FR2221172A1 - Catalytic redn of nitrogen oxides - in combustion motor waste gases using zeolite contg. transition metals - Google Patents

Catalytic redn of nitrogen oxides - in combustion motor waste gases using zeolite contg. transition metals

Info

Publication number
FR2221172A1
FR2221172A1 FR7408400A FR7408400A FR2221172A1 FR 2221172 A1 FR2221172 A1 FR 2221172A1 FR 7408400 A FR7408400 A FR 7408400A FR 7408400 A FR7408400 A FR 7408400A FR 2221172 A1 FR2221172 A1 FR 2221172A1
Authority
FR
France
Prior art keywords
nitrogen oxides
transition metals
waste gases
pref
exchanged
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
FR7408400A
Other languages
French (fr)
Other versions
FR2221172B3 (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.)
US Atomic Energy Commission (AEC)
Original Assignee
US Atomic Energy Commission (AEC)
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 US Atomic Energy Commission (AEC) filed Critical US Atomic Energy Commission (AEC)
Publication of FR2221172A1 publication Critical patent/FR2221172A1/en
Application granted granted Critical
Publication of FR2221172B3 publication Critical patent/FR2221172B3/fr
Granted legal-status Critical Current

Links

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
    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/18—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the mordenite type
    • B01J29/20—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the mordenite type containing iron group metals, noble metals or copper
    • 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
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9413—Processes characterised by a specific catalyst
    • B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/202—Hydrogen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/204—Carbon monoxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20753—Nickel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20761—Copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/50—Zeolites

Abstract

Poisonous N oxides are reduced by CO and/or H2 in the presence of 2202 by using a zeolite with pore dia. 3-10 angstroms which has been exchanged with a catalytically-active, pref. transition, metal which pref. has an atomic number of 22-30 abd is Ni, or Ni and Cu. The esp. pref. catalyst is mixed synthetic mordenites half of which has been 82% exchanged with Cu and the remaining half of which has been 53% exchanged with Ni. At the normal operating temp. of about 300-550 degrees C, NH3 is not formed; a residence time of ass little as 0.1 sec. will remove N oxides almost completely. The gases remaining after the N oxide redn. may be mixed with air and passed over a catalyst to oxidize hydrocarbons and CO.
FR7408400A 1973-03-13 1974-03-12 Catalytic redn of nitrogen oxides - in combustion motor waste gases using zeolite contg. transition metals Granted FR2221172A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US34080973A 1973-03-13 1973-03-13

Publications (2)

Publication Number Publication Date
FR2221172A1 true FR2221172A1 (en) 1974-10-11
FR2221172B3 FR2221172B3 (en) 1976-12-24

Family

ID=23335025

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7408400A Granted FR2221172A1 (en) 1973-03-13 1974-03-12 Catalytic redn of nitrogen oxides - in combustion motor waste gases using zeolite contg. transition metals

Country Status (4)

Country Link
JP (1) JPS49122475A (en)
DE (1) DE2411853A1 (en)
FR (1) FR2221172A1 (en)
IT (1) IT1005647B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS548351B2 (en) * 1973-09-27 1979-04-14
JPS5242489A (en) * 1976-05-20 1977-04-02 Toa Nenryo Kogyo Kk Nox-reduction catalyst and method of producing thereof
US4297328A (en) * 1979-09-28 1981-10-27 Union Carbide Corporation Three-way catalytic process for gaseous streams
DE3544476A1 (en) * 1985-12-16 1987-06-19 Sued Chemie Ag IRONED CATALYST FOR REDUCING THE NITROGEN OXIDE CONTENT OF COMBUSTION EXHAUST GASES
DE3635284A1 (en) * 1986-10-16 1988-04-28 Steuler Industriewerke Gmbh CATALYST FOR REMOVING NITROGEN OXIDS FROM EXHAUST GAS
FR2622474B2 (en) * 1987-04-03 1990-01-26 Azote & Prod Chim CATALYTIC COMPOSITION FOR THE SELECTIVE REDUCTION OF NITROGEN OXIDES CONTAINED IN OXYGENOUS GAS EFFLUENTS AND METHOD FOR THE PURIFICATION OF SUCH EFFLUENTS
JPH01310742A (en) * 1988-06-07 1989-12-14 Toyota Motor Corp Catalyst for use in purification of exhaust gas
DE3841990A1 (en) * 1988-12-14 1990-06-21 Degussa PROCESS FOR REDUCING STICK OXIDES FROM EXHAUST GASES
DE19728701A1 (en) * 1997-07-04 1999-01-07 Metallgesellschaft Ag Process for the production of fine-grained catalysts from naturally occurring zeolite

Also Published As

Publication number Publication date
IT1005647B (en) 1976-09-30
DE2411853A1 (en) 1974-09-19
FR2221172B3 (en) 1976-12-24
JPS49122475A (en) 1974-11-22

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Legal Events

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