DE4125913C1 - - Google Patents
Info
- Publication number
- DE4125913C1 DE4125913C1 DE19914125913 DE4125913A DE4125913C1 DE 4125913 C1 DE4125913 C1 DE 4125913C1 DE 19914125913 DE19914125913 DE 19914125913 DE 4125913 A DE4125913 A DE 4125913A DE 4125913 C1 DE4125913 C1 DE 4125913C1
- Authority
- DE
- Germany
- Prior art keywords
- treated
- mixed solution
- volume
- catalyzer
- waste gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/06—Washing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/18—Carbon
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Herstellung eines Katalysators zur Entfernung von Stickstoffoxiden aus Abgasen unter Zuführung von Ammoniak, wobei der Katalysator aus einem kohlenstoffhaltigen Material besteht, das mit einer Mischlösung aus 5 bis 20%iger, insbesondere 5 bis 15 %iger HCl und 1 bis 8%iger, insbesondere 2 bis 4%iger HNO₃ bei einer Kontaktzeit von 5 bis 60 min behandelt und nach Ablassen der Mischlösung bei 200°C oder höher in einem N₂-Strom getrocknet wird und wobei das Abgas aus der N₂-Behandlung kondensiert und im Kreislauf zurückgeführt wird. Mit den nach diesem aus der DE 40 26 104 C1 bekannten Verfahren hergestellten Katalysatoren lassen sich bereits recht günstige NOx- Umsatzgrade erzielen, wobei jedoch in Einzelfällen noch NH₃-Reste im Abgas auftreten können.The invention relates to a method for producing a catalyst for removing nitrogen oxides from exhaust gases with the addition of ammonia, the catalyst consisting of a carbon-containing material which is mixed with a mixed solution of 5 to 20%, in particular 5 to 15%, HCl and 1 to 8%, in particular 2 to 4% HNO₃ treated at a contact time of 5 to 60 min and dried after draining the mixed solution at 200 ° C or higher in an N₂ stream and the exhaust gas from the N₂ treatment condenses and in Cycle is returned. With the catalysts produced by this process known from DE 40 26 104 C1, very cheap NO x conversion rates can already be achieved, although in individual cases NH 3 residues can still occur in the exhaust gas.
Der Erfindung liegt, ausgehend von einem Verfahren der eingangs genannten Gattung, die Aufgabe zugrunde, dieses Herstellungsverfahren dahingehend weiterzuentwickeln, daß die Wirksamkeit des Katalysators aus kohlenstoffhaltigem Material hinsichtlich des erzielbaren NOx-Umsatzgrades weiter verbessert wird und NH₃-Reste im Abgas vermieden werden.The invention is, starting from a method of the initially mentioned type, the object of further developing this method of manufacture to the extent that the effectiveness of the catalyst of carbonaceous material of the recoverable NO x -Umsatzgrades is further improved and NH₃ residues are avoided in the exhaust gas.
Diese Aufgabe wird durch das im Kennzeichen des Anspruchs niedergelegte Merkmal gelöst.This task is accomplished by the in the hallmark of the claim resolved characteristic.
Durch Versuche hat sich überraschend herausgestellt, daß durch die erfindungsgemäße ergänzende Behandlung von kohlenstoffhaltigen Adsorptionsmitteln mit gasförmigem NH₃ in der Abkühlphase nach dem Trocknungsschritt noch wirksamere Katalysatoren zur Reduktion der Stickoxide erzeugt werden können.Experiments have surprisingly shown that by the additional treatment according to the invention of carbon-containing Adsorbents with gaseous NH₃ in the cooling phase after the drying step even more effective Catalysts for the reduction of nitrogen oxides are generated can.
Mit diesen Katalysatoren läßt sich der NOx-Umsatzgrad weiter steigern.The NO x conversion rate can be increased further with these catalysts.
Ein NH₃-Gehalt im Abgas wird praktisch vollständig vermieden, was sich äußerst günstig auf die Umweltsituation auswirkt.An NH₃ content in the exhaust gas is practically completely avoided, which is extremely beneficial to the environmental situation affects.
In den Tabellen 1 bis 3 sind Versuchsergebnisse aufgeführt, die die weiter verbesserte Wirksamkeit erfindungsgemäß hergestellter Katalysatoren bei der Reduktion von Stickoxiden mittels NH₃ aus den Abgasen von Kohlekraftwerken, von Müllheizkraftwerken und von Erdsanierungsanlagen ausweisen. In allen Versuchen wurden Katalysatoren verwendet, die aus handelsüblicher Aktivkohle durch Behandeln mit einer Mischlösung aus einer 10%igen HCl-Lösung und einer 4%igen HNO₃-Lösung hergestellt worden sind.Test results are listed in Tables 1 to 3, which the further improved effectiveness according to the invention Manufactured catalysts in the reduction of Nitrogen oxides using NH₃ from the exhaust gases from coal-fired power plants, of waste-to-energy plants and earth remediation plants identify. In all experiments, catalysts were used used that from commercially available activated carbon by treating with a mixed solution from a 10% HCl solution and a 4% HNO₃ solution have been.
