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
  • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
  • B01J37/06—Washing
• • 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
• • 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
• • 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
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
  • Y02C20/00—Capture or disposal of greenhouse gases
  • Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)

Definitions

• the invention relates to a process for producing a catalyst for removing nitrogen oxides from exhaust gases with the addition of ammonia, the catalyst consisting of a carbon-containing material which is mixed with a mixed solution of 5 to 20%, in particular 5 to 15%, HCl and 1 to Treated 8%, in particular 2 to 4% HNO 3 with a contact time of 5 to 60 min and after draining the mixed solution at 200 ° C or higher in an N 2 stream and using the exhaust gas from the N 2 treatment is condensed and recycled.
• the catalysts produced by this process known from DE 40 26 104 C1
• quite favorable levels of NO x conversion can already be achieved, although in individual cases NH 3 residues can still occur in the exhaust gas.
• the invention is, starting from a method of the initially mentioned type, the object to further develop this method of manufacture to the extent that the effectiveness of the catalyst of carbonaceous material humbich the recoverable NO x -Umsatzgrades is further improved and a NH 3 - Rest in the exhaust gas be avoided.
• the NO x conversion rate can be increased further with these catalysts.
• Tables 1 to 3 show experimental results which show the further improved effectiveness of catalysts prepared according to the invention in the reduction of nitrogen oxides by means of NH 3 from the exhaust gases from coal-fired power plants, from waste-to-energy plants and from earth rehabilitation plants.
• catalysts were used which were prepared from activated carbons of the applicant's specification D52 / 4 by treatment with a mixed solution of a 10% HCl solution and a 4% HNO 3 solution.
• Table 1 shows that when NO is removed from the exhaust gases from coal-fired power plants by means of catalysts which have additionally been exposed to gaseous NH 3 after treatment with mixed solution, an increase in NO conversion compared to catalysts which have only been treated with the mixed solution of approx. 68 to approx. 71 or from approx. 71 to approx. 77% has been achieved with zero ammonia hatching at the same time.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=6437734

Family Applications (1)

Country Status (2)

Citations (5)

• 1991
  • 1991-08-05 DE DE19914125913 patent/DE4125913C1/de not_active Expired - Lifetime
• 1992
  • 1992-08-01 WO PCT/EP1992/001747 patent/WO1993002775A1/de not_active Ceased

Patent Citations (5)

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