Highly dispersed chromium(III) molybdate powders obtained by solid phase synthesis
Objectives. To obtain highly dispersed powders of chromium(III) molybdate Cr2(MoO4)3 by solid phase synthesis and to study their porous structure.Methods. After stirring in water, a mixture of Cr2O3 and MoO3 oxide powders was dried in air and subjected to heat treatment in the temperature range of 6...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | Russian |
| Published: |
MIREA - Russian Technological University
2025-01-01
|
| Series: | Тонкие химические технологии |
| Subjects: | |
| Online Access: | https://www.finechem-mirea.ru/jour/article/view/2197 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850028735772753920 |
|---|---|
| author | M. N. Miroshnichenko V. N. Kolosov |
| author_facet | M. N. Miroshnichenko V. N. Kolosov |
| author_sort | M. N. Miroshnichenko |
| collection | DOAJ |
| description | Objectives. To obtain highly dispersed powders of chromium(III) molybdate Cr2(MoO4)3 by solid phase synthesis and to study their porous structure.Methods. After stirring in water, a mixture of Cr2O3 and MoO3 oxide powders was dried in air and subjected to heat treatment in the temperature range of 600–800°C. After heat treatment, the products were identified by X-ray phase and sedimentation analysis. The specific surface area was measured using the Brunauer–Emmett–Teller static adsorption method. Porosity parameters were measured using the Barrett–Joyner–Halenda (BJH) method.Results. The Gibbs free energy ΔG of the reaction between chromium and molybdenum oxides was calculated and it was shown that the process is characterized by a significant negative value of ΔG. Concurrently, the Gibbs energy exhibits a relatively weak dependence on temperature. The highly dispersed chromium(III) molybdate powders with specific surface area of 15.3–29.7 m2·g−1 obtained in this way were pure according to X-ray diffraction analysis. A study of the volume, diameter, and pore size distribution was conducted through the utilization of nitrogen adsorption–desorption isotherms in accordance with the BJH model.Conclusions. It was demonstrated that Cr2(MoO4)3 powders possess a mesoporous structure and are distinguished by a bimodal pore system comprising small pores with a diameter of 2–3 nm and larger pores with a diameter ranging from 15 to 30 nm. |
| format | Article |
| id | doaj-art-903dcc26c22a4d64ba6d5f4b50646952 |
| institution | DOAJ |
| issn | 2410-6593 2686-7575 |
| language | Russian |
| publishDate | 2025-01-01 |
| publisher | MIREA - Russian Technological University |
| record_format | Article |
| series | Тонкие химические технологии |
| spelling | doaj-art-903dcc26c22a4d64ba6d5f4b506469522025-08-20T02:59:45ZrusMIREA - Russian Technological UniversityТонкие химические технологии2410-65932686-75752025-01-0119654755410.32362/2410-6593-2024-19-6-547-5541789Highly dispersed chromium(III) molybdate powders obtained by solid phase synthesisM. N. Miroshnichenko0V. N. Kolosov1Tananaev Institute of Chemistry – Subdivision of the Federal Research Center “Kola Science Center of the Russian Academy of Sciences”Tananaev Institute of Chemistry – Subdivision of the Federal Research Center “Kola Science Center of the Russian Academy of Sciences”Objectives. To obtain highly dispersed powders of chromium(III) molybdate Cr2(MoO4)3 by solid phase synthesis and to study their porous structure.Methods. After stirring in water, a mixture of Cr2O3 and MoO3 oxide powders was dried in air and subjected to heat treatment in the temperature range of 600–800°C. After heat treatment, the products were identified by X-ray phase and sedimentation analysis. The specific surface area was measured using the Brunauer–Emmett–Teller static adsorption method. Porosity parameters were measured using the Barrett–Joyner–Halenda (BJH) method.Results. The Gibbs free energy ΔG of the reaction between chromium and molybdenum oxides was calculated and it was shown that the process is characterized by a significant negative value of ΔG. Concurrently, the Gibbs energy exhibits a relatively weak dependence on temperature. The highly dispersed chromium(III) molybdate powders with specific surface area of 15.3–29.7 m2·g−1 obtained in this way were pure according to X-ray diffraction analysis. A study of the volume, diameter, and pore size distribution was conducted through the utilization of nitrogen adsorption–desorption isotherms in accordance with the BJH model.Conclusions. It was demonstrated that Cr2(MoO4)3 powders possess a mesoporous structure and are distinguished by a bimodal pore system comprising small pores with a diameter of 2–3 nm and larger pores with a diameter ranging from 15 to 30 nm.https://www.finechem-mirea.ru/jour/article/view/2197solid-phase synthesispowderoxidechromiummolybdateporesspecific surface area |
| spellingShingle | M. N. Miroshnichenko V. N. Kolosov Highly dispersed chromium(III) molybdate powders obtained by solid phase synthesis Тонкие химические технологии solid-phase synthesis powder oxide chromium molybdate pores specific surface area |
| title | Highly dispersed chromium(III) molybdate powders obtained by solid phase synthesis |
| title_full | Highly dispersed chromium(III) molybdate powders obtained by solid phase synthesis |
| title_fullStr | Highly dispersed chromium(III) molybdate powders obtained by solid phase synthesis |
| title_full_unstemmed | Highly dispersed chromium(III) molybdate powders obtained by solid phase synthesis |
| title_short | Highly dispersed chromium(III) molybdate powders obtained by solid phase synthesis |
| title_sort | highly dispersed chromium iii molybdate powders obtained by solid phase synthesis |
| topic | solid-phase synthesis powder oxide chromium molybdate pores specific surface area |
| url | https://www.finechem-mirea.ru/jour/article/view/2197 |
| work_keys_str_mv | AT mnmiroshnichenko highlydispersedchromiumiiimolybdatepowdersobtainedbysolidphasesynthesis AT vnkolosov highlydispersedchromiumiiimolybdatepowdersobtainedbysolidphasesynthesis |