NO300671B1 - Process for the preparation of gas-permeable grids for catalytic oxidation of ammonia - Google Patents
Process for the preparation of gas-permeable grids for catalytic oxidation of ammonia Download PDFInfo
- Publication number
- NO300671B1 NO300671B1 NO920986A NO920986A NO300671B1 NO 300671 B1 NO300671 B1 NO 300671B1 NO 920986 A NO920986 A NO 920986A NO 920986 A NO920986 A NO 920986A NO 300671 B1 NO300671 B1 NO 300671B1
- Authority
- NO
- Norway
- Prior art keywords
- palladium
- alloys
- rhodium
- wires
- ammonia
- Prior art date
Links
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 14
- 230000003197 catalytic effect Effects 0.000 title claims description 9
- 230000003647 oxidation Effects 0.000 title claims description 4
- 238000007254 oxidation reaction Methods 0.000 title claims description 4
- 238000009940 knitting Methods 0.000 claims abstract description 21
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 19
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 17
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 10
- 229910052703 rhodium Inorganic materials 0.000 claims abstract description 10
- 239000010948 rhodium Substances 0.000 claims abstract description 10
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 9
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 9
- 238000011084 recovery Methods 0.000 claims abstract description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052802 copper Inorganic materials 0.000 claims abstract description 6
- 239000010949 copper Substances 0.000 claims abstract description 6
- 229910052763 palladium Inorganic materials 0.000 claims abstract description 5
- -1 platinum metals Chemical class 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 4
- 229910001252 Pd alloy Inorganic materials 0.000 claims description 4
- 229910000629 Rh alloy Inorganic materials 0.000 claims description 4
- 229910001260 Pt alloy Inorganic materials 0.000 claims description 3
- 238000007084 catalytic combustion reaction Methods 0.000 claims description 3
- 229910000510 noble metal Inorganic materials 0.000 claims description 3
- PXXKQOPKNFECSZ-UHFFFAOYSA-N platinum rhodium Chemical compound [Rh].[Pt] PXXKQOPKNFECSZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 2
- 230000001747 exhibiting effect Effects 0.000 claims 1
- 239000003054 catalyst Substances 0.000 abstract description 8
- 238000002485 combustion reaction Methods 0.000 abstract description 7
- 239000010970 precious metal Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 3
- 229910000923 precious metal alloy Inorganic materials 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910001092 metal group alloy Inorganic materials 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000009941 weaving Methods 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
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
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/58—Fabrics or filaments
-
- 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
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/46—Ruthenium, rhodium, osmium or iridium
- B01J23/464—Rhodium
-
- 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
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/74—Iron group metals
- B01J23/755—Nickel
-
- 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
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/89—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with noble metals
- B01J23/892—Nickel and noble metals
-
- 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
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/89—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with noble metals
- B01J23/8926—Copper and noble metals
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
-
- 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
-
- 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
- C01B21/267—Means for preventing deterioration or loss of catalyst or for recovering lost catalyst
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B1/00—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
- D04B1/14—Other fabrics or articles characterised primarily by the use of particular thread materials
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2101/00—Inorganic fibres
- D10B2101/20—Metallic fibres
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2403/00—Details of fabric structure established in the fabric forming process
- D10B2403/02—Cross-sectional features
- D10B2403/024—Fabric incorporating additional compounds
- D10B2403/0242—Fabric incorporating additional compounds enhancing chemical properties
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Textile Engineering (AREA)
- Catalysts (AREA)
- Knitting Of Fabric (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Wire Processing (AREA)
Abstract
Description
Foreliggende oppfinnelse angår en fremgangsmåte for fremstilling av gassgjennomtrengelige nett for katalytisk oksydasjon av ammoniakk med luft eller for gjenvinning av de ved katalytisk ammoniakkforbrenning fordampende platinametaller ved strikking av tråder av platina- og palladiumlegeringer på stikkemaskiner. The present invention relates to a method for the production of gas-permeable nets for the catalytic oxidation of ammonia with air or for the recovery of the platinum metals that evaporate during the catalytic combustion of ammonia by knitting threads of platinum and palladium alloys on knitting machines.
