FR2433975A1 - Precious metal catalyst cloth crushing - to increase surface area and hence increase conversion of gases per unit precious metal - Google Patents

Precious metal catalyst cloth crushing - to increase surface area and hence increase conversion of gases per unit precious metal

Info

Publication number
FR2433975A1
FR2433975A1 FR7824736A FR7824736A FR2433975A1 FR 2433975 A1 FR2433975 A1 FR 2433975A1 FR 7824736 A FR7824736 A FR 7824736A FR 7824736 A FR7824736 A FR 7824736A FR 2433975 A1 FR2433975 A1 FR 2433975A1
Authority
FR
France
Prior art keywords
precious metal
cloth
increase
surface area
per unit
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.)
Granted
Application number
FR7824736A
Other languages
French (fr)
Other versions
FR2433975B1 (en
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.)
LOUYOT COMPTOIR LYON ALEMAND
Original Assignee
LOUYOT COMPTOIR LYON ALEMAND
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 LOUYOT COMPTOIR LYON ALEMAND filed Critical LOUYOT COMPTOIR LYON ALEMAND
Priority to FR7824736A priority Critical patent/FR2433975A1/en
Publication of FR2433975A1 publication Critical patent/FR2433975A1/en
Application granted granted Critical
Publication of FR2433975B1 publication Critical patent/FR2433975B1/fr
Granted legal-status Critical Current

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
    • B01J35/58—
    • 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

Abstract

Catalytic cloth of precious metal or alloy is prepd. by weaving a thread of the metal and the cloth produced is then crushed by any mechanical method which will increase the specific surface of the cloth. The metal is pref. Pt or a Pt alloy used to a catalyse oxidn. of NH3. The Pt (alloy) is pref. aprox. 60 mu thread woven into a cloth with 500-1000 (600-800) openings/cm2. After crushing the cloth thickness measured at the middle of the side of an opening is pref. 20-55 mu (30-45 mu). Used for oxidn. of gases, esp. oxidn. of ammonia to nitric oxide for mfr. of nitric acid. The increased specific surface provides improved yield of catalytic conversion of the gases, with redn. in the amt. of catalyst required.
FR7824736A 1978-08-25 1978-08-25 Precious metal catalyst cloth crushing - to increase surface area and hence increase conversion of gases per unit precious metal Granted FR2433975A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7824736A FR2433975A1 (en) 1978-08-25 1978-08-25 Precious metal catalyst cloth crushing - to increase surface area and hence increase conversion of gases per unit precious metal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7824736A FR2433975A1 (en) 1978-08-25 1978-08-25 Precious metal catalyst cloth crushing - to increase surface area and hence increase conversion of gases per unit precious metal

Publications (2)

Publication Number Publication Date
FR2433975A1 true FR2433975A1 (en) 1980-03-21
FR2433975B1 FR2433975B1 (en) 1982-01-15

Family

ID=9212100

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7824736A Granted FR2433975A1 (en) 1978-08-25 1978-08-25 Precious metal catalyst cloth crushing - to increase surface area and hence increase conversion of gases per unit precious metal

Country Status (1)

Country Link
FR (1) FR2433975A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3042362A1 (en) * 1979-11-08 1981-05-21 Johnson, Matthey & Co., Ltd., London CATALYST UNIT
FR2536301A1 (en) * 1982-11-18 1984-05-25 Bekaert Sa Nv CATALYST, METHODS FOR ITS PREPARATION AND ITS APPLICATION
FR2694306A1 (en) * 1992-07-31 1994-02-04 Louyot Comptoir Lyon Alemand Wires comprising a helical element, their assemblies and the use of said assemblies as catalyst and / or for recovering precious metals.
EP0606535A1 (en) * 1993-01-14 1994-07-20 W.C. Heraeus GmbH Knitted fabric of noble metal wires and process for its manufacture

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3874645A (en) * 1970-09-04 1975-04-01 Ugine Kuhlmann Permeable laminated composite unit for physico-chemical processing

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3874645A (en) * 1970-09-04 1975-04-01 Ugine Kuhlmann Permeable laminated composite unit for physico-chemical processing

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3042362A1 (en) * 1979-11-08 1981-05-21 Johnson, Matthey & Co., Ltd., London CATALYST UNIT
FR2536301A1 (en) * 1982-11-18 1984-05-25 Bekaert Sa Nv CATALYST, METHODS FOR ITS PREPARATION AND ITS APPLICATION
FR2694306A1 (en) * 1992-07-31 1994-02-04 Louyot Comptoir Lyon Alemand Wires comprising a helical element, their assemblies and the use of said assemblies as catalyst and / or for recovering precious metals.
WO1994003665A1 (en) * 1992-07-31 1994-02-17 Comptoir Lyon-Alemand-Louyot Wires incorporating a helical component, assemblies thereof, and use of said assemblies as catalyser and/or to recover precious metals
TR26971A (en) * 1992-07-31 1994-09-12 Louyot Comptoir Lyon Alemand Yarns consisting of a helical element are used to assemble these yarns and to use said assemblies as catalysts and / or to recover precious metals.
EP0606535A1 (en) * 1993-01-14 1994-07-20 W.C. Heraeus GmbH Knitted fabric of noble metal wires and process for its manufacture
TR28405A (en) * 1993-01-14 1996-06-14 Heraeus Gmbh W C Verve braided texture of wires containing noble metal and the method for its production.
US6089051A (en) * 1993-01-14 2000-07-18 W.C. Heraeus Gmbh Warp-knit fabric of noble metal-containing wires, and method for the production thereof

Also Published As

Publication number Publication date
FR2433975B1 (en) 1982-01-15

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Legal Events

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