Tungsten Carbide Supported Cobalt-Nickel Catalyst

tungsten carbide supported cobalt-nickel catalyst image

With the increasing consumption of petroleum resources, the new synthetic route of preparing high value-added liquid chemicals and other organic chemicals with natural gas as an alternative energy source has attracted great attention from all over the world. The preparation of syngas by partial oxidation of natural gas is an important intermediate link in the realization of natural gas conversion, and the research and development of efficient catalysts is the key.

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Immobilized Phosphotungsten Heteropoly Acid Preparation by Extraction

immobilized Phosphotungsten heteropoly acid preparation image

In the conventional preparation of phosphotungstic acid, a large amount of ether is used to extract the reaction liquid of phosphotungstic heteropoly acid, and a yellowish transparent oily ether-phosphotungstic heteropoly acid is obtained. The solid product of yellowish phosphotungstic heteropoly acid is obtained by blowing ether with air. Moreover, the ether used in the whole extraction process is difficult to recycle, resulting in waste of resources and environmental pollution.

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Tungsten-Molybdenum Ore Recovery from Molybdenum Sulfide Flotation Tailings

tungsten-molybdenum ore recovery from molybdenum sulfide flotation tailings image

Tungsten and molybdenum are two non-renewable strategic mineral resources. Because of their unique properties, they are widely used in steel, military, aerospace, electronics, electrical appliances and chemical industries. With the development of social economy, the demand for tungsten and molybdenum is increasing, and the reserves of tungsten and molybdenum resources are decreasing sharply. However, there are a large number of poor, fine and miscellaneous refractory tungsten and molybdenum resources in our country. For refractory tungsten and molybdenum ores, especially for tungsten and molybdenum ores with high oxidation rate, no effective recovery method has been found.

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Phosphotungstic Acid-Organometallic Framework Catalytic Material

phosphotungstic acid-organometallic framework catalytic material image

Biomass can be regarded as a promising alternative energy source for petroleum. The key to convert biomass into important energy materials and basic platform compounds is to convert cellulose, an important component of biomass, into glucose by directional hydrolysis.

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Tungstate Red Phosphor

tungstate red phosphor image

White LED is a new solid-state lighting electric light source (SSL). Its principle and structure are different from those of previous vacuum electric light sources such as incandescent lamp and fluorescent lamp. SSL light source has many advantages, especially high light efficiency, energy saving, long life and pollution-free. It has great application value and prospects.

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Tungsten Carbide-Titanium Carbide Solid Solution New Preparation Process

tungsten carbide-titanium carbide solid solution image

The traditional method of preparing tungsten carbide-titanium carbide solid solution is to use industrial titanium dioxide and WC as raw materials, carbon black as reducing agent, mix with ball mill, and react in graphite tube electric furnace at the temperature of 2000-2300 ℃. The preparation method has the following shortcomings: first, the ball mill has low ball milling efficiency, mainly mixing effect on raw materials and little crushing effect. Second, the high reaction temperature makes the sintering growth of the prepared tungsten carbide-titanium carbide solid solution obvious.

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SCR Catalyst Recovery Process Improvement

SCR catalyst recovery process improvement image

SCR denitrification technology has the advantages of high denitrification efficiency, over 90%, good selectivity and reliable technology. Catalyst is the core of SCR denitrification technology. At present, the commonly used SCR denitrification catalyst is based on titanium dioxide as carrier, V2O5 as active component, WO3 or MoO3 as structural promoter. The activity of catalyst directly determines the efficiency of denitrification.

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Titanium Tungsten Alloy by Molten Salt Electrolysis

titanium tungsten alloy by molten salt electrolysis image

At present, the main methods for preparing Ti-W alloys are high temperature vacuum melting, powder metallurgy and mechanical alloying. However, these methods have some disadvantages, such as high production cost, complex process or low purity of products, which reduce the properties of Ti-W alloys and greatly limit their application.

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Silver Tungstate Photocatalyst Preparation

silver tungstate photocatalyst preparation image

Tungsten oxide is a semiconductor photocatalyst with visible light response. Tungsten oxide particles can absorb most of the visible light occupying the room space. However, because the conduction band is located at the energy level of oxygen-specific oxidation-reduction, oxygen can not be reduced in the electrons stimulated by the conduction band, and the amount of reactive oxygen species is insufficient. Therefore, tungsten oxide can not show high photocatalytic activity in the environment of visible light irradiation but not ultraviolet light irradiation.

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How to Extract Cobalt and Tungsten from Waste Cemented Carbide

how to extract cobalt and tungsten from waste cemented carbide image

With the rapid development of economy, the demand for tungsten and cobalt in machinery manufacturing, geology, mining, construction, electronics and chemical industries is increasing. As rare metal elements, tungsten and cobalt are also the main raw materials of cemented carbide. Therefore, it is very meaningful to recycle tungsten and cobalt from scrap cemented carbide.

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