Anvendelsen av edelmetallkatalysatorer i form av gasspermeable duker er en kjent metode for å gjennomføre spesielle katalytiske prosesser med optimale utbytter. Et kjent eksempel av anvendelsen av platina/rhodium-katalysatornett ved ammoniakkforbrenning for salpetersyrefremstilling. The use of noble metal catalysts in the form of gas-permeable cloths is a known method for carrying out special catalytic processes with optimal yields. A known example of the use of platinum/rhodium catalyst mesh in ammonia combustion for nitric acid production.
Nettformen for katalysatoren gir derved flere fordeler i forhold til vanlige katalysatorkonfigurasjoner. Med nettformen oppnår man f.eks. en stor overflate med god mekanisk fasthet. Via trådtrekking og trådveving kjenner man mekaniske festemetoder for forarbeiding av de katalytisk virksomme metaller og metallegeringer. Disse katalysatornett gjøres ferdige på vevestoler i baner og skjæres til i sirkelform tilsvarende dimensjonene i forbrenningsanleggene. Derved oppstår betydelige mengder avfall av edelmetall som må opparbeides. The net form of the catalyst thereby provides several advantages compared to conventional catalyst configurations. With the online form, you can e.g. a large surface with good mechanical strength. Via wire drawing and wire weaving, mechanical attachment methods are known for processing the catalytically active metals and metal alloys. These catalyst nets are finished on looms in webs and cut into circles corresponding to the dimensions of the combustion plants. This results in significant amounts of precious metal waste that must be processed.
Nett har imidlertid den fordel at de med sine masker danner en homogen struktur av metalltråder og frie gjennomløps-åpninger for reaksjonsgassene. Nets, however, have the advantage that with their meshes they form a homogeneous structure of metal wires and free passage openings for the reaction gases.
Inhomogeniteter i form av f. eks. sømmer eller sveisesteder som eventuelt kun hindrer en jevn gasstrøm, er ikke tilstede. Inhomogeneities in the form of e.g. there are no seams or welding points that may only prevent a steady gas flow.
Analogt tildannede nett anvendes også ved gjenvinning av edelmetaller, f.eks. ved ammoniakkforbrenningen. Ved hjelp av nett av palladiumlegeringer fanger man opp igjen mesteparten av de edelmetaller som fordamper under prosessen på platina/- rhodium-katalysatornettene. Analogously formed nets are also used in the recovery of precious metals, e.g. by the ammonia combustion. Using nets of palladium alloys, most of the precious metals that evaporate during the process are recaptured on the platinum/rhodium catalyst nets.
På grunn av fremstillingsmetoden har de vevede nett en rekke mangler. Dette gjelder den tid som går med for klargjøring av vevstolene, vevingen i store baner og utskjæringen av sirkelrunde nett fra firkantede baner med ca. 35 % tap. Due to the manufacturing method, the woven nets have a number of shortcomings. This applies to the time required for preparing the looms, the weaving in large webs and the cutting of circular webs from square webs with approx. 35% loss.
Det oppstår høye ferdigstillingsomkostninger på grunn av lange ferdigstillingstider og den store mengde tap, videre høye materialbindinger av dyrt edelmetall på vevestolen, noe som krever høy kapital. High completion costs arise due to long completion times and the large amount of losses, further high material bonds of expensive precious metal on the loom, which requires high capital.
De vevede nett kan erstattes av andre gasspermeable konfigurasjoner, således er det kjent f.eks. gjennomhullede metallfolier og metallfiberflor (DE-PS 1594716), metallfilt (DE-PS 2829035), eller sammenlagte slangeformede tråd-felttverk (DE-OS 2248811). The woven nets can be replaced by other gas-permeable configurations, thus it is known e.g. perforated metal foils and metal fiber mats (DE-PS 1594716), metal felt (DE-PS 2829035), or combined snake-shaped wire-felt networks (DE-OS 2248811).
Disse konfigurasjoner har imidlertid ikke fått anvendelse i praksis da de fremfor alt påvirker strømningsforholdene i reaksjonsrommet på negativ måte. However, these configurations have not been used in practice as they primarily affect the flow conditions in the reaction space in a negative way.
I EP-PS 0077121 nevnes i den senere tid også strikkede nett for edelmetallgjenvinning ved ammoniakkfremstilling. Om form og fremstilling sies dog intet. In recent times, EP-PS 0077121 also mentions knitted nets for precious metal recovery in ammonia production. However, nothing is said about form and production.
