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Use of aqueous guanidinium formiate solutions for the selective catalytic reduction of nitrogen oxides in exhaust gases of vehicles

A technology of nitrogen oxide and guanidine formate, which is applied in the direction of exhaust equipment, gas treatment, exhaust treatment, etc., to achieve the effect of reducing the risk of corrosion

Inactive Publication Date: 2012-02-29
ALZCHEM AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantageously, at the same time very corrosive formic acid is released and possible reverse formation of ammonium formate on the surface of the SCR-catalyst at exhaust gas temperatures below 250 °C

Method used

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  • Use of aqueous guanidinium formiate solutions for the selective catalytic reduction of nitrogen oxides in exhaust gases of vehicles
  • Use of aqueous guanidinium formiate solutions for the selective catalytic reduction of nitrogen oxides in exhaust gases of vehicles
  • Use of aqueous guanidinium formiate solutions for the selective catalytic reduction of nitrogen oxides in exhaust gases of vehicles

Examples

Experimental program
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Embodiment 1

[0037] corresponding to the basis figure 1 Description of the use of 40% by weight guanidine formate in automatic ammonia generators Aqueous solution, (GF) (Fp

[0038] Car engine 1 produces 200Nm 3 / h exhaust gas flow, which is led through the intermediate pipe 2 to the exhaust gas intermediate pipe 6 via the platinum oxidation catalyst 3 and the particle filter 4 . The composition of exhaust gas measured with FTIR-gas analyzer 5 in intermediate pipe 6: nitrogen oxide (NO) of 150ppm; nitrogen dioxide (NO2) of 150ppm 2 ); 7% of carbon dioxide (CO 2 ); 8% of water vapor, 10ppm of carbon monoxide (CO).

[0039] In the storage tank 7 there is the GF-solution 8 , which is sprayed into the reactor 11 by means of the metering pump 9 via the delivery pipe 10 and the nozzle 12 . The reactor 11 consists of a vertically arranged tube of an inner diameter of 51 mm made of austenitic stainless steel heated to 250° C. and provided with a heating jacket 15 . In reactor 11 there ar...

Embodiment 2

[0044] Similar to embodiment 1 operation, but titanium dioxide catalyst 14 is replaced by palladium oxide-titania catalyst, wherein titanium dioxide is replaced with Pd(NO 3 ) 2 The aqueous solution impregnated such that after drying and calcination (5 hours at 500° C.) a catalyst containing 1% by weight of PdO (= about 0.9% by weight of Pd) was produced and which resulted in partial oxidation of carbon monoxide. On the FTIR gas analyzer 17 no increase in the CO concentration can be detected.

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Abstract

The invention relates to the use of aqueous guanidinium formiate solutions, optionally combined with urea and / or ammonia and / or ammonium salts, for the selective catalytic reduction of nitrogen oxidesusing ammonia in exhaust gases of vehicles. The inventive guanidinium formiate solutions enable a reduction of the nitrogen oxides by appoximately 90 %. Furthermore, said guanidinium formiate solutions can enable an increase in the ammonia forming potential from 0.2 kg, corresponding to prior art, up to 0.4 kg ammonia per litre of guanidinium formiate, along with freezing resistance (freezing point below -25 DEG C). The risk of corrosion of the inventive guanidinium formiate solutions is also significantly reduced compared to that of solutions containing ammonium formiate.

Description

technical field [0001] The invention relates to the use of an aqueous guanidine formate solution for the selective catalytic reduction of nitrogen oxides in vehicle exhaust gases, wherein ammonia is produced from the corresponding guanidine formate solution by evaporation and catalytic decomposition and is used as reducing agent for the subsequent Selective catalytic reduction of nitrogen oxides. Background technique [0002] According to prior art, ammonia (NH 3 ) is used as reducing agent in the selective catalytic reduction of nitrogen oxides in vehicle exhaust gases, which is introduced into the In the exhaust tracts of combustion systems and internal combustion engines, in particular in the exhaust tracts of internal combustion engines of vehicles, and in SCR catalysts, the reduction of nitrogen oxides contained in the exhaust gas is initiated. SCR means nitrogen oxides (NO x ) selective catalytic reduction in the presence of oxygen. [0003] For the production of a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/94B01D53/90F01N3/20
CPCB01D2257/404B01D2255/20707F01N3/2066F01N2240/25Y02T10/24B01D53/9477B01D2255/1023B01D2251/206B01D2251/106B01D53/9418B01D2255/106F01N2610/02Y02A50/20B01D53/90B01D53/94F01N3/20F01N3/10Y02T10/12
Inventor B·哈莫尔H-P·克里米尔B·舒尔茨E·雅各布
Owner ALZCHEM AG