How to package Raney nickel


Raini nickel packaging, because it is a flammable and harmful substance, the packaging box is filled with vermiculite in the preparation of Raney nickel, the raw material nickel used is a carcinogen (group 2B, EU Class 3) and teratogens considered by the Internation Agency for Research on Cancer, and inhalation of fine alumina particles can cause bauxite pneumoconiosis, so the preparation of Raini nickel must be careful. In the activation process, because its surface area is gradually increasing and the hydrogen produced by the leaching reaction is constantly adsorbed, the activated Raini nickel has medium flammability, so the reaction in which Raini nickel participates should be treated in an inert gas environment.
   
Reni nickel packaging
  
After activation, the resulting catalyst is washed with distilled water at room temperature to remove any residual sodium aluminate. Oxygenated water stores Laney nickel because it prevents the oxidation of Lanny nickel and reduces the risk of combustion. Therefore, the usually supplied Raini nickel is a 50% slurry object mixed in water, do not expose it to air. The slurry is packed into reagent bottles and placed in a box, which is filled with chemically stable vermiculite before being transported.
  
Raininickel after participating in the reaction may still contain a large amount of hydrogen and cannot be discarded at will. Should be destroyed in a ventilated place. Ranie nickel produces harmful gases when burned, so it is recommended to use gas masks when destroying Raininickel and fighting fires caused by Raininickel. In addition, direct exposure to Raininickel may cause inflammation of the respiratory tract and can also cause irritating damage to the eyes and skin. Inhalation can cause fibrosis in the nasal passages and lungs. Ingestion can lead to seizures and intestinal disorders. Long-term exposure may lead to pneumonia and other markers sensitizing nickel-like rash, known as nickel itching.

 

 

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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.