ZA200601637B - Multi-metal oxide containing silver, vanadium and a promoter metal and use thereof - Google Patents

Multi-metal oxide containing silver, vanadium and a promoter metal and use thereof Download PDF

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Publication number
ZA200601637B
ZA200601637B ZA200601637A ZA200601637A ZA200601637B ZA 200601637 B ZA200601637 B ZA 200601637B ZA 200601637 A ZA200601637 A ZA 200601637A ZA 200601637 A ZA200601637 A ZA 200601637A ZA 200601637 B ZA200601637 B ZA 200601637B
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ZA
South Africa
Prior art keywords
catalyst
oxide
weight
vanadium
precatalyst
Prior art date
Application number
ZA200601637A
Other languages
English (en)
Inventor
Neto Samuel
Hibst Hartmut
Rosowski Frank
Storck Sebastian
Original Assignee
Basf Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Basf Ag filed Critical Basf Ag
Publication of ZA200601637B publication Critical patent/ZA200601637B/en

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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07FACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F19/00Metal compounds according to more than one of main groups C07F1/00 - C07F17/00
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/16Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
    • C07C51/31Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation of cyclic compounds with ring-splitting
    • C07C51/313Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation of cyclic compounds with ring-splitting with molecular oxygen
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/002Mixed oxides other than spinels, e.g. perovskite
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/54Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/66Silver or gold
    • B01J23/68Silver or gold with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/682Silver or gold with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium with vanadium, niobium, tantalum or polonium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/54Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/66Silver or gold
    • B01J23/68Silver or gold with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/688Silver or gold with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium with manganese, technetium or rhenium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00Catalysts, in general, characterised by their form or physical properties
    • B01J35/30Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01GCOMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G31/00Compounds of vanadium
    • C01G31/006Compounds containing, besides vanadium, two or more other elements, with the exception of oxygen or hydrogen
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/16Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
    • C07C51/21Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen
    • C07C51/255Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting
    • C07C51/265Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting having alkyl side chains which are oxidised to carboxyl groups
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07FACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F1/00Compounds containing elements of Groups 1 or 11 of the Periodic Table
    • C07F1/10Silver compounds
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07FACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F5/00Compounds containing elements of Groups 3 or 13 of the Periodic Table
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07FACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F9/00Compounds containing elements of Groups 5 or 15 of the Periodic Table
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2523/00Constitutive chemical elements of heterogeneous catalysts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00Catalysts, in general, characterised by their form or physical properties
    • B01J35/60Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J35/61Surface area
    • B01J35/61310-100 m2/g
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00Catalysts, in general, characterised by their form or physical properties
    • B01J35/60Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J35/61Surface area
    • B01J35/615100-500 m2/g
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/0009Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
    • B01J37/0027Powdering
    • B01J37/0045Drying a slurry, e.g. spray drying
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02Impregnation, coating or precipitation
    • B01J37/0215Coating
    • B01J37/0221Coating of particles
    • B01J37/0223Coating of particles by rotation

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Inorganic Chemistry (AREA)
  • Catalysts (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Furan Compounds (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
ZA200601637A 2003-07-25 2006-02-24 Multi-metal oxide containing silver, vanadium and a promoter metal and use thereof ZA200601637B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE10334132A DE10334132A1 (de) 2003-07-25 2003-07-25 Silber, Vanadium und ein Promotormetall enthaltendes Multimetalloxid und dessen Verwendung

Publications (1)

Publication Number Publication Date
ZA200601637B true ZA200601637B (en) 2007-04-25

Family

ID=34111681

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA200601637A ZA200601637B (en) 2003-07-25 2006-02-24 Multi-metal oxide containing silver, vanadium and a promoter metal and use thereof

Country Status (14)

