Reni nickel catalyst science knowledge(1)


Physical and chemical properties: Reni nickel catalyst before activation is silver-gray amorphous powder (nickel-aluminum alloy powder), with a moderate degree of flammability, partial activation in the presence of water and the production of hydrogen easy agglomeration, long-term exposure to air is easy to weather. Nickel-aluminum alloy powder is activated into gray-black particles, accompanied by active hydrogen, extremely unstable, oxidative combustion in the air, must be immersed in water or ethanol for preservation. It was first used by American engineer Murray Rainey as a catalyst in the hydrogenation of vegetable oils. The preparation process is to treat nickel-aluminum alloy with concentrated sodium hydroxide solution, in this process, most of the aluminum will react with sodium hydroxide and dissolve, leaving a lot of micropores of different sizes. In this way, the surface of Raininickel is a fine gray powder, but from a microscopic point of view, each tiny particle in the powder is a three-dimensional porous structure, this porous structure greatly increases its surface area, and the large surface area brings high catalytic activity, which makes Raininickel widely used as a heterogeneous catalyst in organic synthesis and industrial hydrogenation reactions. Since "Rainey" is a registered trademark of Grace Chemicals, strictly speaking, only products manufactured by the company's Davidson Chemical Division can be called "Lanny Nickel". The term "metal backbone catalyst" or "sponge-metal catalyst" is used to refer to catalysts with a microporous structure and physical and chemical properties similar to Raney nickel.
   
Uses: This product is mainly used in the catalytic hydrogenation reaction of basic organic chemicals. It can be used for hydrogenation of hydrocarbon bonds of organic matter, hydrogenation of carbon-nitrogen bonds, hydrogenation of nitroso compounds and nitrous compounds; The hydrogenation of azo and oxide azo compounds, imides, amines and benzobenzene can also be used for dehydration reactions, ring forming reactions, condensation reactions, etc. The most typical applications are glucose hydrogenation and adionitrile hydrogenation. It has a wide range of applications in medicine, dyes, oils, spices, synthetic fibers and other fields.  For example: glucose hydrogenation to produce sorbitol for the synthesis of vitamin C, resin surfactants, etc. Phenol catalytic hydrogenation produces hexadiol for the preparation of hexanediamine, paints and coatings. Hydrogenation of adiponitrile to produce hexadiamine is an important monomer of polyamide fibers. Tetrahydrofuran catalyzed hydrogenation to produce tetrahydrofuran is a good solvent. Fatty acid ammoniation after hydrogenation to produce fatty primary amines is widely used in organic chemical production. Cyclohexylamine prepared by hydrogenation of aniline is used in the synthesis of desulfurizers, corrosion inhibitors, vulcanization accelerators, emulsifiers, antistatic agents, fungicides, etc.

 

Related news


Reni nickel catalyst science knowledge(1)

Physical and chemical properties: Reni nickel catalyst before activation is silver-gray amorphous powder (nickel-aluminum alloy powder), with a moderate degree of flammability, partial activation in the presence of water and the production of hydrogen easy agglomeration, long-term exposure to air is easy to weather. Nickel-aluminum alloy powder is activated into gray-black particles, accompanied by active hydrogen, extremely unstable, oxidative combustion in the air, must be immersed in water or ethanol for preservation. It was first used by American engineer Murray Rainey as a catalyst in the hydrogenation of vegetable oils. The preparation process is to treat nickel-aluminum alloy with concentrated sodium hydroxide solution, in this process, most of the aluminum will react with sodium hydroxide and dissolve, leaving a lot of micropores of different sizes. In this way, the surface of Raininickel is a fine gray powder, but from a microscopic point of view, each tiny particle in the powder is a three-dimensional porous structure, this porous structure greatly increases its surface area, and the large surface area brings high catalytic activity, which makes Raininickel widely used as a heterogeneous catalyst in organic synthesis and industrial hydrogenation reactions. Since "Rainey" is a registered trademark of Grace Chemicals, strictly speaking, only products manufactured by the company's Davidson Chemical Division can be called "Lanny Nickel". The term "metal backbone catalyst" or "sponge-metal catalyst" is used to refer to catalysts with a microporous structure and physical and chemical properties similar to Raney nickel.