WO2006067130A1 - Titanium-zirconium mixed oxide powder - Google Patents

Titanium-zirconium mixed oxide powder Download PDF

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Publication number
WO2006067130A1
WO2006067130A1 PCT/EP2005/056939 EP2005056939W WO2006067130A1 WO 2006067130 A1 WO2006067130 A1 WO 2006067130A1 EP 2005056939 W EP2005056939 W EP 2005056939W WO 2006067130 A1 WO2006067130 A1 WO 2006067130A1
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Prior art keywords
titanium
zirconium
mixed oxide
oxide powder
dioxide
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French (fr)
Inventor
Kai Schumacher
Oswin Klotz
Uwe Diener
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Evonik Operations GmbH
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Degussa GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
    • B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
    • B01J21/066—Zirconium or hafnium; Oxides or hydroxides thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
    • B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
    • B01J21/063—Titanium; Oxides or hydroxides thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02—Impregnation, coating or precipitation
    • B01J37/03—Precipitation; Co-precipitation
    • B01J37/031—Precipitation
    • B01J37/033—Using Hydrolysis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/34—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G23/00—Compounds of titanium
    • C01G23/003—Titanates
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G23/00—Compounds of titanium
    • C01G23/04—Oxides; Hydroxides
    • C01G23/047—Titanium dioxide
    • C01G23/07—Producing by vapour phase processes, e.g. halide oxidation
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G23/00—Compounds of titanium
    • C01G23/04—Oxides; Hydroxides
    • C01G23/047—Titanium dioxide
    • C01G23/07—Producing by vapour phase processes, e.g. halide oxidation
    • C01G23/075—Evacuation and cooling of the gaseous suspension containing the oxide; Desacidification and elimination of gases occluded in the separated oxide
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G25/00—Compounds of zirconium
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00—Crystal-structural characteristics
    • C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
    • C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00—Crystal-structural characteristics
    • C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
    • C01P2002/74—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by peak-intensities or a ratio thereof only
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/12—Surface area

