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Ammonium metatungstate microsphere may be prepared by two different spray drying methods. Ammonium metatungstate (AMT) is usually used as one of the precursors of tungsten carbide (WC) catalysts. And the morphology and particle size distribution of WC microsphere are affected by the properties of precursor. In other words, AMT properties will have an important influence on morphology and particle size distribution of WC microsphere and have a finally effect on the catalytic activity of WC catalyst. Therefore, it is necessary…

Ammonium metatungstate solution is an aqueous solution of ammonium metatungstate (AMT), which may be prepared using ammonium tungstate solution as raw material by Bipolar Membrane Electrodialysis (BMED). AMT solution may be used as raw material for producing its downstream products by liquid phase process. AMT is extremely easily soluble in water, and its solubility in water increases with the increase of temperature. BMED is a new membrane separation technology, which has been widely applied in the preparation of acid, alkali,…

Ammonium metatungstate, AMT for short, a kind of white crystallized powder, is mainly applied for petroleum industry. And it can also be used in the manufacture of various petrochemical catalysts and other tungsten compounds. Its molecular formula is (NH4) 6H2W12O40 ? XH2O. AMT is usually used as one of the precursors of tungsten carbide (WC) catalyst, and the properties of AMT precursor affect the morphology and size distribution of WC microsphere, which have a finally effect on the catalyst activity.…

Partial oxidation of natural gas for preparing synthesis gas is an important intermediate link for realizing the transformation of natural gas, while the researching and development of efficient catalyst is the key. As the main component of natural gas, the new synthetic route of methane as alternative energy for manufacturing high value-added liquid chemicals and other organic chemical is attached great concerns all around the world. The preparation of tungsten carbide supported of cobalt nickel catalyst by the synthesis gas…

Arsenic doped ammonium metatungstate (AMT) is generated by adding ammonium metatungstate into the nitric acid solution of elemental arsenic and stirring, drying and grinding, the excellent raw material for preparing nano tungsten powder. Nano tungsten powder is the tungsten powder which the particle size is fine to nanoscale, at present, the traditional method for manufacturing nano tungsten powder is tungsten oxide reduction method, wherein the reducing agent maybe hydrogen or carbon; with the appearing of nano materials, the manufacture methods…