Characterization and application of amorphous alloy catalysts


Amorphous alloy catalyst exhibits excellent catalytic activity, high selectivity and hydrogenation performance in catalysis, and is a new type of catalytic material with broad development prospects.
 
X-ray diffraction is used to determine amorphous structures. The diffraction peak of amorphous alloys is characterized by a diffuse peak around 2θ=45 °C, rather than a separated spike as exhibited by crystalline alloys.
 
The hydrogenation of nitriles to primary amines is widely used in the production of nylons, surfactants, pharmaceuticals and fertilizer intermediates. Hydrogenation of acetonitrile to ethylamine is an important intermediate in chemical production (such as fertilizers, surfactants, etc.) and drug production (such as vitamin B), and has important industrial application value. Nano-amorphous alloy catalysts were prepared by chemical reduction and the hydrogenation performance of acetonitrile was investigated. It is believed that amorphous alloy catalysts can obtain high activity and excellent selectivity. More suitable for acetonitrile hydrogenation than Raney Ni.
 
Sorbitol is a raw material for the synthesis of ascorbic acid and the manufacture of explosives, and can also be used as an additive for moisturizers, lotions and toothpastes or as a thickener for paper and fibers, and can also be used in synthetic resins. surfactants and defoamers, etc., so it is a product with a wide range of uses. It is mainly produced by hydrogenation of glucose. ZL-2 amorphous alloy catalyst was used in glucose hydrogenation reaction, and the effects of temperature, pressure, pH value, agent-to-sugar ratio and reaction time on hydrogenation reaction were investigated, and compared with Raney Ni catalysts. The results showed that the glucose hydrogenation activity of the amorphous alloy catalyst was better than that of Raney Ni catalyst, which was reusable and maintained high activity. Its hydrogenation conversion rate is higher than that of similar foreign catalysts.
 
Using ultrasonic technology, amorphous catalysts were prepared. Cyclobutene sulfone was hydrogenated to cyclobutyl sulfone as a probe reaction. The catalytic performance of amorphous catalysts is investigated, and the results show that the amorphous structure is not affected by ultrasonic waves, and the introduction of ultrasonic waves can improve the dispersion degree of the active components, improve the particle size of the active components, and improve their hydrogenation performance, which provides an effective method for the preparation of amorphous catalysts.
 
The amorphous alloy was used for the hydrogenation of chlorinated nitrobenzene in liquid phase to produce chloroaniline, and the results showed that its catalytic activity and selectivity were significantly higher than those of Raney Ni catalyst. At the same time, it also has high thermal stability and has a wide range of industrial application prospects.
 
In addition, amorphous alloy catalysts also showed good catalytic performance in oil hydrogenation, nitrobenzene hydrogenation, furfural hydrogenation to furfuryl alcohol.
 
Due to the unique structural characteristics of amorphous alloy catalysts, nanoscale amorphous alloy catalysts integrate the characteristics of ultrafine particles and amorphous alloys. Especially in the field of catalytic hydrogenation, it shows excellent catalytic performance, has the advantage of replacing traditional industrial skeleton nickel, and can reduce environmental pollution, which is of great significance for energy conservation and consumption reduction of enterprises under the rising price of nickel. Amorphous alloy is one of the most promising, efficient and environmentally friendly catalytic materials, and has shown good catalytic performance in hydrogenation industrial applications such as olefins, nitro and hydroxyl.

 

 

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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.