Fra EP-OS 0364153 er det kjent en fremgangsmåte for fremstilling av nett av edelmetallegeringer, spesielt for katalytisk ammoniakkforbrenning og edelmetallgjenvinning, der tråder av edelmetallegering strikkes sammen med en hjelpetråd av naturlige fibre eller et kunststoff på en strikkemaskin. En strikking av tråder av rene edelmetallegeringer uten hjelpetråder er ikke mulig, da trådene brekker og brister ved strikkingen hvorved strekkfastheten, tråddiameteren, duktiliteten og overflatefriksjonsfaktoren for materialene spiller en vesentlig rolle. Medanvendelse av en hjelpetråd har den mangel at denne må fjernes igjen før nettet brukes, noe som kan skje ved brenning eller oppløsning. Begge metoder er kompliserte og kan føre til forurensninger av metalleger-ingene, noe som i sin tur kan føre til negativ innvirkning på den katalytiske aktivitet og tilbakevirkningsgraden. From EP-OS 0364153, a method is known for producing nets of precious metal alloys, especially for catalytic ammonia combustion and precious metal recycling, where threads of precious metal alloy are knitted together with an auxiliary thread of natural fibers or a synthetic material on a knitting machine. A knitting of threads of pure precious metal alloys without auxiliary threads is not possible, as the threads break and burst during knitting, whereby the tensile strength, thread diameter, ductility and surface friction factor of the materials play a significant role. The combined use of an auxiliary thread has the disadvantage that this must be removed again before the net is used, which can happen by burning or dissolving. Both methods are complicated and can lead to contamination of the metal alloys, which in turn can lead to a negative impact on the catalytic activity and the degree of reactivity.
Oppgave for foreliggende oppfinnelse er derfor å tilveie-bringe en fremgangsmåte for fremstilling av gasspermeable nett av edelmetall for katalytiske prosesser, spesielt for katalytisk oksydasjon av ammoniakk eller gjenvinning av de ved den katalytiske ammoniakkforbrenning fordampende platinametaller ved strikking av tråder av platina- eller palladiumlegeringer på strikkemaskiner, ved hvilken det ikke er nødvendig med medanvendelse av hjelpetråder og der man allikevel oppnår den for den angjeldende prosess nødvendige flatevekt på mer enn 300 g/m2 . The task of the present invention is therefore to provide a method for the production of gas-permeable nets of noble metal for catalytic processes, in particular for catalytic oxidation of ammonia or recovery of the platinum metals that evaporate during the catalytic combustion of ammonia when knitting threads of platinum or palladium alloys on knitting machines , in which it is not necessary to use auxiliary threads and where the required basis weight of more than 300 g/m2 is still achieved for the process in question.
Denne oppgave løses ifølge oppfinnelsen ved at man anvender tråder av platina-rhodiumlegeringer med 4 til 12 vekt-# rhodium eller tråder av platina-palladium-rhodiumlegeringer med 4 til 12 vekt-# palladium og rhodium, eller tråder av palladium-nikkellegeringer med 2 til 15 vekt-# nikkel, eller tråder av palladium-kobberlegeringer med 2 til 15 vekt-# kobber, eller tråder av palladium-nikkel-kobberlegeringer med 2 til 15 vekt-# nikkel og kobber, som har en diameter på 50 til 120 pm, en strekkstyrke på 900 til 1050 N/mm<2> og en utvidelsesgrense på 0,5 til 3 %, og at det anvendes flatestrikkemaskiner hvis deling ligger mellom 3,63 mm og 1,81 mm og maskevidde ligger mellom 2 og 6 mm. Med deling menes, i henhold til DIN 60917, avstanden mellom midten av to ved siden av hverandre stående nåler på den samme nålebærer. Delingen på 3,63 mm til 1,81 mm tilsvarer et nålantall pr. tomme (25,4 mm) på mellom 7 og 14. This task is solved according to the invention by using threads of platinum-rhodium alloys with 4 to 12 wt-# of rhodium or threads of platinum-palladium-rhodium alloys with 4 to 12 wt-# of palladium and rhodium, or threads of palladium-nickel alloys with 2 to 15 wt-# nickel, or wires of palladium-copper alloys with 2 to 15 wt-# copper, or wires of palladium-nickel-copper alloys with 2 to 15 wt-# nickel and copper, having a diameter of 50 to 120 pm, a tensile strength of 900 to 1050 N/mm<2> and an expansion limit of 0.5 to 3%, and that flat knitting machines are used whose pitch is between 3.63 mm and 1.81 mm and mesh size is between 2 and 6 mm. According to DIN 60917, pitch means the distance between the centers of two adjacent needles on the same needle carrier. The division of 3.63 mm to 1.81 mm corresponds to a number of needles per inch (25.4 mm) of between 7 and 14.
