WO2010068321A1 - Process for producing enhanced alumina - Google Patents
Process for producing enhanced alumina Download PDFInfo
- Publication number
- WO2010068321A1 WO2010068321A1 PCT/US2009/057619 US2009057619W WO2010068321A1 WO 2010068321 A1 WO2010068321 A1 WO 2010068321A1 US 2009057619 W US2009057619 W US 2009057619W WO 2010068321 A1 WO2010068321 A1 WO 2010068321A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- alumina
- ammonium
- mixture
- carbonate
- dawsonite
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/021—After-treatment of oxides or hydroxides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/30—Preparation of aluminium oxide or hydroxide by thermal decomposition or by hydrolysis or oxidation of aluminium compounds
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/78—Compounds containing aluminium and two or more other elements, with the exception of oxygen and hydrogen
- C01F7/782—Compounds containing aluminium and two or more other elements, with the exception of oxygen and hydrogen containing carbonate ions, e.g. dawsonite
-
- 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
-
- 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
- C01P2006/14—Pore volume
-
- 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
- C01P2006/32—Thermal properties
- C01P2006/37—Stability against thermal decomposition
Definitions
- Alumina powders are widely used is many areas of industry and life such as for supports of catalysts, adsorbents, additives, in the ceramic industry, fillers and others.
- EA enhanced alumina
- Simple alumina powder manufacturing methods are also needed.
- Dawsonite sodium aluminum dihydroxide carbonate (NaAlOH ⁇ CO ⁇ ) and its alkali metal and ammonium analogs are useful compounds that either occur naturally or are synthesized by a variety of processes which in the prior art have taken place in aqueous medium.
- dawsonite was produced by combination of aluminum hydroxide and an alkali metal or ammonium hydrogencarbonate at high pressure and at temperatures between 150° and 250 0 C.
- This invention provides an essentially dry method for preparation of enhanced alumina powders. It includes three important steps.
- the first step involves rapid (flash) calcination of an aluminum compound, usually a hydroxide and typically A1(OH)3 (gibbsite) as conventionally produced in the Bayer process.
- This step is practiced industrially for manufacturing activated alumina particulates and special powders capable of rehydration.
- Alumina powder produced in the first step is mixed with solid ammonium carbonate in a blender upon addition of a small amount of water.
- Ammonium hydrogencarbonate (bicarbonate) NH4HCO3 is the preferred carbonate, but other ammonium carbonates such as (NH4)2 CO3, ammonium sesqui carbonate or carbamate can be also used.
- the mixture heats itself up without addition of external heat, but a moderate heating and curing can be applied to facilitate a reaction that results in the preparation of ammonium aluminum hydroxycarbonate (dawsonite-type) NH4A1CO3(OH)2.
- the third step involves the decomposition of ammonium aluminum hydroxycarbonate to obtain enhanced alumina (EA) with specific morphology and the features of a nano-sized material.
- EA enhanced alumina
- Carbon dioxide (CO2 and ammonia (NH3) and water are gaseous decomposition products of hydroxycarbonate as well [0005]
- Carbon dioxide and ammonia can be recovered and reused for the preparation of ammonium bicarbonate that is used as a raw material.
- the invention differs from the known methods for alumina powder production such as hydrolysis of aluminum alkoxides and different precipitation routes. It differs also from the methods that employ rehydration of flash calcined alumina (FCA) that usually are followed by autoclaving and thermal treatment. No significant liquids or emissions are involved.
- FCA flash calcined alumina
- the carbonate additive can be used in a dry form and can be easily recovered for re-use by capturing NH3 and CO2 evolved in the decomposition stage.
- FCA alumina powder produced industrially by flash calcination of gibbsite and known as A-300 product of UOP LLC is mixed in a blender with reagent grade ammonium bicarbonate powder upon addition of small amounts of water.
- the mixture is free flowing but it changes somewhat the flow pattern and the resistance to mixing upon water addition.
- the temperature also increases and exceeds 45° to 50 0 C.
- the resulting powder is transferred to a plastic container and additionally cured in an oven at 55° to 6O 0 C to complete the reaction.