Definitions

  • the invention relates to a titanium-zirconium mixed oxide powder, to its preparation and to its use .
  • DE-A-3611449 discloses a titanium-zirconium mixed oxide powder which comprises at least 5 wt . % of a mixed oxide component .
  • the mixed oxide powder is obtained by a process of flame hydrolysis , in which anhydrous zirconium tetrachloride is transported by means of an inert gas into a mixing chamber and is there mixed with hydrogen, air and titanium tetrachloride, and the mixture is burnt in a reaction chamber .
  • the mixed oxide powder so prepared exhibits reflections of zirconium dioxide, titanium dioxide and zirconium titanate phases in X-ray diffraction analysis .
  • the mixed oxide powder can be used as a catalyst support .
  • the obj ect of the invention is to provide a titanium- zirconium mixed oxide powder which exhibits properties that are at least equally as good as those of catalyst supports described in the prior art, but which has a lower content of the expensive zirconium dioxide component .
  • the invention provides a titanium-zirconium mixed oxide powder in the form of aggregated primary particles , which powder has a content of titanium dioxide of at least 95 wt . % and a content of zirconium dioxide of not more than 5 wt . %, and the sum of the contents of titanium dioxide and zirconium dioxide is at least 99.7 wt . %, in each case based on the total amount of powder, and which exhibits only- reflections of titanium dioxide in the X-ray diffraction diagram.
  • the titanium-zirconium mixed oxide powder according to the invention is in the form of aggregates of primary particles .
  • the primary particles are not porous .
  • the surfaces of these primary particles have hydroxyl groups .
  • Mixed oxide powder is to be understood as meaning a powder in which intimate mixing of zirconium dioxide and titanium dioxide at primary particle or aggregate level is to be understood.
  • the primary particles exhibit Zr-O-Ti bonds .
  • areas of zirconium dioxide can also be present in the primary particles in addition to titanium dioxide . In the case of very high contents of titanium dioxide, individual primary particles can even consist completely of titanium dioxide .
  • the sum of the contents of titanium dioxide and zirconium dioxide in the titanium-zirconium mixed oxide powder according to the invention is at least 99.7 wt . % .
  • the powder can comprise up to 0.3 wt . % impurities .
  • the content of impurities is less than 0.1 wt . %, and the sum of the contents of titanium dioxide and zirconium dioxide is accordingly at least 99.9 wt . % .
  • the impurities can result from the materials that are used or from the preparation process . Chloride is generally the main impurity .
  • the titanium-zirconium mixed oxide powder according to the invention exhibits only the reflections of titanium dioxide, in particular the rutile and anatase modification, in the X-ray diffraction diagram. No reflections of zirconium dioxide or zirconium titanate phases are detected.
  • the rutile content of the titanium-zirconium mixed oxide powder according to the invention is not limited. Preference is given to a content of at least 10 wt . %, particularly preferably to a content of at least 20 wt . %, based on the amount of titanium dioxide .
  • the BET surface area, determined in accordance with DIN 66131 , of the titanium-zirconium mixed oxide powder according to the invention is not limited.
  • the BET surface area can preferably be from 10 to 200 m 2 /g and particularly preferably from 40 to 120 m 2 /g .
  • the invention further provides a process for the preparation of the titanium-zirconium mixed oxide powder according to the invention, in which
  • a titanium compound in vapour form is transported by means of primary air into a mixing chamber, wherein the primary air, which can optionally be enriched with oxygen and/or preheated, is supplied in such an amount that at least 50 % of the titanium and zirconium compounds can be converted into the oxides thereby, corresponding to a lambda(pr) value of at least 0.5, and a zirconium compound in vapour form is likewise transported into the mixing chamber, by means of an inert carrier gas , wherein the amounts of the titanium compound and of the zirconium compound that are used are so chosen that the mixed oxide powder has a content of titanium dioxide of at least 95 wt . % and a content of zirconium dioxide of not more than 5 wt .
  • hydrogen is introduced into the mixing chamber separately from the titanium compound and the zirconium compound, and the mixture of titanium compound, zirconium compound, hydrogen and primary air is ignited in a burner and the flame burns into a reaction chamber, the solid is then separated from gaseous substances , and - the solid is then freed of chloride to the greatest possible extent by treatment with steam at temperatures of from 250 to 700°C, wherein, in the case where lambda( pr ) is less than 1.0 , an amount of secondary air is added to the reaction chamber to give a value of lambda( pr+ sec) of at least 1.0 , and wherein gamma is > 1.
  • An important feature of the process according to the invention is that the titanium compound and at least 50 % of the air that is necessary stoichiometrically in order to convert the titanium compound and the zirconium compound into the mixed oxide powder according to the invention are transported into the mixing chamber together .
  • a further important feature is that the zirconium compound is transported into the mixing chamber by means of an inert gas .
  • the gamma value is > 1 , preferably from 1 to 4.
  • Different gamma values permit the preparation of mixed oxide powders according to the invention having (approximately) the same BET surface area and a variable rutile content .
  • a higher rutile content can be obtained by means of a higher gamma value .
  • Figure 1 shows the process according to the invention in diagrammatic form.
  • a titanium compound in vapour form
  • ai primary air
  • b zirconium compound in vapour form
  • bi inert gas
  • c hydrogen
  • d secondary- air
  • I mixing chamber
  • II reaction chamber .
  • the metal compounds in vapour form are converted into the corresponding metal oxide either by hydrolysis or by oxidation .
  • Hydrolysis can be illustrated with reference to the compounds titanium tetrachloride and zirconium tetrachloride, which are preferably used, as follows , the water originating from the reaction of the (atmospheric) oxygen with hydrogen :
  • Lambda includes the total amount of oxygen introduced from the primary air and the secondary- air .
  • the process according to the invention can preferably be carried out in such a manner that lambda( pr ) is from 0.7 to 4.
  • secondary air can be introduced into the reaction chamber regardless of whether lambda( pr ) is less than 1.
  • lambda ⁇ pr + seC ) is from > 1 to 7.
  • the invention relates also to the use of the titanium- zirconium mixed oxide powder as a catalyst support .
  • Examples 2 to 9 are carried out analogously to Example 1.
  • the amounts of the substances used and the physico-chemical values of the powders in each case are shown in Table 1.
  • the powders of Examples 1 to 9 exhibit only the reflections of titanium dioxide modifications in the X-ray diffraction diagram.
  • Examples 6 to 8 show that it is possible to obtain mixed oxide powders of approximately equal BET surface area having rutile contents of from 27 % to 42 % .
  • Example 10 Tests with a lambda( pr ) value of less than 0.5 generally result in explosion . A powder according to the invention cannot be obtained.
  • Example 11 analogous to Example 1 but, instead of titanium tetrachloride, zirconium tetrachloride in vapour form is transported into the mixing chamber by means of primary air . A product according to the invention is not obtained. The mixed oxide components in this powder are not distributed uniformly . In addition, the powder has only low sintering stability .
  • Table 2 shows the behaviour of the BET surface area of the powders according to the invention of Examples 4 , 7 and 8 compared with Aeroxide® TiO 2 P 25, BET surface area 45 m 2 /g (Degussa) and a zirconium dioxide sample (VP ZrO 2 , BET surface area 52 m 2 /g) , on thermal loading .

