EP1113873A1 - Ceramic catalyst for selectively decomposing n 2?o and a method for the production thereof - Google Patents
Ceramic catalyst for selectively decomposing n 2?o and a method for the production thereofInfo
- Publication number
- EP1113873A1 EP1113873A1 EP99946074A EP99946074A EP1113873A1 EP 1113873 A1 EP1113873 A1 EP 1113873A1 EP 99946074 A EP99946074 A EP 99946074A EP 99946074 A EP99946074 A EP 99946074A EP 1113873 A1 EP1113873 A1 EP 1113873A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mass
- catalyst according
- catalyst
- active phase
- alkaline earth
- 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- Withdrawn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
- C01B21/24—Nitric oxide (NO)
- C01B21/26—Preparation by catalytic or non-catalytic oxidation of ammonia
- C01B21/265—Preparation by catalytic or non-catalytic oxidation of ammonia characterised by the catalyst
-
- 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
- B01J21/10—Magnesium; Oxides or hydroxides thereof
-
- 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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/02—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the alkali- or alkaline earth metals or beryllium
-
- 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)
Definitions
- the invention relates to a ceramic catalyst for the selective decomposition of N2O (nitrous oxide) in a mixture of nitrous gases to N 2 and O 2 and a process for its production.
- N2O nitrous oxide
- N 2 O (laughing gas) is released in a wide variety of processes, such as in fluidized bed combustion plants and in processes for the chemical synthesis of nylon, adipic and nitric acid. Due to its inertia, it reaches the stratosphere undecomposed, where it contributes to the long-term damage to the earth's protective ozone layer. Therefore, at the World Environment Conference in Kyoto in 1997, requirements for the global emission reduction of this gas were laid down for the first time. This requires the use of suitable catalysts to treat the exhaust gas flows.
- ceramic materials for example modified zeolites and mixed oxides with a perovskite structure, can be used as potential catalyst materials. Because of their price advantage over precious metals and their better temperature resistance, perovskite compounds are considered cheap.
- Catal. Lett. (1995), 34 (3, 4) pp. 373-382 is described by N.
- the previously known catalysts for the decomposition of N 2 O undergo an irreversible deactivation at temperatures above 700 ° C., which is caused by sintering processes (noble metal catalysts), by insufficient thermal stability of the framework structure (zeolites) or by irreversible reactions between the transition metal oxides of the active components with carrier materials, how such is caused with a high content of Al 2 O 3 .
- a special feature of the use in the production of nitric acid lies in the required selectivity in relation to other oxides of nitrogen, one of which is the target product of the synthesis. Such selectivity is not required or even undesirable in other exhaust treatment processes.
- the invention is therefore based on the object of providing a catalyst for the selective decomposition of N 2 O in a mixture of nitrous gases, which should be usable in the temperature range from 700 ° C. to at least 1000 ° C. without impairing its catalyst activity.
- alkaline earth compounds for example clays or aluminosilicates
- alkaline earth compounds in particular magnesium oxide
- the catalyst prevents the catalyst from being deactivated by a chemical reaction between the active phase and the carrier material at temperatures above 700 ° C., as is the case in the prior art, for example Spinel formation takes place between the oxides of aluminum and cobalt.
- various alkaline earth oxides themselves have a certain catalytic activity during nitrous oxide decomposition.
- the alkaline earth oxide is produced, for example, by calcining a salt, preferably the carbonate, the calcining temperature depending on the resistance of the carbonate of the element in question, on the desired grain size of the alkaline earth oxide and on the subsequent operating temperature of the catalyst.
- the oxides and mixed oxides of the catalytically active component are preferably produced wet-chemically by mixed precipitation, drying and thermal decomposition of the drying products.
- Alternative processes are the production by means of a solid-state reaction at high temperatures, pyrolytic processes and all other known processes for powder production.
- the active components can be added in the form of precursor compounds (salts), oxides or mixed oxides before or after the calcination of the carrier material.
- precursor compounds salts
- oxides oxides
- mixed oxides oxides
- the mixtures mentioned are plasticized and homogenized with the addition of suitable plasticizing aids and water, as is known in ceramic production.
- Strength-increasing binders such as, for example, silica sols, inorganic polymers, for example in the form of magnesium, aluminum or boron phosphates or binders, can be added, the proportion of which should be kept as low as possible, provided it is not an alkaline earth compound.