- the last step of the process is the thermal decomposition of NH4 - dawsonite producing enhanced alumina with high BET surface area and pore volume.
- the source alumina may undergo a treatment with acid solution followed by washing and drying. The purpose of this treatment being to reduce the residual sodium in the case when the source alumina is derived from the Bayer process of alumina production.
- Such alumina material normally contains 0.2 to 0.5 mass-% sodium expressed as the oxide.
- Low soda alumina is desired when used as catalyst support. Instead on the source alumina, the treatment with the acid solution can be performed directly on the enhanced alumina produced after decomposition of the hydroxycarbonate product.
- the process of producing enhanced alumina through described hydroxycarbonate, (dawsonite-type) intermediate can be combined with the use of additives in order to enhance even further the properties of the final product. Additives in both solid and liquid form can be used. Alumina having increased thermal stability is produced if the water in the hydroxycarbonate formation step is replaced by colloidal silica solution.
- This invention provides an essentially dry method for preparation of enhanced alumina powders. It includes three important steps.
- the first step involves rapid (flash) calcination of an aluminum compound, usually a hydroxide and typically Al(0H)3 (gibbsite) as conventionally produced in the Bayer process.
- This step is practiced industrially for manufacturing activated alumina particulates and special powders capable of rehydration.
- the simplified reaction is shown in reaction (1).
- the alumina produced in the first step is referred to as flash-calcined alumina (FCA).
- aluminas such as these produced by hydrolysis of aluminum alkoxides, precipitation or hydrothermal treatment of alumina sources can be easily used as a raw material for producing enhanced alumina according the invention provided these aluminas have sufficient reactivity towards ammonium carbonate reagent. Generally, having at least 50 m ⁇ /g BET surface area and some rehydratability are important conditions for suitability to serve as alumina raw material.
- Alumina powder produced in the first step is mixed with solid ammonium carbonate in a blender upon addition of a small amount of water.
- Ammonium bicarbonate carbonate NH4HCO3 is the preferred carbonate, but other ammonium carbonates such as
- the reaction (2) can be carried in different extend depending on the needs of obtaining enhanced alumina properties. Both partial and practically full conversion of the source alumina to enhanced alumina can be achieved. Repeating step 2 upon addition of fresh portions of ammonium carbonate speeds up the conversion process of alumina. The use of a small amount, typically from 2 to 10 mass-%, of ammonium aluminum hydroxycarbonate powder in step 2 also facilitates the conversion of the source alumina to hydroxycarbonate [0012]
- the third step involves the decomposition of ammonium dawsonite to obtain enhanced alumina (EA) with specific morphology and the features of a nano-sized material - reaction (3).
- the decomposition step can be carried out in a variety of devices. Preferred are devices that allow for re-use of the decomposition products. Usually, temperatures from 130° to 32O 0 C are sufficient to fully decompose the hydroxycarbonate intermediate while the lower range is especially preferred when step 2 of the process leads to HYCARB formation. Additional heat treatment can be carried out depending on the application needs. Treatment at temperatures of 600 0 C is performed if the final product should have gamma alumina as the mail alumina crystalline phase. [0013] The particle morphology of the final alumina differs significantly from that of the source material. The main difference is the appearance of multitude of rod -like subparticles which arise and are entrenched in the original particle.
- Carbon dioxide and ammonia can be recovered from reaction (3) and reused for the preparation of ammonium bicarbonate that is used as a raw material for reaction (2).
- the invention differs from the known methods for alumina powder production such as hydrolysis of aluminum alkoxides and different precipitation routes. It differs also from the methods that employ rehydration of flash calcined alumina (FCA) followed usually by combination of acid treatment, autoclaving and thermal treatment. No significant liquids or emissions are involved.
- FCA flash calcined alumina
- the carbonate additive can be used in a dry form and can be easily recovered for re-use by capturing NH 3 and CO 2 evolved in the decomposition stage.
- lOOg A-300 alumina is mixed with 15Og solid ammonium carbonate in a blender upon addition of 24.5g water as described above.
- the material was cured overnight at 71 0 C in a sealed container.