Country Link
US (1) US7462727B2 (ja)
EP (1) EP1654211B1 (ja)
JP (1) JP4330626B2 (ja)
KR (1) KR20060066068A (ja)
CN (1) CN1829678B (ja)
BR (1) BRPI0412840A (ja)
DE (1) DE10334132A1 (ja)
IL (1) IL173063A0 (ja)
IN (1) IN2006CH00292A (ja)
MX (1) MXPA06000687A (ja)
RU (1) RU2006105703A (ja)
TW (1) TW200514750A (ja)
WO (1) WO2005012216A1 (ja)
ZA (1) ZA200601637B (ja)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10334132A1 (de) 2003-07-25 2005-04-07 Basf Ag Silber, Vanadium und ein Promotormetall enthaltendes Multimetalloxid und dessen Verwendung
DE102004014918A1 (de) * 2004-03-26 2005-10-13 Basf Ag Katalysator mit einer Silber-Vanadiumoxidphase und einer Promotorphase
DE102004028930A1 (de) * 2004-06-15 2006-01-05 Basf Ag Silber, Vanadium und ein Element der Phosphorgruppe enthaltendes Multimetalloxid und dessen Verwendung
KR100714606B1 (ko) * 2005-02-25 2007-05-07 주식회사 엘지화학 불포화 알데히드 및/또는 불포화 산의 제조방법
DE102005061382A1 (de) * 2005-12-21 2007-06-28 Basf Ag Umwandlung eines Präkatalysators in eine katalytisch aktive Silber-Vanadiumoxid-Bronze
DE502007006673D1 (de) 2006-05-19 2011-04-21 Basf Se Herstellung von phthalsäureanhydrid durch gasphasenoxidation von o-xylol
EP2027102B1 (de) 2006-05-19 2010-04-21 Basf Se Herstellung von phthalsäureanhydrid durch gasphasenoxidation von o-xylol in einem haupt- und nachreaktor
DE102008011011A1 (de) * 2008-02-01 2009-08-06 Breimair, Josef, Dr. Katalysator für die katalytische Gasphasenoxidation von aromatischen Kohlenwasserstoffen zu Aldehyden, Carbonsäuren und/oder Carbonsäureanhydriden, insbesondere zu Phthalsäureanhydrid
US20110028740A1 (en) * 2008-04-07 2011-02-03 Basf Se Method for starting a gas phase oxidation reactor that contains a catalytically active silver-vanadium oxide bronze
FR2939328A3 (fr) * 2008-12-09 2010-06-11 Renault Sas Materiau catalytique de combustion de matiere carbonee
US8187705B2 (en) * 2010-07-15 2012-05-29 Silberline Manufacturing Company, Inc. Manganese vanadium tantalum oxide and pigments having a black metallic effect coated with the same
WO2016100967A1 (en) * 2014-12-19 2016-06-23 Dimien Llc Vanadium oxide compositions and systems and methods for creating them
CN107497445A (zh) * 2015-07-31 2017-12-22 烟台智本知识产权运营管理有限公司 一种甲苯氧化催化剂及其制备方法
CN106552622B (zh) * 2015-09-28 2019-12-17 中国石化扬子石油化工有限公司 一种V-Ag-Si-O催化剂、其制备方法及其应用
CN108722397B (zh) * 2018-06-05 2021-11-26 青岛科技大学 一种高尔夫球状Ag/TiO2复合多孔微球及其制备方法
CN109046412B (zh) * 2018-08-23 2021-05-25 常州新日催化剂股份有限公司 一种正丁烷氧化制顺酐催化剂及其制备方法
EP3846935A1 (en) * 2018-09-05 2021-07-14 SABIC Global Technologies B.V. Vanadium oxide supported catalyst for alkane dehydrogenation
CN112221496B (zh) * 2020-10-13 2022-11-04 天津大学 多元金属氧化物基柴油机氧化催化器用催化剂及制备方法

