TY - JOUR

T1 - Synthesis of Complex Aluminum–Cobalt Systems Using a Thermoactivated Gibbsite Product

AU - Zhuzhgov, A. V.

AU - Gorkusha, A. S.

AU - Suprun, E. A.

AU - Lysikov, A. I.

AU - Isupova, L. A.

N1 - This work was supported by the Russian Science Foundation, project no. 23-23-00241 (https://rscf.ru/project/23-23-00241/). Synthesis of Complex Aluminum–Cobalt Systems Using a Thermoactivated Gibbsite Product / A. V. Zhuzhgov, A. S. Gorkusha, E. A. Suprun [et al.] // Russian Journal of Physical Chemistry A. – 2024. – Vol. 98, No. 13. – P. 3046-3060. – DOI 10.1134/S0036024424702303.

PY - 2025/1/17

Y1 - 2025/1/17

N2 - Abstract: The authors explore the possibility of synthesizing highly loaded mixed aluminum–cobalt spinels via the hydrochemical treatment of suspensions of a powder of the product of the centrifugal thermal activation of gibbsite in aqueous solutions of cobalt nitrate under room-temperature or hydrothermal conditions via X-ray diffraction, thermal, microscopic, adsorption, and chemical analysis. It is found that the heat treatment of products of hydrochemical interaction (xerogels) in the range of 350–850°C produces Co3O4 and CoAl2O4 spinel phases with different phase ratios, depending on the conditions of synthesis. The hydrochemical treatment of suspensions at room temperature ensures the dominant formation of a Co3O4 phase after calcination, while hydrothermal treatment at 150°C results in deeper interaction between the suspension components during treatment, ensuring the formation of CoAl2O4 after heat treatment. It is shown that the maximum content of CoAl2O4 spinel (90%, according to H2-TPR) is observed for the hydrothermal product calcined at a temperature 850°C. The considered technique yields complex aluminum–cobalt compounds with different phase ratios, allowing the complete elimination of effluents. It also reduces the number of stages of synthesis, the amount of initial reagents, and 75 wt % of the total amount of nitrates, relative to using classical nitrate coprecipitation.

AB - Abstract: The authors explore the possibility of synthesizing highly loaded mixed aluminum–cobalt spinels via the hydrochemical treatment of suspensions of a powder of the product of the centrifugal thermal activation of gibbsite in aqueous solutions of cobalt nitrate under room-temperature or hydrothermal conditions via X-ray diffraction, thermal, microscopic, adsorption, and chemical analysis. It is found that the heat treatment of products of hydrochemical interaction (xerogels) in the range of 350–850°C produces Co3O4 and CoAl2O4 spinel phases with different phase ratios, depending on the conditions of synthesis. The hydrochemical treatment of suspensions at room temperature ensures the dominant formation of a Co3O4 phase after calcination, while hydrothermal treatment at 150°C results in deeper interaction between the suspension components during treatment, ensuring the formation of CoAl2O4 after heat treatment. It is shown that the maximum content of CoAl2O4 spinel (90%, according to H2-TPR) is observed for the hydrothermal product calcined at a temperature 850°C. The considered technique yields complex aluminum–cobalt compounds with different phase ratios, allowing the complete elimination of effluents. It also reduces the number of stages of synthesis, the amount of initial reagents, and 75 wt % of the total amount of nitrates, relative to using classical nitrate coprecipitation.

KW - Co3O4 spinel

KW - CoAl2O4 spinel

KW - gibbsite

KW - product of centrifugal thermal activation of gibbsite

UR - https://www.mendeley.com/catalogue/bb9d162f-55b9-3e22-b5c8-c87bf7cefec8/

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85218110444&origin=inward&txGid=1dbdfd627a325262bc965fe152348bf9

UR - https://elibrary.ru/item.asp?id=79720810

U2 - 10.1134/S0036024424702303

DO - 10.1134/S0036024424702303

M3 - Article

VL - 98

SP - 3046

EP - 3060

JO - Russian Journal of Physical Chemistry A

JF - Russian Journal of Physical Chemistry A

SN - 0036-0244

IS - 13

ER -