中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

250 records (took 0.017 seconds)

    CATALYST FOR PURIFYING EXHAUST GAS FROM DIESEL ENGINE
    3.
    发明专利
    CATALYST FOR PURIFYING EXHAUST GAS FROM DIESEL ENGINE 失效

    公开(公告)号：JP2000157870A

    公开(公告)日：2000-06-13

    申请号：JP33814299

    申请日：1999-11-29

    Applicant: DEGUSSA

    Inventor： KLEIN HARALD DR ,  STREHLAU WOLFGANG DR ,  LOX EGBERT ,  KREUZER THOMAS DR ,  MUELLER WILFRIED

    IPC: B01D53/94 ,  B01J23/58 ,  B01J23/63 ,  B01J29/068 ,  B01J29/12 ,  B01J29/44 ,  B01J37/02 ,  F01N3/10 ,  F02B3/06

    Abstract: PROBLEM TO BE SOLVED: To obtain the superior nitrogen oxide conversion rate on a continuous lean fuel-air mixture operation zone by additionally providing a second functional layer with hydrocarbon storage function for a catalyst having two functional layers consisting of a first layer of nitrogen oxide storage function and the second layer of catalyst function. SOLUTION: A catalyst for converting a nitrogen oxide in an oxygen rich exhaust gas from a diesel engine under the optimum utilization of a reducing component contained in exhaust gas is provided with a second functional layer absorbing the catalyst activities and also hydrocarbon contained in a lean exhaust gas and formed on a first functional layer of function of storing the nitrogen oxide. As an acidic carrier material for the catalyst activity component in the second functional layer, for example, aluminum silicate, silicon dioxide, titanium oxide or zirconium oxide can be used. The second functional layer contains aluminum-removed Y-zeolite, zeolite ZMS5, aluminumremoved mordenite or a mixture of them.

    CATALYST FOR OXIDATIVE PURIFICATION OF EXHAUST GAS FROM DIESEL ENGINE
    4.
    发明专利
    CATALYST FOR OXIDATIVE PURIFICATION OF EXHAUST GAS FROM DIESEL ENGINE 失效

    公开(公告)号：JPH067677A

    公开(公告)日：1994-01-18

    申请号：JP9283093

    申请日：1993-04-20

    Applicant: DEGUSSA

    Inventor： LEYRER JUERGEN ,  LOX EGBERT ,  ENGLER BERND ,  DOMESLE RAINER

    IPC: F01N3/10 ,  B01D53/94 ,  B01J23/64 ,  B01J23/648 ,  B01J29/04 ,  B01J35/04 ,  B01J37/00 ,  B01J37/02 ,  F02B3/06 ,  B01D53/36

    Abstract: PURPOSE: To obtain a catalyst having a high conversion rate for hydrocarbons and carbon monoxide by using doped platinum, etc., as an active component in a monolithic catalyst element with throughflow passages of ceramic etc., coated with an activity-promoting dispersion coating. CONSTITUTION: A fine particulate metal oxide is surface-modified Al oxide, titanium oxide, silicon oxide, zeolite or a mixture thereof which is obtained by mixing the fine particulate metal oxide or the mixture thereof into an alcoholic soln. of a precursor for titanium oxide and/or silicon oxide with stirring, removing the alcoholic solvent with stirring continuously, drying the residual solid at a elevated temp., and after pulverization, calcining titanium dioxide or silicon dioxide at 300-600 deg.C for 0.5-4 hours while decomposing the precursor for titanium oxide and/or silicon oxide. Platinum, Pd, Rh and/or Ir doped with V is (are), included as (an) active component(s) on the carrier.

    SELECTIVE CATALYTIC REDUCTION OF NITROGEN OXIDE CONTAINED IN POOR EXHAUST GAS
    5.
    发明专利
    SELECTIVE CATALYTIC REDUCTION OF NITROGEN OXIDE CONTAINED IN POOR EXHAUST GAS 失效

    公开(公告)号：JP2000271447A

    公开(公告)日：2000-10-03

    申请号：JP2000022740

    申请日：2000-01-31

    Applicant: DEGUSSA

    Inventor： GIESHOFF JUERGEN DR ,  VAN DEN TILLAART HANS DR ,  KREUZER THOMAS DR ,  LOX EGBERT

    IPC: B01D53/32 ,  B01D53/86 ,  B01D53/94 ,  B01J21/04 ,  B01J23/22 ,  B01J23/42 ,  B01J23/44 ,  B01J23/58 ,  F01N3/10 ,  F01N3/20 ,  F01N13/02

    Abstract: PROBLEM TO BE SOLVED: To selectively reduce nitrogen oxide in poor exhaust gas by, while forming ammonia in a rich gas flow by reaction between components thereof, combining poor exhaust gas with the rich gas flow and reducing the nitrogen oxide in the proof exhaust gas by ammonia on a reducing catalyst. SOLUTION: When cleaning poor exhaust gas discharged from an engine, when producing, from a rich gas flow, ammonia required for catalytic reduction by reaction between components thereof, by passing the rich gas flow through a gas discharge plasma, ammonia is formed in the rich gas flow. At this time, two metal electrodes 2 and 2' opposite to each other connected to an AC voltage source 5 are provided, and in order to restrain the formation of a discharge arc between the two electrodes 2 and 2', the electrode 2 is covered with a dielectric 4. And poor exhaust gas of an engine is combined with the rich gas flow, and the nitrogen oxide in the poor exhaust gas is reduced by the formed ammonia on the reducing catalyst, thereby selectively reducing the nitrogen oxide.

    A PROCESS FOR PREPARING A CATALYST WITH A HIGHLY DISPERSED CATALYTICALLY-ACTIVE COATING
    7.
    发明专利
    A PROCESS FOR PREPARING A CATALYST WITH A HIGHLY DISPERSED CATALYTICALLY-ACTIVE COATING 未知

    公开(公告)号：CA2255278C

    公开(公告)日：2007-08-21

    申请号：CA2255278

    申请日：1998-12-03

    Applicant: DEGUSSA

    Inventor： KLEIN HARALD ,  KREUZER THOMAS ,  LOX EGBERT ,  DOMESLE RAINER ,  LEYRER JURGEN

    IPC: B01J31/16 ,  B01J37/02 ,  B01J23/40 ,  B01J35/10

    Abstract: The invention relates to a process for preparing a catalyst which has a catalytically-active coating of high surface area finely-divided materials and catalytically-active components on an inert support structure. A powder mixture of the finely-divided materials used is impregnated with a solution of precursor compounds of the catalytically-active components. By suitable combination of the finely-divided materials and the precursor compounds, and appropriate management of the impregnation process, a highly dispersed deposition and adsorption of the catalytically-active components is ensured on the finely-divided materials. Then an aqueous coating dispersion is produced using the impregnated powder mixture, and the support structure is coated therewith. The coating is then dried and calcined.

Patent Agency Ranking