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Abstract

The technology has been developed for the production of unsaturated alloy nickel hydrogenation catalysts. The results of the study of the phase, chemical compositions and structure of nickel alloys and catalysts showed that the ferroalloy introduction as a modifying additive affects the NiAl3 / Ni2Al3 ratio. The studied alloying metals are practically insoluble in alkali and exist 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 stationary catalyst activity with addition of ferroalloys in the continuous catalytic benzene hydrogenation 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 studied skeletal nickel catalysts are enriched by 90-99% in particles with Rmax = 1-5 μm. A systematic study of the stationary catalyst activity with addition of ferroalloys in the reaction of continuous catalytic benzene hydrogenation with a wide parameter variation of the technological process has been carried out. At the same time, it is 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.

First Page

36

Last Page

44

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