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    CATALYST FOR OXIDATIVE PURIFICATION OF EXHAUST GAS FROM DIESEL ENGINE
    1.
    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.

    A NITROGEN OXIDE STORAGE CATALYST
    3.
    发明专利
    A NITROGEN OXIDE STORAGE CATALYST 未知

    公开(公告)号：CA2285825C

    公开(公告)日：2009-01-20

    申请号：CA2285825

    申请日：1999-10-12

    Applicant: DEGUSSA

    Inventor： STREHLAU WOLFGANG ,  GOBEL ULRICH ,  DOMESLE RAINER

    IPC: B01J20/04 ,  B01D53/56 ,  B01D53/94 ,  B01J23/58 ,  B01J23/63 ,  B01J27/053 ,  B01J27/055 ,  B01J37/02 ,  B01J37/08

    Abstract: The invention relates to a nitrogen oxide storage catalyst which contains at least one catalyst material and at least one nitrogen oxide storage component from the group of alkali and alkaline earth metals. The nitrogen oxide storage catalyst is characterised in that the nitrogen oxide storage component, after completing catalyst preparation, is present as finely divided barium sulfate, strontium sulfate or as a mixture or mixed crystals of the two sulfates or as their complete or incomplete decomposition product with an average particle size of less than 1 m. Barium sulfate and/or strontium sulfate act as feed materials for the active storage component barium oxide in the storage catalyst according to the invention. As a result of the reductive exhaust gas compositions occurring under normal driving conditions barium sulfate and strontium sulfate decompose to compounds which are able to store nitrogen oxides. This more or less compensates for the loss of active storage components which occurs due to ageing. There is also the possibility of decomposing barium sulfate and/or strontium sulfate during production by means of reductive calcination in order to obtain a high initial loading of the catalyst with storage compounds. In this case the sulfates mentioned are used as auxiliary agents in order to introduce the highest possible concentrations of storage compounds into the storage catalyst.

    PROCESS FOR COATING THE FLOW CHANNELS IN A MONOLITHIC CATALYST CARRIER WITH A COATING DISPERSION
    4.
    发明专利
    PROCESS FOR COATING THE FLOW CHANNELS IN A MONOLITHIC CATALYST CARRIER WITH A COATING DISPERSION 未知

    公开(公告)号：CA2280597C

    公开(公告)日：2008-06-03

    申请号：CA2280597

    申请日：1999-08-19

    Applicant: DEGUSSA

    Inventor： KRAMPE WILLI ,  PIROTH JOSEF ,  DOMESLE RAINER ,  FOERSTER MARTIN ,  SCHLACHTER ULRICH

    IPC: B01J37/02 ,  B05D7/24 ,  F01N3/10

    Abstract: The invention relates to a process for coating the flow channels in a monolithic, cylindrically shaped catalyst carrier with a coating dispersion, wherein the carrier has two end faces which are connected to each other by flow channels arranged parallel to the axis of the cylinder, by vertically aligning the axis of the cylindrical carrier, placing a predetermined amount of coating dispersion from a storage container on the upper end face of the carrier and drawing the dispersion through the flow channels under suction, removing excess coating dispersion from the flow channels by emptying the flow channels under suction, returning the excess dispersion to the storage container and fixing the dispersion coating by calcination. The process is characterised in that the coating dispersion is drawn through the flow channels under suction at a rate of flow of 0.1 to 1 m/s and that after completion of passage under suction the excess coating dispersion is removed from the flow channels by applying a suction impulse from below, wherein the suction air is drawn through the flow channels under suction at a rate of flow between 40 and 1 m/s and the excess coating dispersion discharged with the air stream is separated from the air stream within a time of less than 100 ms after discharge from the catalyst carrier.

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