- the resulting powder is then calcined at 400 0 C for 1 hour in a muffle oven to produce enhanced alumina with improved thermal stability.
- Comparison A-300 powder has been treated at the equipment described in Example 1. No bicarbonate was added but only 30.4 g deionized water. The sample was then calcined at 400 0 C for 1 hour.
- Example 1 The conditions of Example 1 were applied but the duration of 400 0 C calcination step was 16 hours.
- Example 4 The same condition as Example 4 but the calcination temperature was 800 0 C.
- the calcined samples of Examples 1 to 6 were analyzed using the common method for BET surface area and pore volume determination by low temperature nitrogen adsorption. In addition, selected samples were analyzed for thermal stability using a DTA (differential thermal analyzer), air flow and a temperature programming rate of 5°C/min. The temperature of the specific exothermic effect showing the transition to alpha alumina phase was registered as a measure of thermostability.
- the data obtained are summarized in the Table whereas the sample according Example 3 represents a comparison sample produced without any addition of ammonium carbonate.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011540721A JP5425928B2 (en) | 2008-12-11 | 2009-09-21 | Method for producing reinforced alumina |
CA 2744576 CA2744576C (en) | 2008-12-11 | 2009-09-21 | Process for producing enhanced alumina |
CN200980149231.6A CN102245508B (en) | 2008-12-11 | 2009-09-21 | Process for producing enhanced alumina |
EP09832268.8A EP2358636B1 (en) | 2008-12-11 | 2009-09-21 | Process for producing enhanced alumina |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/332,421 US8007760B2 (en) | 2008-12-11 | 2008-12-11 | Process for producing enhanced alumina |
US12/332,421 | 2008-12-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010068321A1 true WO2010068321A1 (en) | 2010-06-17 |
Family
ID=42240792
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2009/057619 WO2010068321A1 (en) | 2008-12-11 | 2009-09-21 | Process for producing enhanced alumina |
Country Status (6)
Country | Link |
---|---|
US (1) | US8007760B2 (en) |
EP (1) | EP2358636B1 (en) |
JP (1) | JP5425928B2 (en) |
CN (1) | CN102245508B (en) |
CA (1) | CA2744576C (en) |
WO (1) | WO2010068321A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102020302A (en) * | 2010-12-15 | 2011-04-20 | 中国铝业股份有限公司 | Method for reducing content of sodium in aluminum hydroxide |
CN111233017A (en) * | 2019-11-22 | 2020-06-05 | 中国石油大学(华东) | Process for synthesizing monoclinic phase basic ammonium aluminum carbonate and preparing porous alumina by pyrolysis of monoclinic phase basic ammonium aluminum carbonate |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8759241B2 (en) * | 2011-02-25 | 2014-06-24 | General Electric Company | Method for making a catalyst composition |
CN102675926A (en) * | 2012-04-24 | 2012-09-19 | 中国铝业股份有限公司 | Method for raising thermal decomposition temperature of aluminum hydroxide |
CN103785396B (en) * | 2012-11-01 | 2016-05-18 | 中国石油化工股份有限公司 | A kind of preparation method of catalyst for heavy oil hydrogenation demetal |
CN105621462B (en) * | 2014-10-30 | 2017-05-17 | 中国石油化工股份有限公司 | Method for preparing aluminium oxide material |
RU2632437C1 (en) * | 2016-10-21 | 2017-10-04 | Федеральное государственное бюджетное учреждение науки Институт химии и технологии редких элементов и минерального сырья им. И.В. Тананаева Кольского научного центра Российской академии наук (ИХТРЭМС КНЦ РАН) | Method of producng aluminium oxide |
CN106542551B (en) * | 2016-11-24 | 2017-12-01 | 中南大学 | A kind of method of coproduction dawsonite and hydrated calcium silicate from flyash |
