253

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  • DOI
  • Date of creation in the UzSCI system 15-07-2021
  • Read count 253
  • Date of publication 27-03-2021
  • Main LanguageIngliz
  • Pages36-44
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A technology has been developed for the production of alloy nickel hydrogenation catalysts unsaturated. The results of a study of the phase, chemical compositions and structure of nickel alloys and catalysts showed that the introduction of ferroalloys as a modifying additive affects the NiAl3 / Ni2Al3 ratio. The studied alloying metals are practically insoluble in alkali and are in the catalyst in dissolved states. All these changes favorably affect the catalytic properties of modified nickel catalysts in the benzene hydrogenation reaction. A systematic study of the activity of stationary catalysts with the addition of ferroalloys in the continuous catalytic hydrogenation of benzene was carried out with a wide variation of the process parameters. All catalysts are dominated by particles with R = 0-2 microns, the concentration of which reaches 75-89%. Table 1 shows that, with an increase in the amount of additives in alloys from 3 to 9% by weight, the concentration of particles with R = 0-2 μm in catalysts decreases differently within 89-75%, depending on the nature of the alloying metals. In addition, modifying additives also increase the concentration of particles with R = 2-4 μm. The results of optical microscopy show that almost all of the studied skeletal nickel catalysts are enriched by 90-99% in particles with Rmax = 1-5 μm. A systematic study of the activity of stationary catalysts with addition of ferroalloys in the reaction of continuous catalytic hydrogenation of benzene with a wide variation of the parameters of the technological process has been carried out. At the same time, highly active, stable and selective for cyclohexane new stationary catalysts for industrial purposes operating at temperatures up to 140°C and pressure up to 8 MPa.

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