal complex of nitrogenous compounds 0.5-10.0, alumina 90.0-99.5, characterized in that In order to increase the activity of the catalyst, it contains the iron complex of neutral nitrogen compounds of the oil or the cobalt complex of the nitrogen bases of the oil as the metal complex of nitrogenous compounds.

Table 1

table 2

Claims (1)

Claim A catalyst for the reduction of nitrogen oxides with ammonia, containing aluminum oxide and a metal complex of nitrogen compounds <5 in the following ratio of components, wt.%: Metal complex of nitrogen compounds 0.5-10.0, aluminum oxide 90.0-99.5, characterized in order to increase the activity of the catalyst, it contains an iron complex of neutral nitrogen compounds of oil or a cobalt complex of nitrogen bases of oil as a metal complex of nitrogen compounds. Table 1 Catalyst Example The content of the metal complex, wt.% The volume of catalyst, l Temperature, ⁷ C Degree of purification % Volumetric speed, h The process Maximum decomposition rate Proposed 1 0.4 0.004 20 5th 80 12500 2 0.5 Also Also 510 90 Also 3 6.0  - .11 ~ - h - 5th 90 - "1 - 4 10.0 _in II _ - and - 510 96 - and - 5 12.0 _ II - - h - 510 96 - II -. 6 0.4 _ II 200 510 96 - II - 7 0.5 _ || _ Also 510 98 - II - 8 6.0 Also Also 510 98 Also 9 10.0 _m II - - h - 510 99 "II -  '' 10 12.0 _ II- - h - 510 99 - Π - eleven 0.5 0.05 ^{20 510} 95 6000 Prototype 12 0.5 0.05 20 240 80 6000 thirteen 10.0 Also Tci 240 81 Also 14 0.5 - *1 - • 200 240 99.8 - II - table 2