To the question of oxidation on the surface of oxides: temperature- programmed oxidation of cyclohexanol
Temperature-programmed reaction (TPR) method with mass spectrometric control of the products was used to study of cyclohexanol oxidation into cyclohexanone on individual and mixed oxides supported by γ-Al2O3 and silica gel. In the TPR profiles the temperature of a maximum r...
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| Date: | 2022 |
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| Format: | Article |
| Language: | English |
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V.P. Kukhar Institute of Bioorganic Chemistry and Petrochemistry of the National Academy of Sciences of Ukraine
2022
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| Online Access: | https://kataliz.org.ua/index.php/journal/article/view/76 |
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| Journal Title: | Catalysis and petrochemistry |
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Catalysis and petrochemistry| _version_ | 1859471922420514816 |
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| author | Brei, Volodymyr V. Levytska, Svitlana I. Prudius, Svitlana V. |
| author_facet | Brei, Volodymyr V. Levytska, Svitlana I. Prudius, Svitlana V. |
| author_sort | Brei, Volodymyr V. |
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| collection | OJS |
| datestamp_date | 2023-01-20T09:37:29Z |
| description | Temperature-programmed reaction (TPR) method with mass spectrometric control of the products was used to study of cyclohexanol oxidation into cyclohexanone on individual and mixed oxides supported by γ-Al2O3 and silica gel. In the TPR profiles the temperature of a maximum rate of cyclohexanone formation varies from 125°C for MoO3/Al2O3 to 235°C for less active CuO/Al2O3. The catalytic activity of individual oxides decreases in the order MoO3/Al2O3> V2O5/SiO2 > Fe2O3/Al2O3 > Bi2O5/Al2O3 > TiO2/SiO2 ≈ СeO2/Al2O3 > TiO2/Al2O3 > SnO2/Al2O3. As "reactive" oxygen in our TPR experiment was supplied only from oxide lattice, oxide activity is determined by different energy of the surface Me – O bonds. The approach to search for mixed active oxides based on decreasing coordination number of O2- ions is proposed, that confirmed by the example of CuO-WO3/Al2O3 catalyst. The mixed supported oxides, especially CuOCrO3/Al2O3, CuO-MoO3/Al2O3, MoO3-SnO2/Al2O3 and Bi2O3–SnO2/Al2O3, are more active in С6Н12О + 1/2О2 → С6Н10О + Н2О oxidation. The synthesized CuO-CrO3/Al2O3 catalyst provides cyclohexanone formation without side   cyclohexanol dehydration and can be used for the oxidation of ethylene glycol – methanol mixture into methyl glycolate. CuO-Cr2O3/Al2O3 with a spinel structure of CuCr2O4 ([CuO4] 6− tetrahedra, Cu2+ sp3-hybridization) is more active in cyclohexanol oxidation than CuO/Al2O3 with flat [CuO4] 6−squares, Cu2+ dsp2-hybridization. This is explained by the lower energy of Cu-O bonds at sp3-hybridization of Cu2+ ions. |
| first_indexed | 2026-03-12T15:50:14Z |
| format | Article |
| id | oai:katalizorgua:article-76 |
| institution | Catalysis and petrochemistry |
| keywords_txt_mv | keywords |
| language | English |
| last_indexed | 2026-03-12T15:50:14Z |
| publishDate | 2022 |
| publisher | V.P. Kukhar Institute of Bioorganic Chemistry and Petrochemistry of the National Academy of Sciences of Ukraine |
