Innovation and integration of amorphous alloy catalysts


In terms of amorphous alloy catalysts, the structure of crystalline catalysts is amorphous, which makes a qualitative leap in the hydrogenation performance of the widely used Raney nickel catalyst. By adding rare earth elements with large atomic radius to improve the crystallization potential energy barrier and using alkali extraction aluminum technology, the limitations of poor thermal stability and small specific surface area of amorphous alloys as practical catalytic materials were broken. Hydrogen treatment is used to improve amorphousness; Comprehensive utilization of by-product waste lye to synthesize molecular sieve; Design of key equipment such as nozzles, crucibles and cooling copper rollers; Heteroatoms were introduced to adjust the hydrogenation activity, acid resistance and magnetism of various functional groups to form an amorphous alloy series catalyst. A production device for 100-ton amorphous alloy catalysts with feasible technology, economic rationality and green environmental protection has been built.
  
In terms of magnetically stable bed technology, combined with the magnetic formation of uniform magnetic field and amorphous alloy catalyst to form a magnetically stable bed reaction process, a magnetic barrier for regulating the magnetic field was designed, a mathematical model of the magnetic field and reactor that could guide industrial production was established, and the applicable process flow for different reactions was proposed. The effect of this technology for caprolactam hydrorefining is 5~10 times that of the kettle process, the catalyst consumption is reduced by 70%, and the reaction airspeed can reach 40h-l.
  
Amorphous alloy catalyst and its magnetically stable bed integration technology have been hydrorefined with caprolactam respectively, the technology is also used in the hydrogenation process of pharmaceutical intermediates and glucose hydrogenation to prepare sorbitol in a number of manufacturers, and has completed industrial tests for hydrogen refining deCO, aromatic hydrocarbon adsorption desulfurization and other processes.
  
The first industrial application of amorphous alloy catalyst and magnetically stable bed reaction process in the world has made leapfrog progress in China's hydrogenation technology and produced huge economic and social benefits.

 

 

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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.