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WO1986001741A1 - CATALYSEURS EN FORME DE NID D'ABEILLE, RECOUVERTS D'UN MATERIAU CATALYTIQUEMENT ACTIF POUR LA REDUCTION DU NOx, ET PROCEDE DE FABRICATION - Google Patents

CATALYSEURS EN FORME DE NID D'ABEILLE, RECOUVERTS D'UN MATERIAU CATALYTIQUEMENT ACTIF POUR LA REDUCTION DU NOx, ET PROCEDE DE FABRICATION Download PDF

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Publication number
WO1986001741A1
WO1986001741A1 PCT/EP1985/000448 EP8500448W WO8601741A1 WO 1986001741 A1 WO1986001741 A1 WO 1986001741A1 EP 8500448 W EP8500448 W EP 8500448W WO 8601741 A1 WO8601741 A1 WO 8601741A1
Authority
WO
WIPO (PCT)
Prior art keywords
honeycomb
honeycomb catalysts
carbon
production
reduction
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.)
Ceased
Application number
PCT/EP1985/000448
Other languages
German (de)
English (en)
Inventor
Harald JÜNTGEN
Karl Knoblauch
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.)
Bergwerksverband GmbH
Original Assignee
Bergwerksverband GmbH
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 Bergwerksverband GmbH filed Critical Bergwerksverband GmbH
Publication of WO1986001741A1 publication Critical patent/WO1986001741A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
    • B01J21/18—Carbon
    • 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

Definitions

  • the invention relates to honeycomb catalysts coated with catalytically active material for reducing nitrogen oxides from exhaust gases, which contain NO x and optionally SO 2 , and to a process for producing such honeycomb catalysts.
  • honeycomb catalysts are known from US Pat. No. 4,282,115. With them it is advantageous that they are suitable for dust-containing exhaust gases.
  • these honeycomb catalysts require high temperatures (approx. 350 ° C.) for the NO x reduction, because the catalytically active materials used (metal oxides and sulfates) only catalyze the NO x reduction adequately at higher temperatures.
  • the invention has for its object to find a honeycomb catalyst that works at lower temperatures.
  • this object is achieved by coating with carbon-containing substances.
  • honeycomb bodies provided with a layer of carbon e.g. can consist of aluminum, titanium dioxide and amorphous or crystalline aluminosilicates, have a catalytic activity for the reduction of nitrogen oxides.
  • These catalysts can be produced using gaseous or liquid hydrocarbons by processes known per se.
  • the honeycomb body (monolith) can be treated at temperatures between 300 and 900 ° C. with carbon-releasing hydrocarbons, which react on the carrier material with the deposition of carbon-containing products.
  • the catalyst support can be impregnated with carbonaceous material with a boiling point of 100 to 500 ° C, optionally in vacuo down to 5 Torr, and then heated to temperatures up to 900 ° C.
  • the coated catalyst supports are treated by treatment, for. B. activated with steam.
  • the catalysts are also suitable for the simultaneous deposition of SO 2 and NO x .
  • the catalyst is deactivated by ammonium sulfate.
  • the catalyst can be easily, e.g. B. by blowing out, washing with water or by heating to temperatures above 350 ° C.
  • the monolith coated in this way is treated with a gas flow of 1.5 m 3 / h (iN) with a gas composition of 790 ppm NO, 790 ppm NH 3 , 6.4% by volume O 2 , 9.8% by volume H 2 O, rest N 2 , at 90 ° C.
  • the NO exit concentrations are measured at 290 ppm, corresponding to a degree of NO conversion of 63%.
  • the aluminum silicate monolith is treated with 0.6 parts by weight of pitch in 60 parts by weight of benzene by immersion for 15 minutes. The excess solution is then filtered off and the monolith is dried at 110 ° C. for one hour. The monolith is then heated at 600 C for five hours in a stream of nitrogen.
  • the monolith coated in this way is treated with a gas flow of 1.5 m 3 / h (iN) with a gas composition of 790 ppm NO, 790 ppm NH 3 , 6.4% by volume O 2 , 8% by volume H 2 O , Rest N 2 , at 90 ° C.
  • the NO leakage concentrations are measured at 350 ppm, corresponding to a degree of NO conversion of 56%.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biomedical Technology (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Health & Medical Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Catalysts (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