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
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Abstract

Titanium-zirconium mixed oxide powder in the form of aggregated primary particles, which powder has a content of titanium dioxide of at least 95 wt.% and a content of zirconium dioxide of not more than 5 wt.%, and the sum of the contents of titanium dioxide and zirconium dioxide is at least 99.7 wt.%, in each case based on the total amount of powder, and which exhibits only reflections of titanium dioxide in the X-ray diffraction diagram. It is prepared by transporting into a mixing chamber a titanium compound in vapour form by means of primary air and a zirconium compound in vapour form by means of an inert gas, mixing the mixture with hydrogen in a mixing chamber burning into a reaction chamber. It can be used as a catalyst support.

Description

Titanium-zirconium mixed oxide powder
The invention relates to a titanium-zirconium mixed oxide powder, to its preparation and to its use .
DE-A-3611449 discloses a titanium-zirconium mixed oxide powder which comprises at least 5 wt . % of a mixed oxide component . The mixed oxide powder is obtained by a process of flame hydrolysis , in which anhydrous zirconium tetrachloride is transported by means of an inert gas into a mixing chamber and is there mixed with hydrogen, air and titanium tetrachloride, and the mixture is burnt in a reaction chamber . The mixed oxide powder so prepared exhibits reflections of zirconium dioxide, titanium dioxide and zirconium titanate phases in X-ray diffraction analysis . The mixed oxide powder can be used as a catalyst support .
The obj ect of the invention is to provide a titanium- zirconium mixed oxide powder which exhibits properties that are at least equally as good as those of catalyst supports described in the prior art, but which has a lower content of the expensive zirconium dioxide component .
The invention provides a titanium-zirconium mixed oxide powder in the form of aggregated primary particles , which powder has a content of titanium dioxide of at least 95 wt . % and a content of zirconium dioxide of not more than 5 wt . %, and the sum of the contents of titanium dioxide and zirconium dioxide is at least 99.7 wt . %, in each case based on the total amount of powder, and which exhibits only- reflections of titanium dioxide in the X-ray diffraction diagram.
The titanium-zirconium mixed oxide powder according to the invention is in the form of aggregates of primary particles . The primary particles are not porous . The surfaces of these primary particles have hydroxyl groups . Mixed oxide powder is to be understood as meaning a powder in which intimate mixing of zirconium dioxide and titanium dioxide at primary particle or aggregate level is to be understood. The primary particles exhibit Zr-O-Ti bonds . In addition, areas of zirconium dioxide can also be present in the primary particles in addition to titanium dioxide . In the case of very high contents of titanium dioxide, individual primary particles can even consist completely of titanium dioxide .
The sum of the contents of titanium dioxide and zirconium dioxide in the titanium-zirconium mixed oxide powder according to the invention is at least 99.7 wt . % . The powder can comprise up to 0.3 wt . % impurities . In general, the content of impurities is less than 0.1 wt . %, and the sum of the contents of titanium dioxide and zirconium dioxide is accordingly at least 99.9 wt . % . The impurities can result from the materials that are used or from the preparation process . Chloride is generally the main impurity .
The titanium-zirconium mixed oxide powder according to the invention exhibits only the reflections of titanium dioxide, in particular the rutile and anatase modification, in the X-ray diffraction diagram. No reflections of zirconium dioxide or zirconium titanate phases are detected.
The rutile content of the titanium-zirconium mixed oxide powder according to the invention is not limited. Preference is given to a content of at least 10 wt . %, particularly preferably to a content of at least 20 wt . %, based on the amount of titanium dioxide .
The BET surface area, determined in accordance with DIN 66131 , of the titanium-zirconium mixed oxide powder according to the invention is not limited. The BET surface area can preferably be from 10 to 200 m2/g and particularly preferably from 40 to 120 m2/g . The invention further provides a process for the preparation of the titanium-zirconium mixed oxide powder according to the invention, in which
a titanium compound in vapour form is transported by means of primary air into a mixing chamber, wherein the primary air, which can optionally be enriched with oxygen and/or preheated, is supplied in such an amount that at least 50 % of the titanium and zirconium compounds can be converted into the oxides thereby, corresponding to a lambda(pr) value of at least 0.5, and a zirconium compound in vapour form is likewise transported into the mixing chamber, by means of an inert carrier gas , wherein the amounts of the titanium compound and of the zirconium compound that are used are so chosen that the mixed oxide powder has a content of titanium dioxide of at least 95 wt . % and a content of zirconium dioxide of not more than 5 wt . %, hydrogen is introduced into the mixing chamber separately from the titanium compound and the zirconium compound, and the mixture of titanium compound, zirconium compound, hydrogen and primary air is ignited in a burner and the flame burns into a reaction chamber, the solid is then separated from gaseous substances , and - the solid is then freed of chloride to the greatest possible extent by treatment with steam at temperatures of from 250 to 700°C, wherein, in the case where lambda(pr) is less than 1.0 , an amount of secondary air is added to the reaction chamber to give a value of lambda(pr+sec) of at least 1.0 , and wherein gamma is > 1.