EP3565663A4 (en) * | 2017-01-05 | 2020-09-09 | Scientific Design Company, Inc. | Carrier, catalyst, methods for producing them and method for producing ethylene oxide |
RU2677204C1 (en) * | 2018-02-21 | 2019-01-15 | Федеральное государственное бюджетное учреждение науки Федеральный исследовательский центр "Кольский научный центр Российской академии наук" (ФИЦ КНЦ РАН) | Method of processing aluminum alum |
CN108970628B (en) * | 2018-08-08 | 2023-08-29 | 北京众智创新科技开发有限公司 | Preparation method of ebullated bed hydrotreating catalyst |
CN109292802A (en) * | 2018-08-21 | 2019-02-01 | 中国石油大学(华东) | A kind of synthesis aluminum carbonate basic ammonium and its pyrolysis prepare the friendly process of high specific surface aluminium |
CN110935464B (en) * | 2018-09-25 | 2022-07-12 | 中国石油化工股份有限公司 | Preparation method of carbon-containing hydrodemetallization catalyst |
CN111298782B (en) * | 2018-12-12 | 2022-08-12 | 中国石油化工股份有限公司 | Integral honeycomb cordierite carrier and preparation method thereof |
CN111686749B (en) * | 2019-03-13 | 2022-07-12 | 中国石油化工股份有限公司 | Preparation method of hydrogenation catalyst |
CN116081664A (en) * | 2021-10-29 | 2023-05-09 | 中国石油化工股份有限公司 | Macroporous alumina and its production process |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4053579A (en) * | 1975-05-29 | 1977-10-11 | Agency Of Industrial Science & Technology | Method for manufacture of sintered alumina from ammonium aluminum carbonate hydroxide |
US4356157A (en) | 1980-08-14 | 1982-10-26 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Synthesis of dawsonites |
WO1987001365A1 (en) * | 1985-08-27 | 1987-03-12 | Chevron Research Company | Process for producing a high surface area alumina |
US20050201928A1 (en) * | 2004-03-12 | 2005-09-15 | Sumitomo Chemical Company, Limited | Method for producing alpha-alumina particle |
US20060194885A1 (en) * | 1999-12-27 | 2006-08-31 | Showa Denko K.K. | Alumina particles, production process thereof, composition comprising the particles and alumina slurry for polishing |
Family Cites Families (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA863262A (en) | 1971-02-09 | J. Ashton Stanley | Aluminium alloys and articles made therefrom | |
US2783124A (en) | 1955-10-21 | 1957-02-26 | Chattanooga Medicine Co | Method of making dihydroxy aluminum carbonate compounds |
US3459502A (en) | 1967-03-10 | 1969-08-05 | Sinclair Research Inc | Production of alumina from dawsonite |
US3389975A (en) | 1967-03-10 | 1968-06-25 | Sinclair Research Inc | Process for the recovery of aluminum values from retorted shale and conversion of sodium aluminate to sodium aluminum carbonate hydroxide |
US3714343A (en) * | 1967-06-26 | 1973-01-30 | Mitsubishi Chem Ind | Alumina hydrate,theta-alumina and a method for the manufacture thereof |
US3557025A (en) | 1968-05-13 | 1971-01-19 | Kaiser Aluminium Chem Corp | Method of producing alkalized alumina and products produced thereby |
US3629153A (en) | 1969-02-12 | 1971-12-21 | Grace W R & Co | Process for preparing alkalized alumina |
US3623837A (en) | 1969-12-04 | 1971-11-30 | Kaiser Aluminium Chem Corp | Process for producing fine particle size alumina hydrates |
US3739062A (en) | 1970-10-05 | 1973-06-12 | Kaiser Aluminium Chem Corp | Direct conversion of dawsonite to pseudoboehmite |
US3911090A (en) | 1973-05-14 | 1975-10-07 | Purdue Research Foundation | Aluminum hydroxy carbonates nucleated with silicate anion |
US3878166A (en) | 1974-02-11 | 1975-04-15 | Kaiser Aluminium Chem Corp | Flame retardant polymeric compositions |
FR2431993A1 (en) | 1978-07-26 | 1980-02-22 | Rhone Poulenc Ind | NOVEL HIGHLY REACTIVE ALUMIN, PROCESS FOR THE PREPARATION THEREOF AND ITS APPLICATION TO THE PREPARATION OF ALUMINUM HYDROXYCHLORIDE |
US4221771A (en) | 1979-04-23 | 1980-09-09 | J. M. Huber Corporation | Preparation of dawsonite |
