US3914114A - Catalytic supports - Google Patents

Catalytic supports Download PDF

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Publication number
US3914114A
US3914114A US366082A US36608273A US3914114A US 3914114 A US3914114 A US 3914114A US 366082 A US366082 A US 366082A US 36608273 A US36608273 A US 36608273A US 3914114 A US3914114 A US 3914114A
Authority
US
United States
Prior art keywords
support
metal filaments
metallic
catalytic
perimeter
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
Application number
US366082A
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English (en)
Inventor
Andre Charmes
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Calinter SA
Original Assignee
Calinter SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Calinter SA filed Critical Calinter SA
Application granted granted Critical
Publication of US3914114A publication Critical patent/US3914114A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/12—Radiant burners
    • F23D14/18—Radiant burners using catalysis for flameless combustion
    • 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
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12444—Embodying fibers interengaged or between layers [e.g., paper, etc.]
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12472—Microscopic interfacial wave or roughness
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
    • Y10T428/12611—Oxide-containing component

Definitions

  • Customary catalytic supports such as those made from silica-alumina wool, by means of balls or clusters of alumina balls etc. have numerous drawbacks.
  • Supports based on fibers have no mechanical resistance when they are heated to temperatures of the order of 700 so that they are not able to resist vibrations, in particular, at the time of the displacement of the burners on which they are installed. At the time of their impregnation, a great part of the catalyst is lost due to the fact that it does not adhere to this type of support, which causes a considerable loss of money.
  • the support according to the invention is namely remarkable in that it is constituted by metal members of which the ratio of the perimeter of their cross-section to the surface of this section is comprised between 30 and 500.
  • the metal members are integral with a permeable surface and arranged perpendicularly to the latter.
  • FIG. 1 shows a portion of the member intended for producing a catalytic support according to the invention, to a considerably enlarged scale.
  • FIG. 2 is a sectional view thereof on line 22 (FIG. I).
  • FIG. 3 is a diagrammatic partial sectional view of one embodiment of a support according to the invention.
  • FIGS. 1 and 2 show a member I intended for producing a catalytic support according to the invention.
  • This member 1 is, for example, in the form of a shaving coming from the machining of a part by means of a cutting tool.
  • the member 1 may be obtained by traversing a cylindrical work-piece on a lathe. The forwards movement of the tool is determined such that the ratio of the perimeter of the straight section of the shaving to the surface of said section is greater than 30 and less than 500.
  • the periphery of the member 1 comprises a multiplicity of uneven part or burrs which considerably increase the perimeter of a cross-section without increasing its surface.
  • the aforesaid ratio may thus readily be comprised within the range given.
  • a large number of members 1 are placed side by side in order to from a slab for example.
  • the latter is then heated to a tem' perature of about 800C in order that its members oxidize superficially; the oxide produced is perfectly adherent owing to the presence of the burrs 2.
  • the slab is then allowed to cool and is then immersed in a solution containing the active substances of the catalyst which penetrate the porous layer of the oxide.
  • This layer is proportional to the outer surface of each member, whereas the thermal conductivity of the latter is proportional to the surface of its cross-section.
  • the members 1 may be made in the form of extruded threads 3 whose periphery also comprises numerous microscopic burrs and which is inserted between two fabrics of any type in the manner of shaggy yarn for producing a velvet material.
  • the sheet of extruded yarn is then cut between the two fabrics in order to form a type of velvet 4 which is then treated in the manner afore described to constitute a catalytic support.
  • a support is thus produced allowing the continuous operation of the burner at a temperature of approximately 800C which is resistant to thermal shocks, which also allows a catalytic reaction which is self maintaining without the application of external heat and whose mechanical resistance is considerable. Moreover, by means of a support of this type, it is possible to generate a catalytic reaction with an oxidizable or reducable reagent whose properties vary from 2 parts per thousand to 20 parts per hundred, whereas the catalyst adheres perfectly and uniformally to this support.
  • a support including catalytic material for use in a burner comprising a mat of metallic fiberous material forming a permeable surface backing, and a multiplicity of metal filaments mounted in and extending perpendicularly from the backing, the metallic fiberous material and the metal filaments having porous oxide surfaces, and said porous oxide surfaces being impregnated with catalytic material.
  • said mat of metallic fiberous backing material comprises a woven fabric, said metal filaments being hooked in the fabric and having their ends extending from at least one side of its surface to form a velvet-like structure.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Catalysts (AREA)
  • Gas Burners (AREA)
US366082A 1972-06-01 1973-06-01 Catalytic supports Expired - Lifetime US3914114A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7220204A FR2187407B1 (de) 1972-06-01 1972-06-01

Publications (1)

Publication Number Publication Date
US3914114A true US3914114A (en) 1975-10-21

Family

ID=9099721

Family Applications (1)

Application Number Title Priority Date Filing Date
US366082A Expired - Lifetime US3914114A (en) 1972-06-01 1973-06-01 Catalytic supports

Country Status (4)

Country Link
US (1) US3914114A (de)
DE (1) DE2327651A1 (de)
FR (1) FR2187407B1 (de)
GB (1) GB1435173A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT405089B (de) * 1996-06-10 1999-05-25 Vaillant Gmbh Heizeinrichtung mit einem atmosphärischen brenner

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1831393A (en) * 1930-04-29 1931-11-10 Jr Winslow S Pierce Magnetic brush
US2545708A (en) * 1946-03-15 1951-03-20 Ronda Button Company Button blank cutting machine
US3437457A (en) * 1965-04-13 1969-04-08 Huyck Corp Reinforced metal fiber composites

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1831393A (en) * 1930-04-29 1931-11-10 Jr Winslow S Pierce Magnetic brush
US2545708A (en) * 1946-03-15 1951-03-20 Ronda Button Company Button blank cutting machine
US3437457A (en) * 1965-04-13 1969-04-08 Huyck Corp Reinforced metal fiber composites

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT405089B (de) * 1996-06-10 1999-05-25 Vaillant Gmbh Heizeinrichtung mit einem atmosphärischen brenner

Also Published As

Publication number Publication date
FR2187407A1 (de) 1974-01-18
DE2327651A1 (de) 1973-12-13
FR2187407B1 (de) 1976-03-12
GB1435173A (en) 1976-05-12

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