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Ammonium metatungstate hydrate

Ammonium metatungstate hydrate

CAS: 12333-11-8

Molecular Formula: H28N6O41W12

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Ammonium metatungstate hydrate - Names and Identifiers

Name Ammonium metatungstate hydrate
Synonyms Ammonium Metatungstate
Ammonium metatungstate hydrate
CAS 12333-11-8

Ammonium metatungstate hydrate - Physico-chemical Properties

Molecular FormulaH28N6O41W12
Molar Mass2974.32
Density2.3000
Melting Point100 °C (dec.)(lit.)
Storage ConditionRoom Temprature

Ammonium metatungstate hydrate - Risk and Safety

Hazard SymbolsXn - Harmful
Harmful
Risk CodesR22 - Harmful if swallowed
Safety DescriptionS26 - 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.

Ammonium metatungstate hydrate - Production process of ammonium metatungstate

Author:

Wei Qingyu

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:

7

year:

1991

Last Update：2024-01-02 23:10:35

Ammonium metatungstate hydrate - Production method of ammonium metatungstate

from VIP Journal Professional Edition

Author:

Zhuang Haixing

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:

7

year:

1993

Last Update：2023-08-16 22:05:47

Ammonium metatungstate hydrate - 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:

29

year:

2008

Last Update：2023-08-16 22:05:47

Ammonium metatungstate hydrate - 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:

15

year:

2012

Last Update：2023-08-16 22:05:47

Ammonium metatungstate hydrate - 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
Ammonium metatungstate hydrate
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Hefei TNJ Chemical Industry Co.,Ltd.
Product Name: Ammonium metatungstate hydrate Request for quotation
CAS: 12333-11-8
Tel: 0086-551-65418684
Email: sales@tnjchem.com
　　　　 info@tnjchem.com
Mobile: 0086 189 4982 3763
QQ: 2881500840 Click to send a QQ message
Wechat: 0086 189 4982 3763
WhatsApp: 0086 189 4982 3763
Product List: View Catalog
Shanghai Yuanye Bio-Technology Co., Ltd.
Product Name: Ammonium metatungstate hydrate Visit Supplier Webpage Request for quotation
CAS: 12333-11-8
Tel: 18301782025
Email: 3008007409@qq.com
Mobile: 18021002903
QQ: 3008007409 Click to send a QQ message
Wechat: 18301782025
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Ammonium metatungstate hydrate
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