US4468375A (en) | 1982-09-27 | 1984-08-28 | Aluminum Company Of America | Production of alumina from aluminum-containing mineral ores with sodium bicarbonate |
JPS6287412A (en) * | 1985-10-14 | 1987-04-21 | Shikoku Chem Corp | Production of high-purity alumina using colloidal earth as raw material |
DE3913243A1 (en) | 1989-04-21 | 1990-10-25 | Univ Karlsruhe | METHOD FOR PRODUCING DAWSONITE |
US5286687A (en) | 1991-08-09 | 1994-02-15 | Agency Of Industrial Science And Technology | Method for production of needlelike crystalline particles |
BR9301438A (en) * | 1993-04-05 | 1994-11-15 | Petroleo Brasileiro Sa | Process of preparation of spherical ziegler catalyst for polymerization of alpha-olefins, spherical catalyst, process of obtaining spherical polyethylene of very high molecular weight and spherical polyethylene of very high by molecular |
KR100439636B1 (en) | 1995-09-01 | 2004-10-26 | 미즈자와 가가꾸 고교오 가부시기가이샤 | Alkali aluminum complex hydroxide carbonate, its preparation method and use |
US6013600A (en) | 1997-05-23 | 2000-01-11 | Laroche Industries Inc. | Alumina bodies containing alkali or alkaline earth metal compounds |
JP2000256011A (en) * | 1999-03-10 | 2000-09-19 | Taimei Chemicals Co Ltd | Boehmite and its production |
TW200422258A (en) | 2003-02-26 | 2004-11-01 | Sumitomo Chemical Co | Method for producing α-alumina powder |
TWI348457B (en) | 2003-03-04 | 2011-09-11 | Sumitomo Chemical Co | Method for producing 帢-alumina particulate |
CN1332762C (en) * | 2004-07-29 | 2007-08-22 | 中国石油化工股份有限公司 | Method for preparing alumina supporter in structure of double peak holes |
US7758837B2 (en) | 2005-05-06 | 2010-07-20 | Uop Llc | Scavengers for removal of acid gases from fluid streams |
US7981836B2 (en) | 2006-05-24 | 2011-07-19 | Uop Llc | Hydrothermally stable alumina |
-
2008
- 2008-12-11 US US12/332,421 patent/US8007760B2/en not_active Expired - Fee Related
-
2009
- 2009-09-21 CA CA 2744576 patent/CA2744576C/en not_active Expired - Fee Related
- 2009-09-21 JP JP2011540721A patent/JP5425928B2/en active Active
- 2009-09-21 EP EP09832268.8A patent/EP2358636B1/en active Active
- 2009-09-21 CN CN200980149231.6A patent/CN102245508B/en not_active Expired - Fee Related
- 2009-09-21 WO PCT/US2009/057619 patent/WO2010068321A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4053579A (en) * | 1975-05-29 | 1977-10-11 | Agency Of Industrial Science & Technology | Method for manufacture of sintered alumina from ammonium aluminum carbonate hydroxide |
US4356157A (en) | 1980-08-14 | 1982-10-26 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Synthesis of dawsonites |
WO1987001365A1 (en) * | 1985-08-27 | 1987-03-12 | Chevron Research Company | Process for producing a high surface area alumina |
US20060194885A1 (en) * | 1999-12-27 | 2006-08-31 | Showa Denko K.K. | Alumina particles, production process thereof, composition comprising the particles and alumina slurry for polishing |
US20050201928A1 (en) * | 2004-03-12 | 2005-09-15 | Sumitomo Chemical Company, Limited | Method for producing alpha-alumina particle |
Non-Patent Citations (1)
Title |
---|
See also references of EP2358636A4 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102020302A (en) * | 2010-12-15 | 2011-04-20 | 中国铝业股份有限公司 | Method for reducing content of sodium in aluminum hydroxide |
CN111233017A (en) * | 2019-11-22 | 2020-06-05 | 中国石油大学(华东) | Process for synthesizing monoclinic phase basic ammonium aluminum carbonate and preparing porous alumina by pyrolysis of monoclinic phase basic ammonium aluminum carbonate |
CN111233017B (en) * | 2019-11-22 | 2023-10-27 | 中国石油大学(华东) | Process for synthesizing monoclinic phase basic aluminum ammonium carbonate and preparing porous alumina by pyrolysis of monoclinic phase basic aluminum ammonium carbonate |
