Kinetic description of deactivation of a supplied nickel catalyst by sodium sulphide

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The kinetics of reactions of liquid-phase hydrogenation of sodium acrylate on catalysts has been studied. Ni/SiO2 with different amounts of deposited nickel were used as a catalyst, as well as samples with controlled partial deactivation of the surface by sulfide ion. Approaches to determining the amount of reduced metal on the catalyst surface and the amount of catalytic poison required to deactivate active centers are shown. Hydrogenation reaction rates and activity were measured. Kinetics were modeled, and rate constants of hydrogenation, adsorption, and desorption of hydrogen were obtained. The number of active centers and their ratio to metal atoms located on the catalyst surface were estimated.

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Yu. Romanenko

Ivanovo State University of Chemistry and Technology

编辑信件的主要联系方式.
Email: Romanenko@isuct.ru
俄罗斯联邦, Ivanovo, 153000

A. Afineevskii

Ivanovo State University of Chemistry and Technology

Email: Romanenko@isuct.ru
俄罗斯联邦, Ivanovo, 153000

D. Prozorov

Ivanovo State University of Chemistry and Technology

Email: Romanenko@isuct.ru
俄罗斯联邦, Ivanovo, 153000

N. Gordina

Ivanovo State University of Chemistry and Technology

Email: Romanenko@isuct.ru
俄罗斯联邦, Ivanovo, 153000

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2. Fig. 1. Survey XPS spectrum (a) and high-resolution XPS spectrum of the Ni2p sublevel (b) of the Ni27.6/SiO2 sample.

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3. Fig. 2. Dependences of the degree of conversion on the reaction time (a) and the rate of hydrogen absorption from the gas phase on the degree of its conversion (b) for a sample of the Ni27.6/SiO2 catalyst with different sulfide content, mmolNa2S/gNi: ▲ – 0, ► – 0.036, ▼ – 0.109, ◄ – 0.217.

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4. Fig. 3. Effect of the amount of added sulfide on the activity of the studied catalysts.

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5. Fig. 4. Kinetic curves of hydrogen absorption from the gas phase for non-deactivated (a) and partially deactivated (b) catalysts with a nickel content of 27.6 (▲), 20.5 (●) and 9.1 wt. % (♦); dots – experiment, lines – calculation

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