Im einzelnen geht aus Tabelle 1 hervor, daß bei der NO- Entfernung aus Abgasen von Kohlekraftwerken durch Katalysatoren, die nach der Behandlung mit Mischlösung zusätzlich gasförmigem NH₃ ausgesetzt worden sind, gegenüber Katalysatoren, die nur mit der Mischlösung behandelt wurden, eine NO-Umsatzsteigerung von rd. 68 auf rd. 71 bzw. von rd. 71 auf rd. 77% bei einem gleichzeitigen Ammoniakschlupf von Null % erzielt worden ist.In detail, Table 1 shows that the NO- Removal from exhaust gases from coal-fired power plants by means of catalysts, after treatment with mixed solution gaseous NH₃ have been exposed to Catalysts treated only with the mixed solution a NO sales increase of approx. 68 to approx. 71 or of approx. 71 to approx. 77% with a simultaneous ammonia slip of zero% has been achieved.
Wie aus Tabelle 2 hervorgeht, in der die Entstickung von Abgasen von Müllheizkraftwerken durch Katalysatoren dargestellt ist, konnten bei einer Verwendung von mit Mischlösungen und zusätzlich mit NH₃-Gas behandelten Katalysatoren gegenüber von ausschließlich mit Mischlösung behandelten NO-Umsatzsteigerungen von rd. 77 auf rd. 88% erzielt werden, bei einem gleichzeitigen Rückgang des Ammoniakschlupfes auf Null %.As can be seen from Table 2, in which the denitrification of Exhaust gases from waste heat and power plants represented by catalysts is, when using mixed solutions and additionally treated with NH₃ gas catalysts compared to only treated with mixed solution NO sales increases of approx. 77 to approx. 88% achieved with a simultaneous decrease in ammonia slip to zero%.
Die Aktivierungszunahme erfolgte, obwohl bei Müllheizkraftwerken ein hoher Wasserdampfgehalt von 28% gegenüber 9,8% bei Kohlekraftwerken die Regel ist.The increase in activation took place, although in waste-to-energy plants compared to a high water vapor content of 28% 9.8% is the rule for coal-fired power plants.
Wie Tabelle 3 zeigt, in der die Entstickung der Abgase von Erdsanierungsanlagen dargestellt ist, konnten mit Katalysatoren, die mit Mischlösungen und zusätzlich mit NH₃-Gas behandelt worden sind, NO-Umsatzgrade von 75% gegenüber rd. 64% bei ausschließlich mit Mischlösungen behandelten Katalysatoren erreicht werden, ebenfalls bei gleichzeitigem Rückgang des Ammoniakschlupfes auf Null %. As Table 3 shows, in which the denitrification of the exhaust gases from earth remediation plants is shown, with catalysts that have been treated with mixed solutions and additionally with NH₃ gas, NO conversion rates of 75% compared to approx. 64% can be achieved with catalysts treated exclusively with mixed solutions, also with a simultaneous decrease in ammonia slip to zero%.
Claims (1)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19914125913 DE4125913C1 (en) | 1991-08-05 | 1991-08-05 | |
PCT/EP1992/001747 WO1993002775A1 (en) | 1991-08-05 | 1992-08-01 | Process for producing a catalyzer for removing nitrogen oxides from waste gas |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19914125913 DE4125913C1 (en) | 1991-08-05 | 1991-08-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE4125913C1 true DE4125913C1 (en) | 1993-01-07 |
Family
ID=6437734
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19914125913 Expired - Lifetime DE4125913C1 (en) | 1991-08-05 | 1991-08-05 |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE4125913C1 (en) |
WO (1) | WO1993002775A1 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4026104C1 (en) * | 1990-08-17 | 1992-02-13 | Bergwerksverband Gmbh, 4300 Essen, De | Nitrogen oxide(s) removal from waste gases - by using and carbon-contg. catalyst treated with e.g. hydrochloric acid |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3523326A1 (en) * | 1985-06-29 | 1987-01-08 | Steag Ag | METHOD FOR SEPARATING NO (DOWN ARROW) X (DOWN ARROW) FROM GASES, ESPECIALLY SMOKE GASES |
DE3620425C1 (en) * | 1986-06-18 | 1987-06-19 | Bergwerksverband Gmbh | Process for the production of an activated carbon catalyst |
DE3842526A1 (en) * | 1988-12-17 | 1990-06-21 | Bergwerksverband Gmbh | METHOD FOR PRODUCING A CATALYST FOR REMOVING NITROGEN OXIDS FROM EXHAUST GASES |
DE3915416A1 (en) * | 1989-05-11 | 1990-11-15 | Betr Forsch Inst Angew Forsch | Flue gas purificn. - using carbon catalyst with ammonium sulphate coating |
-
1991
- 1991-08-05 DE DE19914125913 patent/DE4125913C1/de not_active Expired - Lifetime
-
1992
- 1992-08-01 WO PCT/EP1992/001747 patent/WO1993002775A1/en active Application Filing
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4026104C1 (en) * | 1990-08-17 | 1992-02-13 | Bergwerksverband Gmbh, 4300 Essen, De | Nitrogen oxide(s) removal from waste gases - by using and carbon-contg. catalyst treated with e.g. hydrochloric acid |
Also Published As
Publication number | Publication date |
---|---|
WO1993002775A1 (en) | 1993-02-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8100 | Publication of the examined application without publication of unexamined application | ||
D1 | Grant (no unexamined application published) patent law 81 | ||
8364 | No opposition during term of opposition | ||
8330 | Complete disclaimer |