偏钨酸铵水合物
Ammonium metatungstate hydrate
CAS: 12333-11-8
Molecular Formula: H28N6O41W12
偏钨酸铵水合物 - Names and Identifiers
| Name | Ammonium metatungstate hydrate |
| Synonyms | Ammonium Metatungstate Ammonium metatungstate hydrate |
| CAS | 12333-11-8 |
偏钨酸铵水合物 - Physico-chemical Properties
| Molecular Formula | H28N6O41W12 |
| Molar Mass | 2974.32 |
| Density | 2.3000 |
| Melting Point | 100 °C (dec.)(lit.) |
| Storage Condition | Room Temprature |
偏钨酸铵水合物 - Risk and Safety
| Hazard Symbols | Xn - Harmful |
| Risk Codes | R22 - Harmful if swallowed |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S39 - Wear eye / face protection. S60 - This material and its container must be disposed of as hazardous waste. |
偏钨酸铵水合物 - Production process of ammonium metatungstate
Author:
Abstract:
In this paper, the process equipment of acid neutralization method and thermal dissociation method are emphatically introduced, and the catalyst is tested.
Key words:
acid neutralization thermal dissociation catalyst granulation ammonium metatungstate
DOI:
CNKI:SUN:JXYS.0.1991-01-003
cited:
year:
1991
Last Update：2024-01-02 23:10:35
偏钨酸铵水合物 - Production method of ammonium metatungstate
from VIP Journal Professional Edition
Author:
Abstract:
In this paper, the properties and unique uses of ammonium metatungstate are discussed, and its preparation principle is analyzed. The advantages and disadvantages of various preparation methods and equipment of ammonium metatungstate in recent years are emphatically reviewed. It is considered that the thermal degradation method using ammonium paratungstate as raw material is the most competitive method at present.
Key words:
ammonium metatungstate properties preparation
DOI:
CNKI:SUN:SFYJ.0.1993-01-005
cited:
year:
1993
Last Update：2023-08-16 22:05:47
偏钨酸铵水合物 - Morphology and particle size of ammonium metatungstate microspheres prepared by spray drying method
from VIP
Author:
Shengjiang peak , Chunan Ma Zhang Cheng , Li Guohua , Zhang Wei-Min
Abstract:
ammonium metatungstate (AMT) is one of the precursors of tungsten carbide (WC) catalyst. The surface morphology and particle size distribution of WC particles are affected by the properties of the precursor, and ultimately affect its catalytic activity. The working principle of air flow spray drying and centrifugal spray drying was introduced. AMT microspheres with different morphologies were successfully prepared by two different spray methods, and the morphology and particle size of the microspheres were studied. The results show that the powder is solid spherical after centrifugal spray drying, and hollow spherical after air flow spray drying. The effects of feed concentration, feed rate and surfactant on the particle size of AMT microspheres were investigated under the condition of airflow spray drying. The results show that the feed concentration has the greatest influence on the particle size of the microspheres. Under different drying conditions, the minimum median diameter (d50) of the prepared spherical powder is 2.26 μm. The above results are spray microspheres. The preparation of mesoporous hollow spherical WC catalyst by gas-solid reaction and the control of its morphology and particle size provide a reference.
stowed
Key words:
spray drying morphology granularity microspheres ammonium metatungstate
DOI:
10.3321/j.issn:1003-9015.2008.01.023
cited:
year:
2008
Last Update：2023-08-16 22:05:47
偏钨酸铵水合物 - Preliminary Study on preparation of ammonium metatungstate solution by bipolar membrane electrodialysis
from Wanfang
Author:
formerly , Zhang Guiqing , Guan Wenjuan , Shang Guanghao
Abstract:
A new process for the preparation of ammonium metatungstate by bipolar membrane electrodialysis was proposed. The results show that the bipolar membrane electrodialysis can effectively convert ammonium tungstate solution into ammonium metatungstate solution, the process runs stably, the current efficiency reaches 73.84%, and the DC power consumption per ton of WO3 is only 864.3 · h, the yield of WO3 was more than 99.5%. The new process directly uses industrial ammonium tungstate solution as raw material, which has the characteristics of low raw material cost, high yield, good product quality and environmental friendliness.Key words:
ammonium metatungstate; Bipolar membrane; Electrodialysis
DOI:
10.3969/j.issn.1009-0622.2012.02.008
cited:
year:
2012
Last Update：2023-08-16 22:05:47
偏钨酸铵水合物 - Introduction
nature:
1. Ammonium metatungstate hydrate is a white crystalline solid.
2. Soluble in water and hot water, but insoluble in alcohol solvents.
3. It is an important tungsten compound with extensive applications in chemical, metallurgical, electronic and other fields.
Usage:
1. In catalyst preparation, ammonium metatungstate hydrate is commonly used as a tungsten source for catalyst preparation and modification.
2. In microstructure research, it can be used as a staining reagent to enhance the contrast of samples under the microscope.
3. In electron microscopy, ammonium metatungstate hydrate is commonly used to coat samples, thereby enhancing the contrast and clarity of images.
Method:
The preparation process of ammonium tungstate hydrate involves heating and dissolving ammonium tungstate with an appropriate amount of water, then cooling and crystallizing to obtain the product of the hydrate.
Security information:
1. Ammonium metatungstate hydrate belongs to inorganic salt compounds and generally has no significant harm to human health.
2. Avoid contact with skin and eyes, and wear safety protective equipment such as gloves and goggles during operation.
3. If unexpected contact occurs, rinse immediately with plenty of water.
4. During storage and handling, contact with strong oxidants or reducing agents should be avoided.
Last Update：2024-07-10 13:57:22
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Tel: 0086-551-65418684
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View History
偏钨酸铵水合物
N-(3-DIMETHYLAMINOPROPYL)-N'-ETHYLCARBODIIMIDE HYDROCHLORIDE
芴甲氧甲酰基-D-天冬氨酸Β叔丁酯
2-叔丁基环己醇
1-氰基环丙烷-1-羧酸乙酯
6-(甲氧羰基)环己-3-烯-1-羧酸
CIS-ALLETHRIN
5-正丁氨基-4-苯氧基-3-氨基磺酰基苯甲酸
Methanone, (4-methylphenyl)[4-(methylthio)phenyl]-
SODIUM 4-AMINOSALICYLATE DIHYDRATE
N-(3-DIMETHYLAMINOPROPYL)-N'-ETHYLCARBODIIMIDE HYDROCHLORIDE
芴甲氧甲酰基-D-天冬氨酸Β叔丁酯
2-叔丁基环己醇
1-氰基环丙烷-1-羧酸乙酯
6-(甲氧羰基)环己-3-烯-1-羧酸
CIS-ALLETHRIN
5-正丁氨基-4-苯氧基-3-氨基磺酰基苯甲酸
Methanone, (4-methylphenyl)[4-(methylthio)phenyl]-
SODIUM 4-AMINOSALICYLATE DIHYDRATE