Des catalyseurs en forme de nid d'abeille pour la réduction des oxydes d'azote dans les gaz d'échappement qui contiennent du NOx et éventuellement du SO2, dans lesquels le catalyseur en forme de nid d'abeille est recouvert de carbone. Ces catalyseurs conviennent également à la séparation simultanée du SO2 et du NOx.
PCT/EP1985/000448 1984-09-08 1985-09-04 CATALYSEURS EN FORME DE NID D'ABEILLE, RECOUVERTS D'UN MATERIAU CATALYTIQUEMENT ACTIF POUR LA REDUCTION DU NOx, ET PROCEDE DE FABRICATION Ceased WO1986001741A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3433093.3 1984-09-08
DE19843433093 DE3433093A1 (de) 1984-09-08 1984-09-08 Mit katalytisch aktivem material beschichtete wabenkatalysatoren zur no(pfeil abwaerts)x(pfeil abwaerts)-reduktion und verfahren zu deren herstellung

Publications (1)

Publication Number Publication Date
WO1986001741A1 true WO1986001741A1 (fr) 1986-03-27

Family

ID=6244975

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1985/000448 Ceased WO1986001741A1 (fr) 1984-09-08 1985-09-04 CATALYSEURS EN FORME DE NID D'ABEILLE, RECOUVERTS D'UN MATERIAU CATALYTIQUEMENT ACTIF POUR LA REDUCTION DU NOx, ET PROCEDE DE FABRICATION

Country Status (3)

Country Link
JP (1) JPS62500158A (fr)
DE (1) DE3433093A1 (fr)
WO (1) WO1986001741A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988007410A1 (fr) * 1987-03-28 1988-10-06 Bergwerksverband Gmbh Procede de production de catalyseurs au carbone
US7399729B2 (en) 2003-12-22 2008-07-15 General Electric Company Catalyst system for the reduction of NOx

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02303518A (ja) * 1989-05-16 1990-12-17 Canon Inc 電子写真装置
ATE146694T1 (de) * 1992-10-08 1997-01-15 Siemens Ag Katalysator zur verminderung der stickoxide im rauchgas und verfahren zu seiner herstellung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3887683A (en) * 1972-08-23 1975-06-03 Shinetsu Handotai Kk Method for removing nitrogen oxides from waste gases
US4210628A (en) * 1973-07-12 1980-07-01 Takeda Chemical Industries, Ltd. Removal of nitrogen oxides

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1391509A (en) * 1971-08-25 1975-04-23 Ford Motor Co Method for decreasing nitrogen oxides in exhaust gases
GB1488383A (en) * 1973-09-21 1977-10-12 Cornell Res Foundation Inc Method and means for reducing pollutants from the exhaust of hydrocarbon fuel combustion means
US4186109A (en) * 1976-09-30 1980-01-29 Mitsubishi Jukogyo Kabushiki Kaisha Catalyst for selectively reducing nitrogen oxides from oxygen-containing exhaust gases
DE2753674A1 (de) * 1977-12-02 1979-06-07 Hoechst Ag Verfahren zur herstellung abriebfester aktivkohletraeger oder -katalysatoren
DE2911712C2 (de) * 1979-03-24 1991-10-31 Bergwerksverband Gmbh, 4300 Essen Verfahren zur Entfernung von Schwefeloxiden und Stickstoffoxiden aus Abgasen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3887683A (en) * 1972-08-23 1975-06-03 Shinetsu Handotai Kk Method for removing nitrogen oxides from waste gases
US4210628A (en) * 1973-07-12 1980-07-01 Takeda Chemical Industries, Ltd. Removal of nitrogen oxides

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988007410A1 (fr) * 1987-03-28 1988-10-06 Bergwerksverband Gmbh Procede de production de catalyseurs au carbone
US5064801A (en) * 1987-03-28 1991-11-12 Juentgen Harald Process for manufacturing a carbon catalyst
US7399729B2 (en) 2003-12-22 2008-07-15 General Electric Company Catalyst system for the reduction of NOx

Also Published As

Publication number Publication date
DE3433093A1 (de) 1986-03-20
JPS62500158A (ja) 1987-01-22

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