Also Published As
Publication number | Publication date |
---|---|
JP5425928B2 (en) | 2014-02-26 |
US20100150820A1 (en) | 2010-06-17 |
US8007760B2 (en) | 2011-08-30 |
CA2744576C (en) | 2014-07-08 |
EP2358636A4 (en) | 2015-05-27 |
CA2744576A1 (en) | 2010-06-17 |
EP2358636B1 (en) | 2017-08-09 |
CN102245508B (en) | 2014-03-19 |
EP2358636A1 (en) | 2011-08-24 |
JP2012511496A (en) | 2012-05-24 |
CN102245508A (en) | 2011-11-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8007760B2 (en) | Process for producing enhanced alumina | |
CA2744692C (en) | Process for conversion of aluminum oxide hydroxide | |
Yang et al. | Novel synthesis and characterization of nanosized γ-Al2O3 from kaolin | |
Wu et al. | Synthesis and characterization of mesoporous alumina via a reverse precipitation method | |
CN1673086A (en) | Method for producing alpha-alumina particle | |
Liu et al. | An environmentally friendly method for the synthesis of nano-alumina with controllable morphologies | |
Dabbagh et al. | Formation of γ-alumina nanorods in presence of alanine | |
WO2014135977A2 (en) | Alkaline earth metal aluminate spinels and method for the preparation and use thereof | |
OHTAKE et al. | High thermal-stability ceria synthesized via thermal-hydrolysis route and methane-combustion performance | |
CN108217702A (en) | A kind of method that the synthesis and its pyrolysis of ultramicropore aluminum carbonate basic ammonium prepare aluminium oxide | |
Wu et al. | A green approach of preparation of fine active alumina with high specific surface area from sodium aluminate solution | |
Fan et al. | Synthesis of MgO nanostructures through simple hydrogen peroxide treatment for carbon capture | |
Siahpoosh et al. | Facile synthesis of γ-alumina nanoparticles via the sol-gel method in presence of various solvents | |
JPH0925119A (en) | Production of heat resistant transition alumina | |
Valova et al. | Active Sites on the Surface of Nano-Sized SiO 2–TiO 2 Composites | |
JP2000256011A (en) | Boehmite and its production | |
Molina et al. | Ammonium alunite and basic aluminum sulfate: effect of precipitant agent | |
Kominami et al. | Thermal Decomposition of Titanium Alkoxide and Silicate Ester in Organic Solvent: A New Method for Synthesizing Large‐Surface‐Area, Silica‐Modified Titanium (IV) Oxide of High Thermal Stability | |
Fedoročková et al. | Simplified waste-free process for synthesis of nanoporous compact alumina under technologically advantageous conditions | |
Matveev et al. | Effect of the Ammonium Aluminium Carbonate Hydroxide Preparation Method on Morphological Properties of Aluminium Oxide | |
Moore et al. | Chemical synthesis of monocalcium aluminate powders | |
Pacewska et al. | Influence of aluminium precursor on physico-chemical properties of aluminium hydroxides and oxides Part II. Al (ClO 4) 3· 9H 2 O | |
CN113651350B (en) | Method for preparing stable porous amorphous calcium carbonate in alcohol solvent | |
JPH09110419A (en) | Heat resistant transition alumina and its production | |
Kharlanov et al. | Dependence of the Physicochemical and Catalytic Properties of Ce 0.5 Zr 0.5 O 2 Oxide on the Means of Synthesis |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200980149231.6 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 09832268 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2744576 Country of ref document: CA Ref document number: 3925/DELNP/2011 Country of ref document: IN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2011540721 Country of ref document: JP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
REEP | Request for entry into the european phase |
Ref document number: 2009832268 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2009832268 Country of ref document: EP |