- These strength-increasing binders can be mixed in homogeneously before or after the calcination of the alkaline earth metal salt. Completion takes place according to the known ceramic processes, such as granulation or extrusion. Subsequent debinding and sintering can produce catalyst elements in the form of granules, bulk material or honeycomb bodies.
- Fig. 2 the selectivity of the catalyst of Fig. 1 over NO x also as a function of temperature.
- Fig. 4 the selectivity of the catalyst of Fig. 3 over NO x also as a function of temperature.
- Fig. 6 the selectivity of the catalyst of Fig. 5 over NO x also as a function of temperature.
- a catalyst according to the invention in granular form was made from 2000 vol. ⁇ Ppm N 2 O; using a test gas emulated from the process gas of nitric acid production; 9.0 vol% NO, 6.0 vol% O 2 ; 0.14 vol% H 2 O; Rest N 2 tested.
- the active phase consists of a heavy metal catalyst with the main components Mn, Fe, Cr and Co.
- the active phase is a lanthanum-strontium-manganese-cobalt-perovskite.
- the alkaline earth compounds for the carrier material are mixed with 15% by mass of an SiO 2 sol with an SiO 2 content of 13%. After the firing customary in ceramic technology, the SiO 2 content of the ceramic carrier material with good strength values is 1.95% by mass.
- the alkaline earth compounds for the carrier material are mixed with 14% by mass of a magnesium phosphate, which contains, inter alia, 6% MgO and 37% P 2 O 5 .
- a magnesium phosphate which contains, inter alia, 6% MgO and 37% P 2 O 5 .
- the MgO content of a ceramic carrier material essentially consists of CaO 0.84% by mass or, if the carrier material consists essentially of MgO, its proportion is increased by the same percentage.
- the alkaline earth compounds for the carrier material become one with 12 mass%
- Magnesium phosphates which contains 8% Al 2 O 3 and 35% P 2 O 5 , among others. After firing, the Al 2 O 3 content of the ceramic carrier material is 0.96
- the alkaline earth compounds for the carrier material are mixed with 8% by mass of a boron phosphate, which contains, inter alia, 36% B 2 O 3 and 57% P 2 O 5 . After firing, the B 2 O 3 content of the ceramic carrier material is 2.9% by mass.
- the alkaline earth compounds for the carrier material are 5.5% by mass
- Alumina precursor consisting of 85% Al 2 O 3 and 15% H 2 O, added. After firing, the Al 2 O 3 content of the ceramic carrier material is 4.7 mass%.
- the alkaline earth compounds for the carrier material are mixed with 5% by mass of a polymeric magnesium silicate, which contains, inter alia, 23.7% by mass of MgO and 57% by mass of SiO 2 .
- a polymeric magnesium silicate which contains, inter alia, 23.7% by mass of MgO and 57% by mass of SiO 2 .
- the MgO content of a ceramic carrier material consisting essentially of CaO is 1.2% by mass of MgO and 2.85% by mass of SiO 2, or if the carrier material consists essentially of MgO, the proportion thereof is around the mentioned Percentage increased.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1998141740 DE19841740A1 (en) | 1998-09-09 | 1998-09-09 | Ceramic catalyst for the selective decomposition of N2O and process for its production |
DE19841740 | 1998-09-09 | ||
PCT/EP1999/006392 WO2000013789A1 (en) | 1998-09-09 | 1999-08-31 | Ceramic catalyst for selectively decomposing n2o and a method for the production thereof |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1113873A1 true EP1113873A1 (en) | 2001-07-11 |
Family
ID=7880714
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99946074A Withdrawn EP1113873A1 (en) | 1998-09-09 | 1999-08-31 | Ceramic catalyst for selectively decomposing n 2?o and a method for the production thereof |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1113873A1 (en) |
AU (1) | AU5857199A (en) |
BR (1) | BR9912871A (en) |
