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    2.
    发明专利
    未知

    公开(公告)号：ES2168636T3

    公开(公告)日：2002-06-16

    申请号：ES97924068

    申请日：1997-05-09

    Applicant: RHODIA CHIMIE SA

    Inventor： AUBERT MARYLINE ,  BIRCHEM THIERRY ,  BLANCHARD GILBERT

    IPC: B01D53/86 ,  B01D53/94 ,  B01J23/10 ,  F01N3/10 ,  B01J35/00 ,  B01J35/10 ,  B01J37/03 ,  C01F17/30 ,  C01G25/00 ,  C07C17/15 ,  F01N3/28

    Abstract: A composition based on cerium oxide and on zirconium oxide and, optionally, on a yttrium, scandium or rare-earth metal oxide. The cerium/zirconium atomic proportion is at least 1. The compound exhibits a specific surface, after calcination for 6 hours at 900° C. of at least 35 m2/g and an oxygen storage capacity at 400° C. of at least 1.5 ml of O2/g. The composition is prepared by mixing, in a liquid medium, a cerium compound, a zirconium compound and, if appropriate, a yttrium, scandium or rare-earth metal compound; heating and calcining the precipitate obtained; and using a zirconium solution having an amount of base necessary to reach the equivalent point during an acid/base titration of the solution having a molar ratio of OH-/Zr

    6.
    发明专利
    未知

    公开(公告)号：FR2757425B3

    公开(公告)日：1999-03-19

    申请号：FR9615836

    申请日：1996-12-23

    Applicant: RHODIA CHIMIE SA

    Inventor： BLANCHARD GILBERT ,  VISCIGLIO VALERIE

    IPC: B01D53/86 ,  B01D53/94 ,  B01J23/10 ,  B01J35/10 ,  B01J21/06

    Abstract: The present invention relates to a process for the treatment of exhaust gases from internal combustion engines operating with a fuel containing sulphur. This process is characterized in that use is made, as catalyst, of a composition based on a cerium oxide and on a zirconium oxide, in a cerium/zirconium atomic proportion of at least 1, and on at least one oxide chosen from yttrium, lanthanum and praseodymium oxide and which exhibits a specific surface, after calcination for 6 hours at 900 ° C., of at least 35 m2/g.

    7.
    发明专利
    未知

    公开(公告)号：FR2756819B1

    公开(公告)日：1999-02-19

    申请号：FR9615000

    申请日：1996-12-06

    Applicant: RHODIA CHIMIE SA

    Inventor： BLANCHARD GILBERT ,  QUEMERE ERIC

    IPC: B01J23/10 ,  C01F17/00 ,  C01G25/00 ,  C01G25/02 ,  B01J21/06 ,  B01J21/02 ,  B01J21/10 ,  B01J23/16 ,  B01J23/08 ,  B01J23/74 ,  B01J23/14 ,  B01J35/00

    Abstract: The invention concerns a composition with base of cerium oxide or cerium and zirconium oxide, in extruded form, its method of preparation and its use as catalyst. The method of preparation of this composition is characterised in that it consists in extruding a hydroxide or an oxygen hydroxide of cerium or hydroxides or oxygen hydroxides of cerium and zirconium. The composition can be used as catalyst or catalyst support, particularly in the treatment of exhaust gases of internal combustion engines, in the process of dehydrogenation of ethyl benzene into styrene, in methanation catalysis, in the treatment of a solution or suspension of organic compounds by wet oxidation.

    9.
    发明专利
    未知

    公开(公告)号：ES2188767T3

    公开(公告)日：2003-07-01

    申请号：ES96924030

    申请日：1996-06-28

    Applicant: RHODIA CHIMIE SA

    Inventor： AUBERT MARYLINE ,  BIRCHEM THIERRY ,  BLANCHARD GILBERT ,  TOURET OLIVIER

    IPC: B01D53/94 ,  B01J23/10 ,  B01J35/10 ,  B01J37/03 ,  B01J37/04 ,  C01G25/00 ,  C01G25/02

    Abstract: The invention relates to a composition based on zirconium oxide and comprising cerium oxide which has a specific surface of at least 30 m2/g after calcination for 6 hours at 900° C. and which is provided in the form of a pure solid solution of cerium oxide in zirconium oxide. According to another embodiment, this composition can additionally comprise a doping element and can exhibit a specific surface of at least 25 m2g after calcination for 6 hours at 1000° C. A process for the preparation of these compositions comprises the following stages:a mixture is prepared, in liquid medium, containing a zirconium compound and a cerium(IV) compound;the said mixture is heated at a temperature greater than 100° C.;the reaction mixture obtained on conclusion of the heating is brought to a basic pH;the precipitate thus obtained is recovered;the said precipitate is calcined;the doping element being, if appropriate, added either to the starting mixture in liquid medium or to the reaction mixture obtained on conclusion of the heating.

    10.
    发明专利
    未知

    公开(公告)号：AT212322T

    公开(公告)日：2002-02-15

    申请号：AT97924068

    申请日：1997-05-09

    Applicant: RHODIA CHIMIE SA

    Inventor： AUBERT MARYLINE ,  BIRCHEM THIERRY ,  BLANCHARD GILBERT

    IPC: F01N3/10 ,  B01D53/86 ,  B01D53/94 ,  B01J23/10 ,  B01J35/00 ,  B01J35/10 ,  B01J37/03 ,  C01F17/30 ,  C01G25/00 ,  C07C17/15 ,  F01N3/28

    Abstract: A composition based on cerium oxide and on zirconium oxide and, optionally, on a yttrium, scandium or rare-earth metal oxide. The cerium/zirconium atomic proportion is at least 1. The compound exhibits a specific surface, after calcination for 6 hours at 900° C. of at least 35 m2/g and an oxygen storage capacity at 400° C. of at least 1.5 ml of O2/g. The composition is prepared by mixing, in a liquid medium, a cerium compound, a zirconium compound and, if appropriate, a yttrium, scandium or rare-earth metal compound; heating and calcining the precipitate obtained; and using a zirconium solution having an amount of base necessary to reach the equivalent point during an acid/base titration of the solution having a molar ratio of OH-/Zr

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