DE3718370A1 - Process and apparatus for the thermal treatment of catalysts - Google Patents
Process and apparatus for the thermal treatment of catalystsInfo
- Publication number
- DE3718370A1 DE3718370A1 DE19873718370 DE3718370A DE3718370A1 DE 3718370 A1 DE3718370 A1 DE 3718370A1 DE 19873718370 DE19873718370 DE 19873718370 DE 3718370 A DE3718370 A DE 3718370A DE 3718370 A1 DE3718370 A1 DE 3718370A1
- Authority
- DE
- Germany
- Prior art keywords
- zeolite
- exhaust gas
- nickel nitrate
- engobe
- flour
- 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.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/20—Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
- C01B21/50—Nitrous acid; Salts thereof
-
- 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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- 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
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/08—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the faujasite type, e.g. type X or Y
- B01J29/10—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the faujasite type, e.g. type X or Y containing iron group metals, noble metals or copper
- B01J29/14—Iron group metals or copper
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/18—Nitrates of ammonium
- C01C1/185—Preparation
Abstract
Description
Wabenkörperkatalysatoren, Mehlformkatalysatoren, vorzugs weise mit Faujasit-Zeolith zur Konvertierung und vorzugs weise Zersetzung der Dioxinanteile in Verbrennungsabgasen und Sonderverbrennungsabgasen, werden vorzugsweise mit Nickelnitratlösungen belegt und thermisch behandelt, wobei das Nickelnitrat zu Nickeloxid umgesetzt wird.Honeycomb catalysts, flour form catalysts, preferred wise with faujasite zeolite for conversion and preferred wise decomposition of the dioxin components in combustion gases and special combustion gases, are preferably with Nickel nitrate solutions coated and thermally treated, whereby the nickel nitrate is converted to nickel oxide.
Zeolith in der Natriumform, vorzugsweise Faujasit, Dotierung vorzugsweise mit Nickelnitrat zur Verbesserung der Aktivi tät, wird vorzugsweise eingesetzt zum Beseitigen der Dio xine in Abgasen.Zeolite in the sodium form, preferably faujasite, doping preferably with nickel nitrate to improve activity act, is preferably used to eliminate the Dio xine in exhaust gases.
Vorzugsweise wird der Zeolith in Mehlform (Pulver) in wäßri ger Lösung (Nickelnitratlösung) gelöst und danach getrocknet. Vorzugsweise im Sprühtrocknungsverfahren wird so ein nickel nitratdotiertes Zeolithmehl hergestellt.Preferably, the zeolite in flour form (powder) in aq ger solution (nickel nitrate solution) and then dried. A nickel is preferably used in the spray drying process nitrate-doped zeolite flour.
Im geschlossenen System wird nach der Kalzinierung NO x vom Nickelnitrat freigesetzt, zurück bleibt Nickeloxid als Dotierung des Zeolithmaterials. Vorzugsweise wird der katalytisch wirksame Zeolith bevor er als Engobe auf einen Wabenkörper, wie bei dem Entsticken nach Feuerungen angewandt, in vorzugsweise einem Schlicker gelöst und als Fritte oder Engobe, vorzugsweise nach einer Trockenphase bei +600°C, kalziniert oder gebrannt.In the closed system, NO x is released from the nickel nitrate after the calcination, leaving nickel oxide as the doping of the zeolite material. The catalytically active zeolite is preferably dissolved in a slip before being used as an engobe on a honeycomb body, as in the case of denaturing after firing, and calcined or fired as a frit or engobe, preferably after a drying phase at + 600 ° C.
Die Abgase aus der Zeolith-Nickeloxidgemischherstellung werden vorzugsweise dekontaminiert durch eine Abgaswäsche oder es wird bei der vorzugsweise Nickelnitrattrocknung freiwerdendes NO2, vorzugsweise Ammoniumnitrit NH4NO2, erzeugt, in einer ammoniakalischen Wäsche oder in einer vorzugsweise trockenen Harnstoffhydrolyse zurückgehalten. The exhaust gases from the zeolite-nickel oxide mixture production are preferably decontaminated by scrubbing the exhaust gas or NO 2 , preferably ammonium nitrite NH 4 NO 2 , which is released during the preferably nickel nitrate drying, is retained in an ammoniacal wash or in a preferably dry urea hydrolysis.