DE (1) | DE19841740A1 (en) |
RU (1) | RU2221642C2 (en) |
WO (1) | WO2000013789A1 (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10006103A1 (en) * | 2000-02-11 | 2001-08-16 | Krupp Uhde Gmbh | Catalyst for decomposing N¶2¶O, its use in nitric acid production and process for its production |
DE10011738A1 (en) * | 2000-03-13 | 2002-03-28 | Porzellanwerk Kloster Veilsdor | Ceramic shaped catalyst bodies and method for producing such shaped catalyst bodies |
GB0315643D0 (en) * | 2003-04-29 | 2003-08-13 | Johnson Matthey Plc | Improved catalyst charge design |
RU2358901C2 (en) * | 2003-04-29 | 2009-06-20 | Джонсон Мэтти Плс | Development of improved catalyst download |
DE102007038711A1 (en) | 2007-08-14 | 2009-02-19 | Uhde Gmbh | Catalyst, process for its preparation and its use |
FR2922543B1 (en) * | 2007-10-18 | 2011-10-14 | Commissariat Energie Atomique | PROCESS FOR THE PREPARATION OF A CONTROLLED POROSITY-BASED GEOPOLYMER, THE GEOPOLYMER THUS OBTAINED AND ITS DIFFERENT APPLICATIONS |
DE502008001533D1 (en) | 2008-07-16 | 2010-11-25 | Umicore Ag & Co Kg | Catalyst for the conversion of nitrous oxide and its use in industrial nitric acid production |
GB0819094D0 (en) | 2008-10-20 | 2008-11-26 | Johnson Matthey Plc | Catalyst containment unit |
PL388518A1 (en) | 2009-07-10 | 2011-01-17 | Instytut Nawozów Sztucznych | Catalyst for high-temperature decomposition of nitrous oxide |
DE102010005105A1 (en) | 2010-01-19 | 2011-07-21 | Umicore AG & Co. KG, 63457 | catalyst |
PL237044B1 (en) | 2015-03-13 | 2021-03-08 | Inst Nowych Syntez Chemicznych | Carrier catalyst for the reduction of nitrogen oxide (I) emission, preferably from the nitric acid installation and method for producing it |
CN106390710A (en) * | 2016-06-14 | 2017-02-15 | 东莞市联洲知识产权运营管理有限公司 | High-efficiency medium-and-low-temperature desulphurization and denitration process for exhaust gas from flue of coke oven |
CN115501741B (en) * | 2022-08-30 | 2023-11-03 | 四川轻化工大学 | High-activity ferric oxide desulfurizing agent based on modified carrier, and preparation method and application thereof |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1451091A (en) * | 1973-10-04 | 1976-09-29 | Teijin Ltd | Preparation of 2,4,6-trimethylphenol |
JPS5390184A (en) * | 1977-01-21 | 1978-08-08 | Mitsubishi Heavy Ind Ltd | Production of exhaust gas treatment catalyst |
JPS5853571B2 (en) * | 1977-03-26 | 1983-11-30 | 宇部興産株式会社 | Method for manufacturing catalyst carrier for exhaust gas denitrification |
DE4000692A1 (en) * | 1990-01-12 | 1991-07-18 | Henkel Kgaa | USE OF COLLOIDAL SILICA AS ALUMINUM FOR CATALYSTS |
JPH0639282A (en) * | 1992-07-27 | 1994-02-15 | Hitachi Ltd | Decomposition catalyst for nitrogen oxide and decomposition method and purifying device using the same |
JPH07171346A (en) * | 1993-12-22 | 1995-07-11 | Yuichi Murakami | Removal of nitrous oxide |
US5705136A (en) * | 1995-11-13 | 1998-01-06 | University Of Florida Research Foundation, Inc. | Catalyzed decomposition of nitrogen oxides on metal oxide supports |
-
1998
- 1998-09-09 DE DE1998141740 patent/DE19841740A1/en not_active Withdrawn
-
1999
- 1999-08-31 EP EP99946074A patent/EP1113873A1/en not_active Withdrawn
- 1999-08-31 RU RU2001109258/04A patent/RU2221642C2/en not_active IP Right Cessation
- 1999-08-31 BR BR9912871-3A patent/BR9912871A/en not_active IP Right Cessation
- 1999-08-31 AU AU58571/99A patent/AU5857199A/en not_active Abandoned
- 1999-08-31 WO PCT/EP1999/006392 patent/WO2000013789A1/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO0013789A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2000013789A1 (en) | 2000-03-16 |
DE19841740A1 (en) | 2000-03-16 |
WO2000013789A8 (en) | 2000-07-27 |
BR9912871A (en) | 2001-10-16 |
AU5857199A (en) | 2000-03-27 |
RU2221642C2 (en) | 2004-01-20 |
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