US3589853A - Catalytic wall - Google Patents

Catalytic wall Download PDF

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Publication number
US3589853A
US3589853A US709527A US3589853DA US3589853A US 3589853 A US3589853 A US 3589853A US 709527 A US709527 A US 709527A US 3589853D A US3589853D A US 3589853DA US 3589853 A US3589853 A US 3589853A
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US
United States
Prior art keywords
wall
catalytic
deposit
face
platinum
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
US709527A
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English (en)
Inventor
Raymond J Guasco
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.)
Perodo SA Franc
Sa Francaise Du Perodo
Valeo SE
Original Assignee
Perodo SA Franc
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
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Assigned to VALEO reassignment VALEO CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE OCTOBER 24, 1980, FRANCE Assignors: SOCIETE ANONYME FRANCAISE DU FERODO,
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D99/00—Subject matter not provided for in other groups of this subclass
    • F23D99/002—Burners specially adapted for specific applications
    • F23D99/004—Burners specially adapted for specific applications for use in particular heating operations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2206/00—Burners for specific applications
    • F23D2206/0057—Liquid fuel burners adapted for use in illumination and heating
    • F23D2206/0063—Catalytic burners adapted for use in illumination and heating

Definitions

  • ABSTRACT A catalytic wall adapted to be cross through by a gaseous flow from an internal face to an external face in order to facilitate the reaction between said gaseous flow and a gaseous medium bathing the external face, comprising an asbestos based fabric support carrying on the input face a'quantity of catalyst smaller than the one provided on the face bathing in said gaseous medium.
  • a wall can be used in a catalytic heater apparatus.
  • CATALYTIC wALL This invention relates to improvements in catalyst supports designed for increasing the efficiency of heterogeneous catalytic reactions.
  • This invention is applicable in general to the construction of catalytic apparatus of the type comprising an enclosure for distributing the reagents, and a catalyst carried by a corresponding support which may be a wall or be an integral part of, a wall or partition.
  • the invention is applicable, more particularly, to heating appliances of the catalytic type which comprise a chamber (containing for example mineral wool or the like) for distributing the reagent or reagents, this chamber being limited by a pervious wall or partition (asbestos fabric or the like) which is the support of the combustion catalyst, and through which at least one of the reagents is caused to flow.
  • a chamber containing for example mineral wool or the like
  • a pervious wall or partition asbestos fabric or the like
  • the present invention is thus concerned with apparatus for the catalytic combustion of gas, and mainly catalytic stoves comprising in contact with the atmospheric air, a catalytic wall or partition through which the gas is caused to flow to make the desired combustion.
  • the applicant found that if starting from a wall on which has been sprayed, on the face in contact with the atmosphere, the quantity of catalytic product beyond which no increment in the catalytic reaction takes place the catalytic property of this wall can be considerably improved by applying catalytic product to the opposite face of the wall but in a smaller quantity than that applied to the first face.
  • a catalytic wall according to the invention pervious to gaseous reagents and comprising a support for the catalytic product, particularly in a fabric made basically of asbestos, is characterized in that the quantity of catalytic product is smaller on the gas inlet face of the wall than on the gas outlet face thereof.
  • the quantity of catalytic product applied per surface unit to the gas inlet face of the wall ranges from about 25 percent to about percent of the quantity of catalytic product applied per surface unit to the gas outlet face of the wall. This percentage is advantageously of the order of 50 percent.
  • the catalytic product is present in a substantially uniform manner on the inner face, in smaller amount than on the outer face.
  • the invention also contemplates an embodiment wherein the catalytic product is present only on certain zones of the inner face, at the most on about 80 percent of its surface and advantageously at the most on 50 percent.
  • the invention contemplates a specific embodiment characterized in that the quantity of catalytic product present per surface unit on the inner face is greater in the zones where the fuel gas output is smaller. 7
  • the catalytic product is applied only to the upper portion of the inner face of the wall pervious to the gaseous reagents.
  • This invention is particularly advantageous when applied to a wall in a fabric made basically of asbestos treated by brushing its outer face for bristling up the fibers thereof.
  • FIG. l to 3 show explanatory diagrams
  • FIGS. 4 and 5 show, respectively, in a schematic way, a catalytic wall and a catalytic apparatus.
  • FIG. 6 is a section on the line 6 6 of FIG. 5 and shows a catalytic wall having different quantities of catalytic product on opposite sides thereof.
  • FIG. 7 is an enlarged fragmentary section of a modified form of catalytic apparatus.
  • Example A plurality of catalytic walls have been constructed which differed from each other only by the distribution or arrangement of the catalytic product.
  • the fabric is an asbestos fabric (warp 30 I This asbestos fabric was brushed on one face, to bristle up the fibers thereof.
  • the catalytic product consisting of a platinum base substance was applied by spraying a suspension in an alcohol medium.
  • Three walls after a heating step for reducing the catalytic product into a catalyst, are mounted in succession in a stove so that their brushed or outer face contacts the atmospheric air.
  • Curve I (FIG. 1) relates to a wall the outer face of which was sprayed with a quantity of catalytic product, per surface unit, which was arbitrarily selected as being equal to I, this quantity representing the value beyond which the addition of a complementary quantity of catalytic product per surface unit does not increase the catalytic action of the wall; no catalytic product was sprayed onto the inner face of this wall.
  • the characteristics of a wall are denoted by the expression a b/c d wherein u designates the external surface, 12 the quantity of catalytic product applied per surface un it to the external face, 0 the internal surface and d the quantity of catalytic product applied per surface unit to this internal surface, then the characteristics of the first wall, as concerns the applied catalytic product, can be expressed as l l/lXO in other 27, single weft much catalytic product, sprayed by equal amounts over its entire external surface and over its entire internal surface, the resulting curve is line II (FIG. 1).
  • the wall corresponding to curve 15 is the most advantageous since it gave practically equivalent results from the point of view of the percentage of unburnt products (in ordinates) by using a lesser amount of catalytic product.
  • FIG. 4 there is shown schematically a catalytic wall according to the invention with an inner face 20 and an outer face 21 presenting bristled fibers 22.
  • the direction of flow of the gaseous reagents is indicated by arrow F.
  • FIG. 5 illustrates schematically a catalytic stove according to the invention with a catalytic wall 23 adjacent to the distribution chamber 24 to which is connected a gas feeding pipe 25.
  • FIG. 6 shows an enlarged section of the catalytic wall 23 having outer and inner surfaces 26 and 27, respectively.
  • a first deposit 28 of a reaction catalyst is sprayed on or otherwise applied to the outer surface 26 and a smaller second deposit 29 of a reaction catalyst is sprayed on or otherwise applied to the inner surface 27.
  • FIG. 7 illustrates a modified form of catalytic apparatus in which the wall 23 is provided with a first deposit 28 of a reaction catalyst applied to the outer surface 26 and a second deposit 29 applied to the upper portion only of the inner surface 27.
  • a catalytic wall according to claim 1 wherein said face of the wall bathed by said gaseous medium is brushed for bristling up its fibers before the application of said first deposit.
  • a catalytic wall according to claim 1 said wall being arranged in a substantially vertical position and wherein said gaseous flow is a gas heavier than air and wherein the platinum of said second deposit is applied on the face opposed to that bathed by said gaseous medium only at the upper portion of said substantially vertical wall.
  • a catalytic wall for improving the reaction between a combustible gas and atmospheric air in a catalytic heater means, said wall comprising a gas pervious fabric having inner and outer surfaces, a first deposit of platinum saturating said outer surface so that additional platinum does not increase the catalytic action, a second deposit of platinum on said inner surface, said second deposit being smaller than said first deposit so that said combustible gas flows through said wall from said inner surface to said outer surface and reacts with the air at said outer surface.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Catalysts (AREA)
US709527A 1967-02-16 1968-02-12 Catalytic wall Expired - Lifetime US3589853A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR95254 1967-02-16