I mange tilfeller er det fordelaktig å strikke to eller flere tråder sammen. In many cases it is advantageous to knit two or more threads together.
Ved å overholde disse tråd- og strikkemaskinparametre kan man fra platina-rhodiumtråder med f.eks. 10 vekt-# rhodium eller palladium-nikkeltråder med f.eks. 5 vekt-# nikkel, meget overraskende og uten anvendelse av hjelpetråder, strikke nett med absolutt feilfritt tildannede masker, som ved anvendelse i gasstrømmen ikke gir inhomogeniteter. By complying with these thread and knitting machine parameters, one can from platinum-rhodium threads with e.g. 10 wt # rhodium or palladium-nickel wires with e.g. 5 weight-# nickel, very surprisingly and without the use of auxiliary threads, knit nets with absolutely flawless formed stitches, which when used in the gas flow do not produce inhomogeneities.
Trådbrudd er ikke registrerbart, henholdsvis opptrer ikke under strikkingen, og man kan uten videre oppnå flatevekter på mer enn 300 g/m2 . Thread breakage is not detectable, or does not occur during knitting, and you can easily achieve surface weights of more than 300 g/m2.
Anvendelsen av flatestrikkemaskiner bringer den ytterligere fordel at strikkeveven kan tildannes rundt til sluttmål og derved nøyaktig til den for anlegget krevde diameter, slik at det ikke oppstår noe avfall ved den ellers nødvendige tilskjæring av strikkevirket, et avfall som i sin tur måtte opparbeides igjen. The use of flat knitting machines brings the further advantage that the knitted fabric can be formed round to the final size and thereby exactly to the diameter required for the plant, so that no waste is produced by the otherwise necessary trimming of the knitting fabric, a waste which in turn had to be processed again.
Det følgende eksempel skal forklare fremgangsmåten nærmere: 1. For fremstilling av et rundt katalysatornett for ammoniakkforbrenning med diameter 2300 mm benyttes en flatestrikkemaskin med deling på 2,17 mm (12 nåler pr. tomme (25,4 mm)). Virket strikkes med en tråd av 90 platina/10 rhodium med diameter 76 um, hvorved tråden anvendes dobbel. Den har en strekkstyrke på 930 N/mm<2> og en utvidelsesgrense på 1 %. The following example will explain the procedure in more detail: 1. A flat knitting machine with a pitch of 2.17 mm (12 needles per inch (25.4 mm)) is used to produce a round catalyst mesh for ammonia combustion with a diameter of 2300 mm. The work is knitted with a thread of 90 platinum/10 rhodium with a diameter of 76 µm, whereby the thread is used double. It has a tensile strength of 930 N/mm<2> and an expansion limit of 1%.
Maskelengden ved strikkingen er 2,8 mm. Man oppnår et nett med en flatevekt på ca. 600 g/m2 , og som med meget gode resultater kan anvendes ved ammoniakkforbrenningsanlegg. 2. For fremstilling av runde gjenvinningsnett for ammoniakkforbrenning benyttes en to-sjikts flatestrikkemaskin med en deling på 2,54 mm. The stitch length when knitting is 2.8 mm. This results in a net with a basis weight of approx. 600 g/m2, and which can be used with very good results in ammonia incineration plants. 2. A two-layer flat knitting machine with a pitch of 2.54 mm is used for the production of round recycling nets for ammonia combustion.
