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Ammonium Metatungstate for Petroleum Catalyst 194

Ammonium metatungstate is the main raw material of tungsten-based catalyst, which can greatly improve the catalytic performance of the prepared product. In recent years, with the development of petroleum refining and petrochemical industries, the amount of tungsten compounds has also increased. Ammonium metatungstate is an inorganic compound with a chemical formula of H28N6O41W12, a molecular weight of 2974.32, with white or light yellow color, the purity is up to 99.95%, and main content of WO3 is up to 83.0%. It…

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How to Prepare Ammonium Metatungstate from Waste Tungsten Oxide? 198

In the existing technology, using waste tungsten oxide (WO3) as a raw material, only low value-added ammonium paratungstate (APT) can be obtained, and high value-added ammonium metatungstate (AMT) products cannot be obtained. Moreover, WO3 waste ammonia after leaching, APT is needed to crystallize, so a crystallization reactor is necessary, and the investment in crystallization reactor equipment is relatively large, resulting in higher production costs and poor economic benefits, and the recovery rate of WO3 waste is low. Therefore, it is…

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Cesium Doped Tungsten Oxide for Heat Insulation Film 211

As a new type of transition metal compound material, cesium doped tungsten oxide nano particles have excellent near-infrared absorption performance and visible light transmission performance, and are often used to prepare high-quality transparent heat insulation film. Its application range is wide. The heat insulation film is to achieve the effect of heat insulation and energy saving by means of heat insulation materials. Traditional thermal insulation materials include glass fiber, asbestos, rock wool, silicate, etc., while new thermal insulation materials include…

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Cesium Doped Tungsten Oxide Powder for Thermal Insulation Glass 198

Compared with single component tungsten oxide powder, the optical performance of cesium doped tungsten oxide powder is more superior, that is, the absorption ability of infrared rays is stronger, and the transmittance of visible light is higher. It has wide application range in block of near infrared light and thermal insulation glass. How to prepare cesium doped tungsten oxide nano powder with reasonable cost and high product stability? (1) Dissolve the raw material tungsten salt and cesium salt in a…

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How to Make Tungsten Carbide Preparation 263

Tungsten carbide (chemical formula WC) is the compound made up of tungsten and carbon, following will show the preparation procedure. The molecular formula is WC and the molecular weight is 195.85, which is black hexagonal crystal with metallic luster and has similar hardness to diamond. It is a good conductor of electricity and heat. WC is insoluble in water, hydrochloric acid and sulfuric acid, but easily soluble in the mixed acid of nitric acid and hydrofluoric acid. Pure WC is…

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Preparation of Molybdenum Carbide 493

Molybdenum carbide (chemical formula MoC) has the characteristics?of high melting point, hardness, good thermal, fine mechanical stability and excellent corrosion resistance. Molybdenum is a kind of silvery white refractory metal with melting point of 2615℃ and density of 10.2g/cm3, its expansion coefficient is almost the same as that of the special glass used in electron tubes. Molybdenum is stable at room?temperature and oxidizes rapidly above 600℃. It reacts with carbon, hydrocarbon or carbon monoxide to generate MoC above 800℃. Preparation…

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Preparation Methods of Molybdenum Carbide 308

With the development of chemical engineering technology, there are a series of synthesis methods used to produce nanometer scale pure molybdenum carbide (chemical formula MoC)?, the followings are five common preparation methods: 1.0 Temperature programmed reduction method The temperature programmed method raised in the 1980s is still the most widely used method to obtain MoC in the laboratory, during the reaction experiment, molybdenum oxide is used as molybdenum source, hydrocarbon gas and hydrogen are used as basic materials for carbon…

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Influence Factors of Nanostructured Tungsten Trioxide Preparation 242

During the process of nanostructured WO3 synthesis it is found that citric acid content, system pH value before hydrothermal synthesis, hydrothermal reaction temperature and hydrothermal reaction time will have great influence on the product, therefore the following will focus on several influence factors affecting the phase and morphology of nanostructured WO3. 1.0 Effect of citric acid content on nanostructured WO3 The morphology of WO3 nanostructures prepared with different citric acid content is significantly different, with the increase of citric acid…

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Liquid Phase Method for Preparing Nano Tungsten Trioxide 263

Liquid phase method is the most widely used method among many methods for synthesizing nano tungsten trioxide. Its advantage is that the nano structured WO3 particles are fine and evenly distributed, the content of the chemical components can be precisely controlled, the morphology of the nanostructured WO3 can be controlled by adjusting the morphology control agent, the synthetic process is simple, economical and good to mass production. There are four main methods including hydrothermal synthesis, sol-gel method, precipitation method and…

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The Gas Sensitivity of Nano Plate Shaped Tungsten Trioxide 205

This article will discuss the gas sensitivity of nano plate shaped tungsten trioxide gas sensor at different concentration of ethanol gas, acetone gas, ammonia gas and formaldehyde gas in terms of temperature-sensitivity. As semiconductor material with good sensitivity to various toxic gases, nanostructured tungsten trioxide can effectively improve the sensitivity and response speed of gas sensors. The gas sensor using nanostructured tungsten trioxide as gas sensitive material can be done to make lower thickness detection of target gas, which can…

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