Publications (1)

Publication Number Publication Date
US3589853A true US3589853A (en) 1971-06-29

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ID=8625413

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US709527A Expired - Lifetime US3589853A (en) 1967-02-16 1968-02-12 Catalytic wall

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US (1) US3589853A (en)van)
BE (1) BE710861A (en)van)
DE (1) DE1667282C3 (en)van)
ES (1) ES350541A1 (en)van)
FR (1) FR1575514A (en)van)
GB (1) GB1216901A (en)van)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3928280A (en) * 1972-03-03 1975-12-23 Wallace A Erickson & Company Preparation of dental restorative filling materials
US4850859A (en) * 1988-09-30 1989-07-25 United Technologies Corporation Liquid fueled hydrogen heater
US5464346A (en) * 1994-09-30 1995-11-07 Mersden Manufacturing Co. Infra-red heater for treating substrates

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3191659A (en) * 1958-04-07 1965-06-29 American Thermocatalytic Corp Radiant gas burner
US3198240A (en) * 1962-09-04 1965-08-03 Engelhard Ind Inc Catalytic oxidation unit and radiant gas burner
FR1487675A (fr) * 1966-07-25 1967-07-07 Sangotoki Kabushiki Kaisha élément de brûleur
US3472601A (en) * 1967-12-12 1969-10-14 Sango Toki Radiant gas burner element

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3191659A (en) * 1958-04-07 1965-06-29 American Thermocatalytic Corp Radiant gas burner
US3198240A (en) * 1962-09-04 1965-08-03 Engelhard Ind Inc Catalytic oxidation unit and radiant gas burner
FR1487675A (fr) * 1966-07-25 1967-07-07 Sangotoki Kabushiki Kaisha élément de brûleur
US3472601A (en) * 1967-12-12 1969-10-14 Sango Toki Radiant gas burner element

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3928280A (en) * 1972-03-03 1975-12-23 Wallace A Erickson & Company Preparation of dental restorative filling materials
US4850859A (en) * 1988-09-30 1989-07-25 United Technologies Corporation Liquid fueled hydrogen heater
US5464346A (en) * 1994-09-30 1995-11-07 Mersden Manufacturing Co. Infra-red heater for treating substrates

Also Published As

Publication number Publication date
ES350541A1 (es) 1969-05-01
DE1667282A1 (de) 1972-02-10
DE1667282C3 (de) 1974-11-14
DE1667282B2 (de) 1974-04-11
FR1575514A (en)van) 1969-07-25
BE710861A (en)van) 1968-08-16
GB1216901A (en) 1970-12-23

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Owner name: VALEO

Free format text: CHANGE OF NAME;ASSIGNOR:SOCIETE ANONYME FRANCAISE DU FERODO,;REEL/FRAME:004050/0883

Effective date: 19810213

Owner name: VALEO,

Free format text: CHANGE OF NAME;ASSIGNOR:SOCIETE ANONYME FRANCAISE DU FERODO,;REEL/FRAME:004050/0883

Effective date: 19810213