Tråden med en sammensetning på 95 palladium/ 5 nikkel har en diameter på 90 um, en strekkstyrke på 920 N/mm<2> og en utvidelsesgrense på 1 %. Maskelengden ved strikkingen er 3,9 mm. Man oppnår et nett med diameter 3700 mm med en flatevekt på 500 g/m<2> når man benytter tråden dobbelt. Gjenvinningsgraden av platinametaller 1 ammoniakkfor-brenningsanlegget er minst like høy som ved de tilsvarende vevede nett. The wire with a composition of 95 palladium/ 5 nickel has a diameter of 90 µm, a tensile strength of 920 N/mm<2> and an expansion limit of 1%. The stitch length when knitting is 3.9 mm. A net with a diameter of 3700 mm with a basis weight of 500 g/m<2> is obtained when the wire is used twice. The recovery rate of platinum metals in the ammonia incinerator is at least as high as for the corresponding woven nets.
Claims (1)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4108625 | 1991-03-16 | ||
| DE4206199A DE4206199C1 (en) | 1991-03-16 | 1992-02-28 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| NO920986D0 NO920986D0 (en) | 1992-03-13 |
| NO920986L NO920986L (en) | 1992-09-17 |
| NO300671B1 true NO300671B1 (en) | 1997-07-07 |
Family
ID=25901946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO920986A NO300671B1 (en) | 1991-03-16 | 1992-03-13 | Process for the preparation of gas-permeable grids for catalytic oxidation of ammonia |
Country Status (22)
| Country | Link |
|---|---|
| EP (1) | EP0504723B1 (en) |
| JP (1) | JPH0564746A (en) |
| KR (1) | KR920017714A (en) |
| CN (1) | CN1035042C (en) |
| AT (1) | ATE93410T1 (en) |
| AU (1) | AU644725B2 (en) |
| BG (1) | BG60171B1 (en) |
| BR (1) | BR9200886A (en) |
| CA (1) | CA2063041A1 (en) |
| CS (1) | CS75792A3 (en) |
| DE (2) | DE4206199C1 (en) |
| DK (1) | DK0504723T3 (en) |
| ES (1) | ES2046903T3 (en) |
| FI (1) | FI921093A (en) |
| HU (1) | HU211812B (en) |
| IL (1) | IL101187A0 (en) |
| MX (1) | MX9201108A (en) |
| NO (1) | NO300671B1 (en) |
| PL (1) | PL166988B1 (en) |
| RU (1) | RU2017520C1 (en) |
| TR (1) | TR26402A (en) |
| YU (1) | YU24892A (en) |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2274071A (en) * | 1993-01-06 | 1994-07-13 | Pgp Ind Inc | Catalyst pack |
| DE4300791A1 (en) * | 1993-01-14 | 1994-07-21 | Heraeus Gmbh W C | Knitted wire made of precious metal and process for its manufacture |
| US6073467A (en) * | 1994-04-06 | 2000-06-13 | Degussa Aktiengesellschaft | Catalyst gauzes for gaseous reactions |
| DE4411774C1 (en) * | 1994-04-06 | 1995-08-17 | Degussa | Metal gauze catalyst for gas reaction, esp. ammonia oxidn. to nitric acid |
| JP2002100180A (en) | 2000-09-22 | 2002-04-05 | Toshiba Corp | Magnetic disk unit |
| WO2002062466A2 (en) * | 2001-02-08 | 2002-08-15 | Omg Ag & Co. Kg | Three-dimensional catalyst gauzes knitted in two or more layers |
| CN100457935C (en) * | 2005-11-09 | 2009-02-04 | 贵研铂业股份有限公司 | Palladium-base alloy for recovering platinum catalyst and recovering net |
| CN100362134C (en) * | 2005-11-17 | 2008-01-16 | 常州市裕和金属材料有限公司 | New process for separating metal fiber copper protective layer by catalytic ammonia leaching method |
| DE102011016044A1 (en) | 2011-04-04 | 2012-10-04 | Jens Kopatsch | Preparing woven, knitted and/or crocheted metal-, precious metal- or alloy grids, comprises deforming or molding wire with non-circular peripheral shape via pulling, rolling, pressing or shape-changing radiation to produce shaped wire |
| CN103623815A (en) * | 2013-07-24 | 2014-03-12 | 上海派特贵金属有限公司 | Novel platinum-rhodium alloy knitted catalytic set gauze and preparation method thereof |
