Reni Nickel Science Trivia (2)


Raney nickel is a solid-state heterogeneous catalyst composed of fine grains of nickel-aluminum alloy with a porous structure, which was first used as a catalyst by American engineer Murray Raney in the hydrogenation of vegetable oils. [1] 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 the name of Grace Chemicals (W. Rainey". R. Grace and Company), so strictly speaking, only products made by the company's Grace Davison division can be called "Lanny Nickel." The term "metal backbone catalyst" [2] or "sponge-metal catalyst" is used to refer to catalysts with a microporous structure and physical and chemical properties similar to Ranie nickel.
  
In 1897, French chemist Paul Sabattier discovered that trace amounts of nickel could catalyze the hydrogenation of organic matter. [3] Nickel was subsequently applied to the hydrogenation of many organic compounds. In the 1920s, American engineer Murray Rainey began to work on finding better hydrogenation catalysts. In 1924, he used a mixture with a nickel/silicon ratio of 1:1, and after sodium hydroxide treatment, silicon and sodium hydroxide reacted to form a porous structure. Rainey found that the catalyst was five times more potent for the hydrogenation of cottonseed oil than regular nickel. [4] Rainey then used a nickel/aluminum 1:1 alloy to make the catalyst, found that the resulting catalyst was more active, and applied for a patent in 1926. [5] To this day, the 1:1 ratio is still the ratio of alloys needed to produce Raeney nickel.

 

 

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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.