An important feature of the process according to the invention is that the titanium compound and at least 50 % of the air that is necessary stoichiometrically in order to convert the titanium compound and the zirconium compound into the mixed oxide powder according to the invention are transported into the mixing chamber together .
A further important feature is that the zirconium compound is transported into the mixing chamber by means of an inert gas .
It is also important that, if the air introduced into the mixing chamber is not sufficient to convert the starting compounds completely into the mixed oxide powder according to the invention, secondary air is introduced into the reaction chamber .
It is also important that the gamma value is > 1 , preferably from 1 to 4. Different gamma values permit the preparation of mixed oxide powders according to the invention having (approximately) the same BET surface area and a variable rutile content . A higher rutile content can be obtained by means of a higher gamma value .
Figure 1 shows the process according to the invention in diagrammatic form. In the figure : a = titanium compound in vapour form; ai = primary air; b = zirconium compound in vapour form; bi = inert gas ; c = hydrogen; d = secondary- air; I = mixing chamber; II = reaction chamber .
The metal compounds in vapour form are converted into the corresponding metal oxide either by hydrolysis or by oxidation .
Hydrolysis can be illustrated with reference to the compounds titanium tetrachloride and zirconium tetrachloride, which are preferably used, as follows , the water originating from the reaction of the (atmospheric) oxygen with hydrogen :
TiCl4 + 2H2O -> TiO2 + 4HCl; ZrCl4 + 2H2O -> ZrO2 + 4HCl Gamma and lambda are defined as follows : gamma = H2 supplied / H2 required stoichiometrically, lambda = O2 supplied / O2 required stoichiometrically .
Lambda includes the total amount of oxygen introduced from the primary air and the secondary- air .
The process according to the invention can preferably be carried out in such a manner that lambda(pr) is from 0.7 to 4.
In the process according to the invention, secondary air can be introduced into the reaction chamber regardless of whether lambda(pr) is less than 1. Preferably, lambda<pr + seC) is from > 1 to 7.
The invention relates also to the use of the titanium- zirconium mixed oxide powder as a catalyst support .
Examples :
Example 1 :
4300 g/h of TiCl4 are vaporised. The vapours are transported into a mixing chamber by means of primary air (14.8 Nm3/h) . Separately therefrom, 24 g/h of ZrCl4 are vaporised and are likewise transported into the mixing chamber, by means of nitrogen . Separately from the titanium tetrachloride and the zirconium tetrachloride, 2.20 Nm3/h of hydrogen are introduced into the mixing chamber . In a central pipe, the reaction mixture is fed to a burner and ignited. The flame thereby burns into a water-cooled reaction chamber . 17 Nm3/h of secondary air are additionally introduced into the reaction chamber . The powder that forms is separated off in a downstream filter and then treated countercurrently with air and steam at about 700°C .
Examples 2 to 9 are carried out analogously to Example 1. The amounts of the substances used and the physico-chemical values of the powders in each case are shown in Table 1.
The powders of Examples 1 to 9 exhibit only the reflections of titanium dioxide modifications in the X-ray diffraction diagram.
Examples 6 to 8 show that it is possible to obtain mixed oxide powders of approximately equal BET surface area having rutile contents of from 27 % to 42 % .
Example 10 : Tests with a lambda(pr) value of less than 0.5 generally result in explosion . A powder according to the invention cannot be obtained.
Example 11 : analogous to Example 1 but, instead of titanium tetrachloride, zirconium tetrachloride in vapour form is transported into the mixing chamber by means of primary air . A product according to the invention is not obtained. The mixed oxide components in this powder are not distributed uniformly . In addition, the powder has only low sintering stability .
Table 2 shows the behaviour of the BET surface area of the powders according to the invention of Examples 4 , 7 and 8 compared with Aeroxide® TiO2 P 25, BET surface area 45 m2/g (Degussa) and a zirconium dioxide sample (VP ZrO2, BET surface area 52 m2/g) , on thermal loading .
The Examples show that even a powder according to the invention having a very low zirconium dioxide content results in a high stability of the BET surface area on thermal loading .
Table 1 : Substances and amounts used; physico-chemical parameters of the resulting powders
Figure imgf000010_0001
Table 2 : Stability of the BET surface area on thermal treatment
Figure imgf000011_0001