| EP3056267A1 (en) | 2015-02-12 | 2016-08-17 | Umicore AG & Co. KG | Catalyst gauze and installation for the catalytic oxidation of ammunia |
| EP3779005A1 (en) | 2019-08-16 | 2021-02-17 | Umicore Ag & Co. Kg | Knitting of precious metal nets with common material at the periphery, net from precious metal obtained thereby and a process using the precious metal net |
| EP3795728A1 (en) | 2019-09-17 | 2021-03-24 | Umicore Ag & Co. Kg | Knitting of precious metal networks and a method using same |
| EP3812154B1 (en) * | 2019-10-21 | 2023-05-17 | Heraeus Deutschland GmbH & Co. KG | Method for making a catalyst system for gas reactions |
| EP3900826A1 (en) | 2020-04-22 | 2021-10-27 | UMICORE AG & Co. KG | Pure metal network for catalysing gas phase reactions |
| DE102020120927B4 (en) | 2020-08-07 | 2024-01-25 | Jens Kopatsch | Process for producing networks with a tertiary structure for the catalytic conversion of fluids |
| EP4001483A1 (en) | 2020-11-17 | 2022-05-25 | UMICORE AG & Co. KG | Precious metal net for catalysing gas phase reactions, method of making same and its use in an ammonia oxiditation process |
| WO2022106395A1 (en) | 2020-11-17 | 2022-05-27 | Umicore Ag & Co. Kg | Precious metal mesh for catalyzing gas-phase reactions |
| EP4310209A1 (en) * | 2022-07-19 | 2024-01-24 | Yara International ASA | Method for recovering volatile pt or pd and system thereof |
| DE202024101437U1 (en) | 2024-03-22 | 2024-03-28 | Umicore Ag & Co. Kg | Knitted net packing for ammonia decomposition |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR771524A (en) * | 1933-07-06 | 1934-10-10 | Comptoir General Des Metaux Pr | Improvement in platinum fabrics used as catalysts |
| US3881877A (en) * | 1971-10-05 | 1975-05-06 | Matthey Bishop Inc | Catalyst supporting screen |
| DE2829035A1 (en) * | 1978-07-01 | 1980-01-10 | Heraeus Gmbh W C | Silver or platinum metal catalyst in form of fibre felt - used for ammonia oxidn. and mfr. of hydrogen cyanide and formaldehyde |
| DE2855102A1 (en) * | 1978-12-20 | 1980-07-17 | Inst Nawozow Sztucznych W Pula | Catalyst contg. platinum and palladium based layers - used in oxidn. of ammonia to form nitric oxide |
| GB2062486B (en) * | 1979-11-08 | 1984-09-19 | Johnson Matthey Co Ltd | Catalytic gauze packs |
| AU550041B2 (en) * | 1981-08-12 | 1986-02-27 | Engelhard Corporation | Recovering platinum and rhodium in nitric acid plant |
| DE3781629T2 (en) * | 1986-08-06 | 1993-02-18 | Engelhard Corp | PLATINUM-COATED PLATINUM AND RHODIUM CATALYST FIBERS, THEIR PRODUCTION AND USE FOR THE OXYDATION OF AMMONIA. |
| ATE73010T1 (en) * | 1988-10-12 | 1992-03-15 | Johnson Matthey Plc | METAL FABRIC. |
-
1992
- 1992-02-28 DE DE4206199A patent/DE4206199C1/de not_active Expired - Lifetime
- 1992-03-10 IL IL101187A patent/IL101187A0/en unknown
- 1992-03-11 EP EP92104159A patent/EP0504723B1/en not_active Expired - Lifetime
- 1992-03-11 DE DE92104159T patent/DE59200009D1/en not_active Expired - Lifetime
- 1992-03-11 DK DK92104159.6T patent/DK0504723T3/en active
- 1992-03-11 ES ES199292104159T patent/ES2046903T3/en not_active Expired - Lifetime
- 1992-03-11 AT AT92104159T patent/ATE93410T1/en not_active IP Right Cessation
- 1992-03-12 TR TR92/0241A patent/TR26402A/en unknown
- 1992-03-12 YU YU24892A patent/YU24892A/en unknown
- 1992-03-13 BG BG096061A patent/BG60171B1/en unknown
- 1992-03-13 JP JP4054705A patent/JPH0564746A/en active Pending
- 1992-03-13 PL PL92293835A patent/PL166988B1/en unknown
- 1992-03-13 NO NO920986A patent/NO300671B1/en not_active IP Right Cessation