Die bei der Abgasdekontaminierung aus der Katalysatorher tellung entstandenen Restprodukte, nach der vorzugswei se Faujasit-Na-Zeolithdotierung mit Nickelnitrat, Trocknung und Kalzinierung, sind ein Wirtschaftsgut.The exhaust gas decontamination from the catalyst resulting residual products, according to the preferred se faujasite-Na zeolite doping with nickel nitrate, drying and calcination, are an economic asset.
Versuche haben gezeigt, daß die Verweilzeit von Schad stoffreduktionsmitteln bis zur Reaktion mit vorzugsweise Abgasbestandteilen in einem vorzugsweise Venturirohr vom Gasstrom schwebend gehalten werden können, auch wenn die Zugabe des vorzugsweise Harnstoffes überstöchiomet risch erfolgte, wird bei Aufrechterhaltung des Gasstrom flusses eine komplette Reaktion mit den zu bindenden Schadstoffen dieser Verweilraum oder Reaktionsventuri auch erfindungsgemäß als Entstaubungs-, Entschwefelungs- und Entstickungskomponente eingesetzt werden.Experiments have shown that the dwell time of Schad substance reducing agents until reaction with preferably Exhaust gas components in a preferably Venturi tube from Gas flow can be kept floating, even if the addition of the preferably urea is stoichiometric risch was carried out while maintaining the gas flow a complete reaction with those to be bound Pollutants this dwell or reaction venturi also according to the invention as a dedusting, desulfurizing and denitrification components are used.
Claims (7)
auf +200°C erhitzen, 1 Stunde halten, Temperatur erhöhen auf +400°C, 2 Stunden halten, Temperatur auf +600°C er höhen, 2 Stunden halten, direkt im Sammler des Mehl- oder Zeolithpulverabscheiders.2. According to claim 1, characterized in that the spray dryer generated, preferably zeolite-nickel nitrate flour is filtered off in the collector, preferably the zeolite-nickel nitrate is thermally treated, preferably in the manner:
Heat to + 200 ° C, hold for 1 hour, raise temperature to + 400 ° C, hold for 2 hours, raise temperature to + 600 ° C, hold for 2 hours, directly in the collector of the flour or zeolite powder separator.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19873718370 DE3718370A1 (en) | 1987-06-02 | 1987-06-02 | Process and apparatus for the thermal treatment of catalysts |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19873718370 DE3718370A1 (en) | 1987-06-02 | 1987-06-02 | Process and apparatus for the thermal treatment of catalysts |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3718370A1 true DE3718370A1 (en) | 1988-12-15 |
Family
ID=6328835
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19873718370 Withdrawn DE3718370A1 (en) | 1987-06-02 | 1987-06-02 | Process and apparatus for the thermal treatment of catalysts |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3718370A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4113597A1 (en) * | 1990-04-28 | 1991-10-31 | Babcock Anlagen Ag | Purification of waste gas contg. prods. of incomplete combustion - by adsorption on zeolite |
US6503469B2 (en) * | 1998-06-22 | 2003-01-07 | Mitsubishi Heavy Industries, Ltd. | Method for processing polluted fluid containing pollutants |
-
1987
- 1987-06-02 DE DE19873718370 patent/DE3718370A1/en not_active Withdrawn
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4113597A1 (en) * | 1990-04-28 | 1991-10-31 | Babcock Anlagen Ag | Purification of waste gas contg. prods. of incomplete combustion - by adsorption on zeolite |
US6503469B2 (en) * | 1998-06-22 | 2003-01-07 | Mitsubishi Heavy Industries, Ltd. | Method for processing polluted fluid containing pollutants |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8139 | Disposal/non-payment of the annual fee | ||
8170 | Reinstatement of the former position | ||
8139 | Disposal/non-payment of the annual fee |