Claims

Patent claims :
1. Titanium-zirconium mixed oxide powder in the form of aggregated primary particles , characterised in that
it has a content of titanium dioxide of at least 95 wt . % and a content of zirconium dioxide of not more than 5 wt . %, and the sum of the contents of titanium dioxide and zirconium dioxide is at least 99.7 wt . %, in each case based on the total amount of powder, and
it exhibits only reflections of titanium dioxide in the X-ray diffraction diagram.
2. Titanium-zirconium mixed oxide powder according to claim 1 , characterised in that the rutile content is at least 10 wt . %, based on the sum of rutile and anatase .
3. Titanium-zirconium mixed oxide powder according to claim 1 or 2 , characterised in that the BET surface area is from 10 to 200 m2/g .
4. Process for the preparation of the titanium-zirconium mixed oxide powder according to claims 1 to 3, characterised in that - a titanium compound in vapour form is transported by means of primary air into a mixing chamber, wherein the primary air, which can optionally be enriched with oxygen and/or preheated, is supplied in such an amount that at least 50 % of the titanium and zirconium compounds can be converted into the oxides thereby, corresponding to a lambda(pr> value of at least 0.5, and a zirconium compound in vapour form is likewise transported into the mixing chamber, by means of an inert carrier gas , - wherein the amounts of the titanium compound and of the zirconium compound that are used are so chosen that the mixed oxide powder has a content of titanium dioxide of at least 95 wt . % and a content of zirconium dioxide of not more than 5 wt . %, hydrogen is introduced into the mixing chamber separately from the titanium compound and the zirconium compound, and the mixture of titanium compound, zirconium compound, hydrogen and primary air is ignited in a burner and the flame burns into a reaction chamber, the solid is then separated from gaseous substances , and the solid is then freed of chloride to the greatest possible extent by treatment with steam at temperatures of from 250 to 700°C,
- wherein, in the case where lambda(pr) is less than 1.0 , an amount of secondary air is added to the reaction chamber to give a value of lambda(pr+sec) of at least 1.0 , and
- wherein gamma is > 1.
5. Process for the preparation of the titanium-zirconium mixed oxide powder according to claim 4 , characterised in that lambda(pr) is from 0.7 to 4.
6. Process for the preparation of the titanium-zirconium mixed oxide powder according to claim 4 or 5, characterised in that lambda(pr + seC) is from > 1 to 7.
7. Use of the titanium-zirconium mixed oxide powder according to claims 1 to 3 as a catalyst support .
PCT/EP2005/056939 2004-12-22 2005-12-20 Titanium-zirconium mixed oxide powder Ceased WO2006067130A1 (en)

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DE200410061703 DE102004061703A1 (en) 2004-12-22 2004-12-22 Titanium-aluminum mixed oxide powder

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0241647A2 (en) * 1986-04-05 1987-10-21 Degussa Aktiengesellschaft Basic products for the manufacture of ceramic materials
US5684116A (en) * 1994-01-07 1997-11-04 Akzo Nobel, N.V. Titanium dioxide/silicon dioxide coprecipitates and titanium dioxide/zirconium dioxide coprecipitates as polycondensation catalysts for polyesters and copolyesters
EP1138632A1 (en) * 2000-03-29 2001-10-04 Degussa AG Doped titanium dioxide

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0241647A2 (en) * 1986-04-05 1987-10-21 Degussa Aktiengesellschaft Basic products for the manufacture of ceramic materials
US5684116A (en) * 1994-01-07 1997-11-04 Akzo Nobel, N.V. Titanium dioxide/silicon dioxide coprecipitates and titanium dioxide/zirconium dioxide coprecipitates as polycondensation catalysts for polyesters and copolyesters
EP1138632A1 (en) * 2000-03-29 2001-10-04 Degussa AG Doped titanium dioxide

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