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    OPERATION METHOD OF EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
    1.
    发明专利
    OPERATION METHOD OF EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 失效

    公开(公告)号：JPH11350945A

    公开(公告)日：1999-12-21

    申请号：JP8438999

    申请日：1999-03-26

    Applicant: DEGUSSA

    Inventor： STREHLAU WOLFGANG DR ,  GOEBEL ULRICH ,  LOX EGBERT DR ,  MUELLER WILFRIED ,  DOMESLE RAINER DR

    IPC: B01D53/86 ,  B01D53/94 ,  B01J21/16 ,  F01N3/08 ,  F01N3/10 ,  F01N3/20 ,  F01N3/24 ,  F01N3/28 ,  F01N9/00 ,  F01N13/02 ,  F02D41/02 ,  F02D41/14

    Abstract: PROBLEM TO BE SOLVED: To achieve the operation method of the exhaust emission control device for the internal combustion engine which is operated at lean air/fuel ratio for the main course of its operation. SOLUTION: An exhaust emission control device incorporating a nitrogen oxides storage catalytic converter and a sulfur trap, wherein: a) at the excess air factor higher than 1 and an exhaust gas temperature TK within an activity window ΔTNOX, the nitrogen oxides and the sulfur oxides contained in the exhaust gas are respectively stored on the nitrogen oxides storage catalyst and the sulfur oxides storage catalyst while simultaneously maintaining the exhaust gas temperature TS lower than the desulfurization temperature TS. De SOx and periodically reducing the excess air factor of the exhaust gas below 1 to discharge the stored nitrogen oxides (completion of 1 adsorption cycle); b) after each completion of a predetermined number N1 of cycles of nitrogen oxides adsorption cycle, the exhaust gas temperature TS is raised to a level at or higher than the desulfurization temperature TS. De SOx of the sulfur trap to desulfurize the sulfur trap and to reduce the excess air factor of the exhaust gas to below 1. The process a) and the process b) are periodically repeated.

    CATALYST FOR PURIFYING EXHAUST GAS FROM DIESEL ENGINE
    2.
    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.

    PROCESS FOR OPERATING AN EXHAUST GAS TREATMENT UNIT
    7.
    发明专利
    PROCESS FOR OPERATING AN EXHAUST GAS TREATMENT UNIT 未知

    公开(公告)号：CA2267010A1

    公开(公告)日：1999-09-27

    申请号：CA2267010

    申请日：1999-03-26

    Applicant: DEGUSSA

    Inventor： DOMESLE RAINER ,  MUELLER WILFRIED ,  LOX EGBERT ,  STREHLAU WOLFGANG ,  GOEBEL ULRICH

    IPC: B01D53/86 ,  B01D53/94 ,  B01J21/16 ,  F01N3/08 ,  F01N3/10 ,  F01N3/20 ,  F01N3/24 ,  F01N3/28 ,  F01N9/00 ,  F01N13/02 ,  F02D41/02 ,  F02D41/14 ,  B01D53/92

    Abstract: The invention relates to a process for operating an exhaust gas treatment unit for an internal combustion engine which is operated with lean normalised air/fuel ratios over most of the operating period. The exhaust gas treatment unit contains a nitrogen oxides storage catalyst with an activity window .DELTA.T NOX for the storage of nitrogen oxides at normalised air/fuel ratios of greater than 1 and release of the nitrogen oxides at normalised air/fuel ratios of less than or equal to 1 and a sulfur trap, located upstream of the nitrogen oxides storage catalyst, with a sulfur desorption temperature T S,DeSOx above which the sulfates stored on the sulfur trap are decomposed at normalised air/fuel ratios of less than or equal to 1. The nitrogen oxides contained in the exhaust gas are stored on the nitrogen oxides storage catalyst and the sulfur oxides are stored on the sulfur trap at normalised air/fuel ratios greater than 1 and exhaust gas temperatures T K within the activity window T NOX, wherein at the same time the exhaust gas temperature just upstream of the sulfur trap is lower than its sulfur desorption temperature T S,DeSOx. By cyclic lowering of the normalised air/fuel ratio in the exhaust gas to less than 1 the stored nitrogen oxides are released again from the storage catalyst. (Conclusion of a storage cycle). After each predetermined number N1 of nitrogen oxides storage cycles, sulfur is removed from the sulfur trap. This takes place by raising the exhaust gas temperature just upstream of the sulfur trap to above its sulfur desorption temperature T S,DeSOx and also lowering the normalised air/fuel ratio in the exhaust gas to less than 1.

    9.
    发明专利
    未知

    公开(公告)号：BR9901346A

    公开(公告)日：2000-04-18

    申请号：BR9901346

    申请日：1999-03-29

    Applicant: DEGUSSA

    Inventor： STREHLAU WOLFGANG ,  GOEBEL ULRICH ,  LOX EGBERT ,  MUELLER WILFRIED ,  DOMESLE RAINER

    IPC: B01D53/86 ,  B01D53/94 ,  B01J21/16 ,  F01N3/08 ,  F01N3/10 ,  F01N3/20 ,  F01N3/24 ,  F01N3/28 ,  F01N9/00 ,  F01N13/02 ,  F02D41/02 ,  F02D41/14

    Abstract: An internal combustion engine (2) exhaust gas purification device (1) is operated predominantly using lean air-fuel ratios. It has a sulfur filter (5) followed by a NOx storage catalyzer (6). Process for operating an internal combustion engine exhaust gas purification device comprises:- (a) storing the nitrogen oxides in the exhaust gas on a storage catalyst and the sulfur oxides on the sulfur trap at air factors of above 1 and exhaust gas temperatures TK within the activity window DELTA TNOX, in which the exhaust gas temperature TS is smaller than the desulfurization temperature TS DeSOx, and cyclically reducing the air factor of the exhaust gas below 1 to release the stored nitrogen oxides; and (b) desulfurizing the sulfur trap by increasing the exhaust gas temperature TS above the desulfurization temperature of the sulfur trap and reducing the air factor of the exhaust gas below 1 and cyclically repeating steps (a) and (b).

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