- 1992-03-13 AU AU12917/92A patent/AU644725B2/en not_active Expired - Fee Related
- 1992-03-13 CS CS92757A patent/CS75792A3/en unknown
- 1992-03-13 RU SU925011029A patent/RU2017520C1/en active
- 1992-03-13 MX MX9201108A patent/MX9201108A/en not_active IP Right Cessation
- 1992-03-13 FI FI921093A patent/FI921093A/en not_active Application Discontinuation
- 1992-03-13 BR BR929200886A patent/BR9200886A/en not_active IP Right Cessation
- 1992-03-13 CA CA002063041A patent/CA2063041A1/en not_active Abandoned
- 1992-03-14 CN CN92101748A patent/CN1035042C/en not_active Expired - Lifetime
- 1992-03-14 KR KR1019920004187A patent/KR920017714A/en not_active Application Discontinuation
- 1992-03-16 HU HU9200872A patent/HU211812B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| BG60171B1 (en) | 1993-12-27 |
| FI921093A0 (en) | 1992-03-13 |
| PL293835A1 (en) | 1993-03-08 |
| RU2017520C1 (en) | 1994-08-15 |
| PL166988B1 (en) | 1995-07-31 |
| AU1291792A (en) | 1992-09-17 |
| ES2046903T3 (en) | 1994-02-01 |
| BR9200886A (en) | 1992-11-17 |
| DE59200009D1 (en) | 1993-09-30 |
| EP0504723A1 (en) | 1992-09-23 |
| CN1035042C (en) | 1997-06-04 |
| CA2063041A1 (en) | 1992-09-17 |
| HU211812B (en) | 1995-12-28 |
| ATE93410T1 (en) | 1993-09-15 |
| BG60171B2 (en) | 1993-11-30 |
| EP0504723B1 (en) | 1993-08-25 |
| HU9200872D0 (en) | 1992-05-28 |
| IL101187A0 (en) | 1992-11-15 |
| CS75792A3 (en) | 1992-10-14 |
| KR920017714A (en) | 1992-10-21 |
| MX9201108A (en) | 1992-12-21 |
| TR26402A (en) | 1995-03-15 |
| DK0504723T3 (en) | 1993-11-29 |
| DE4206199C1 (en) | 1992-11-12 |
| FI921093A (en) | 1992-09-17 |
| AU644725B2 (en) | 1993-12-16 |
| CN1065027A (en) | 1992-10-07 |
| JPH0564746A (en) | 1993-03-19 |
| NO920986L (en) | 1992-09-17 |
| HUT63589A (en) | 1993-09-28 |
| YU24892A (en) | 1994-06-10 |
| NO920986D0 (en) | 1992-03-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| NO300671B1 (en) | Process for the preparation of gas-permeable grids for catalytic oxidation of ammonia | |
| AU612906B2 (en) | Metal fabrics | |
| US6089051A (en) | Warp-knit fabric of noble metal-containing wires, and method for the production thereof | |
| CA2141331C (en) | Wires incorporating a helical component, assemblies thereof, and use of said assemblies as catalyser and/or to recover precious metals | |
| RU2298433C2 (en) | Three-dimensional catalytic nets braided in two or more layers | |
| US11959208B2 (en) | Knitting of precious metal networks and a method using same | |
| CN113286655A (en) | Catalyst system and method for catalytic combustion of ammonia to form nitrogen oxides in medium-pressure systems | |
| US20020127932A1 (en) | Three-dimensional catalyst gauzes knitted in two or more layers | |
| EP0544710A1 (en) | Improvements in or relating to catalysts and getter systems | |
| US5268157A (en) | Process for the production of catalytic gas permeable nets and process for oxidizing ammonia | |
| US6073467A (en) | Catalyst gauzes for gaseous reactions | |
| RU2095135C1 (en) | Three-dimensional network for catalytic reactions | |
| US20220143591A1 (en) | Catalyst gauze | |
| RU2776371C1 (en) | Catalyst grid | |
| RU2150389C1 (en) | Packet of gas-permeable noble-metal grids for catalytic processes | |
| TW202415447A (en) | Catalyst system having a catalyst network comprising a noble metal wire for long campaigns in ammonia oxidation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PDP | Decision of opposition (par. 25 patent act) |
Free format text: PATENTET OPPRETTHOLDES I UENDRET FORM Effective date: 20010712 |
|
| MK1K | Patent expired |