Multimetal oxide composition, useful as oxidation catalyst, especially for gas phase production of (meth)acrylic acid, comprises crystallites of constant composition

    公开(公告)号:DE19922113A1

    公开(公告)日:2000-08-10

    申请号:DE19922113

    申请日:1999-05-12

    Applicant: BASF AG

    Abstract: Multimetal oxide composition is a multimetal oxide (I) of molybdenum with vanadium, niobium, tantalum, tungsten and/or rhenium and boron, silicon, phosphorus, germanium, arsenic and/or antimony and optionally other metal(s) in the form of crystallites of constant composition. Multimetal oxide composition is of formula (I); (A)p(B)q (I) Mo12X aX bX cX dX eOx (II) MofX gX hOy (III) A = a multimetal oxide of formula (II); B = a multimetal oxide of formula (III); X = hydrogen, up to 97 mole-% of which may be replaced by ammonium, potassium, rubidium and/or cesium; X = vanadium, niobium (Nb), tantalum (Ta), tungsten and/or rhenium; X = boron, silicon, phosphorus, germanium, arsenic and/or antimony (Sb); X = chromium, manganese, iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), magnesium (Mg), calcium (Ca), strontium (Sr) and/or barium (Ba); X = sulfur; X = Cu, Fe, Co, Ni, Zn, cadmium, Mn, Mg, Ca, Sr and/or Ba; X = Nb, Ta and/or Sb; a = 1-3; b = 0.1-2; c = 0-5; d, e = 0-1; f = 0-2; g = 0.5-1.5; h = 2-4; x, y = values depending on the valency and frequency of elements other than oxygen; p = 1; and q = 0; or p, q not = 0 and p/q = (160-1):1 The standard deviation of the stoichiometric coefficient a of the variable X of individual crystallites of component A is less than 0.40, preferably less than 0.20, especially less than 0.11. An Independent claim is also included for the preparation of multimetal oxide (I).

    Catalyst for gas phase oxidations
    27.
    发明专利

    公开(公告)号:IN411CH2006A

    公开(公告)日:2007-07-06

    申请号:IN411CH2006

    申请日:2006-02-01

    Applicant: BASF AG

    Abstract: A catalyst for gas-phase oxidations which comprises an inert support and a catalytically active composition comprising transition metal oxides applied thereto, or a precatalyst, is described. The (pre)catalyst is obtained by treating the inert support with an aqueous suspension or solution of the transition metal oxides or their precursor compounds, where the suspension contains a binder dispersion and the binder is a copolymer of an alpha-olefin and a vinyl-C 2 -C 4 -carboxylate whose vinyl C 2 -C 4 -carboxylate content is at least 62 mol %.

    29.
    发明专利
    未知

    公开(公告)号:AT360480T

    公开(公告)日:2007-05-15

    申请号:AT04763675

    申请日:2004-07-30

    Applicant: BASF AG

    Abstract: A catalyst for gas-phase oxidations which comprises an inert support and a catalytically active composition comprising transition metal oxides applied thereto, or a precatalyst, is described. The (pre)catalyst is obtained by treating the inert support with an aqueous suspension or solution of the transition metal oxides or their precursor compounds, where the suspension contains a binder dispersion and the binder is a copolymer of an alpha-olefin and a vinyl-C 2 -C 4 -carboxylate whose vinyl C 2 -C 4 -carboxylate content is at least 62 mol %.

    30.
    发明专利
    未知

    公开(公告)号:DE50306580D1

    公开(公告)日:2007-04-05

    申请号:DE50306580

    申请日:2003-02-04

    Applicant: BASF AG

    Abstract: Production of phthalic anhydride by gas-phase oxidation of o-xylene or naphthalene in a tubular reactor involves using three or more different catalyst beds with controlled hot-spot temperatures. A method for the production of phthalic anhydride (I) by gas-phase oxidation of xylene and/or naphthalene in a thermostatted tube-bank reactor on 3 or more solid-bed catalysts in 3 different layers involves carrying out the process in such a way that the peak temperature (T2) in the second catalyst layer (in the direction of flow) is up to 50 degrees C below the peak temperature (T1) in the first layer and the peak temperature (T3) in the third layer is 30-100 degrees C below T1.

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