Family Cites Families (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1280756B (de) 1965-06-14 1968-10-17 Glatt Werner Wirbelbettwanne zur Behandlung, z. B. Trocknen, koernigen Gutes
DE1692938A1 (de) 1966-03-05 1972-03-16 Reemtsma H F & Ph Verfahren zur Beeinflussung der geschmacklichen Eigenschaften des Tabakrauches
DE1769998B2 (de) 1968-08-20 1977-01-27 Basf Ag, 6700 Ludwigshafen Verfahren zur herstellung von phthalsaeureanhydrid
DE2106796C3 (de) 1971-02-12 1981-09-24 Wacker-Chemie GmbH, 8000 München Verfahren zur Herstellung Festbettkatalysatoren mit einem Überzug aus Vanadiumpentoxid und Titandioxid
BE793928A (fr) 1972-01-13 1973-05-02 Deggendorfer Werft Eisenbau Appareil pour la mise en oeuvre de processus chimiques exothermiques et endothermiques
NL7607598A (nl) * 1976-07-09 1978-01-11 Stamicarbon Werkwijze voor de katalytische gasfaseoxidatie van tolueen met een molekulaire zuurstof bevat- tend gas.
AU529228B2 (en) 1977-07-13 1983-06-02 Nippon Shokubai Kagaku Kogyo Co. Ltd. Catalytic vapour phase oxidation
BG40018A1 (en) 1983-07-01 1986-10-15 Nikolov Reactor for carrying out high exothermic and endothermic catalytic processes
US5169820A (en) 1990-03-16 1992-12-08 Nippon Shokubai Kagaku Kogyo Co., Ltd. Catalyst for producing phthalic anhydride
DE4013051A1 (de) 1990-04-24 1991-11-07 Basf Ag Verfahren zur herstellung von phthalsaeureanhydrid aus o-xylol
US5235071A (en) 1991-07-10 1993-08-10 Nippon Shokubai Co., Ltd. Catalyst for producing phthalic anhydride and process by using the same
DE19519172A1 (de) 1995-05-24 1996-11-28 Consortium Elektrochem Ind Trägerkatalysator für Gasphasenoxidationsreaktoren
DE19705326A1 (de) * 1997-02-12 1998-08-13 Basf Ag Verfahren zur selektiven Oxidation von nicht-cyclischen ungesättigten Kohlenwasserstoffen mittels Katalysatoren auf Basis von Silben-Vanadium-Mischoxiden
US6225007B1 (en) * 1999-02-05 2001-05-01 Nanogram Corporation Medal vanadium oxide particles
DE19823262A1 (de) 1998-05-26 1999-12-02 Basf Ag Verfahren zur Herstellung von Phthalsäureanhydrid
DE19851786A1 (de) * 1998-11-10 2000-05-11 Basf Ag Silber- und Vanadiumoxid enthaltendes Multimetalloxid und dessen Verwendung
DE10022103A1 (de) * 2000-05-08 2001-11-15 Basf Ag Silber, Vanadium und ein oder mehrere Elemente der Phosphorgruppe enthaltendes Multimetalloxid und dessen Verwendung
US6919472B2 (en) * 2001-12-21 2005-07-19 Saudi Basic Industries Corporation Catalyst compositions for the selective conversion of alkanes to unsaturated carboxylic acids, methods of making and methods of using thereof
EP1378289A3 (en) * 2002-04-18 2004-02-04 Ford Global Technologies, LLC, A subsidary of Ford Motor Company Platinum-group-metal free catalytic washcoats for particulate exhaust gas filter applications
DE10323817A1 (de) 2003-05-23 2004-12-09 Basf Ag Verfahren zur Herstellung von Phthalsäureanhydrid
DE10323818A1 (de) 2003-05-23 2004-12-09 Basf Ag Katalysatorsysteme zur Herstellung von Phthalsäureanhydrid
DE10323461A1 (de) 2003-05-23 2004-12-09 Basf Ag Herstellung von Aldehyden, Carbonsäuren und/oder Carbonsäureanhydriden mittels Vanadiumoxid, Titandioxid und Antimonoxid enthaltender Katalysatoren
DE10334132A1 (de) 2003-07-25 2005-04-07 Basf Ag Silber, Vanadium und ein Promotormetall enthaltendes Multimetalloxid und dessen Verwendung
DE10335346A1 (de) 2003-08-01 2005-02-24 Basf Ag Katalysator für Gasphasenoxidationen
DE102004014918A1 (de) 2004-03-26 2005-10-13 Basf Ag Katalysator mit einer Silber-Vanadiumoxidphase und einer Promotorphase
DE102004028930A1 (de) 2004-06-15 2006-01-05 Basf Ag Silber, Vanadium und ein Element der Phosphorgruppe enthaltendes Multimetalloxid und dessen Verwendung
JP5174462B2 (ja) 2004-11-18 2013-04-03 ビーエーエスエフ ソシエタス・ヨーロピア 触媒を製造するための二酸化チタン混合物の使用
DE102004063218A1 (de) 2004-12-29 2006-02-23 Basf Ag Phosphor-behandelte Multimetalloxidmassen
DE102005004926A1 (de) 2005-02-02 2006-08-03 Basf Ag Katalysatorsystem für katalytische Gasphasenreaktionen mit einer in Flussrichtung des Gases zunehmenden Katalysatoraktivität

Also Published As

Publication number Publication date
BRPI0412840A (pt) 2006-09-26
US7462727B2 (en) 2008-12-09
JP4330626B2 (ja) 2009-09-16
IL173063A0 (en) 2006-06-11
CN1829678A (zh) 2006-09-06
MXPA06000687A (es) 2006-04-19
IN2006CH00292A (ja) 2007-07-06
TW200514750A (en) 2005-05-01
KR20060066068A (ko) 2006-06-15
RU2006105703A (ru) 2006-08-27
EP1654211B1 (de) 2013-05-15
US20060247446A1 (en) 2006-11-02
WO2005012216A1 (de) 2005-02-10
DE10334132A1 (de) 2005-04-07
EP1654211A1 (de) 2006-05-10
CN1829678B (zh) 2010-12-15
JP2007533577A (ja) 2007-11-22

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