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| spelling | oai:katalizorgua:article-762023-01-20T09:37:29Z To the question of oxidation on the surface of oxides: temperature- programmed oxidation of cyclohexanol To the question of oxidation on the surface of oxides: temperature- programmed oxidation of cyclohexanol Brei, Volodymyr V. Levytska, Svitlana I. Prudius, Svitlana V. heterogeneous catalysis, oxidation on oxides, supported catalysts, mixed oxides гетерогенний каталіз, окиснення на оксидах, нанесені каталізатори, змішані оксиди Temperature-programmed reaction (TPR) method with mass spectrometric control of the products was used to study of cyclohexanol oxidation into cyclohexanone on individual and mixed oxides supported by γ-Al2O3 and silica gel. In the TPR profiles the temperature of a maximum rate of cyclohexanone formation varies from 125°C for MoO3/Al2O3 to 235°C for less active CuO/Al2O3. The catalytic activity of individual oxides decreases in the order MoO3/Al2O3> V2O5/SiO2 > Fe2O3/Al2O3 > Bi2O5/Al2O3 > TiO2/SiO2 ≈ СeO2/Al2O3 > TiO2/Al2O3 > SnO2/Al2O3. As "reactive" oxygen in our TPR experiment was supplied only from oxide lattice, oxide activity is determined by different energy of the surface Me – O bonds. The approach to search for mixed active oxides based on decreasing coordination number of O2- ions is proposed, that confirmed by the example of CuO-WO3/Al2O3 catalyst. The mixed supported oxides, especially CuOCrO3/Al2O3, CuO-MoO3/Al2O3, MoO3-SnO2/Al2O3 and Bi2O3–SnO2/Al2O3, are more active in С6Н12О + 1/2О2 → С6Н10О + Н2О oxidation. The synthesized CuO-CrO3/Al2O3 catalyst provides cyclohexanone formation without side   cyclohexanol dehydration and can be used for the oxidation of ethylene glycol – methanol mixture into methyl glycolate. CuO-Cr2O3/Al2O3 with a spinel structure of CuCr2O4 ([CuO4] 6− tetrahedra, Cu2+ sp3-hybridization) is more active in cyclohexanol oxidation than CuO/Al2O3 with flat [CuO4] 6−squares, Cu2+ dsp2-hybridization. This is explained by the lower energy of Cu-O bonds at sp3-hybridization of Cu2+ ions. Temperature-programmed reaction (TPR) method with mass spectrometric control of the products was used to study of cyclohexanol oxidation into cyclohexanone on individual and mixed oxides supported by γ-Al2O3 and silica gel. In the TPR profiles the temperature of a maximum rate of cyclohexanone formation varies from 125°C for MoO3/Al2O3 to 235°C for less active CuO/Al2O3. The catalytic activity of individual oxides decreases in the order MoO3/Al2O3> V2O5/SiO2 > Fe2O3/Al2O3 > Bi2O5/Al2O3 > TiO2/SiO2 ≈ СeO2/Al2O3 > TiO2/Al2O3 > SnO2/Al2O3. As "reactive" oxygen in our TPR experiment was supplied only from oxide lattice, oxide activity is determined by different energy of the surface Me – O bonds. The approach to search for mixed active oxides based on decreasing coordination number of O2- ions is proposed, that confirmed by the example of CuO-WO3/Al2O3 catalyst. The mixed supported oxides, especially CuOCrO3/Al2O3, CuO-MoO3/Al2O3, MoO3-SnO2/Al2O3 and Bi2O3–SnO2/Al2O3, are more active in С6Н12О + 1/2О2 → С6Н10О + Н2О oxidation. The synthesized CuO-CrO3/Al2O3 catalyst provides cyclohexanone formation without side   cyclohexanol dehydration and can be used for the oxidation of ethylene glycol – methanol mixture into methyl glycolate. CuO-Cr2O3/Al2O3 with a spinel structure of CuCr2O4 ([CuO4] 6− tetrahedra, Cu2+ sp3-hybridization) is more active in cyclohexanol oxidation than CuO/Al2O3 with flat [CuO4] 6−squares, Cu2+ dsp2-hybridization. This is explained by the lower energy of Cu-O bonds at sp3-hybridization of Cu2+ ions. V.P. Kukhar Institute of Bioorganic Chemistry and Petrochemistry of the National Academy of Sciences of Ukraine 2022-10-26 Article Article application/pdf https://kataliz.org.ua/index.php/journal/article/view/76 10.15407/kataliz2022.33.001 Catalysis and petrochemistry; No. 33 (2022): Catalysis and petrochemistry; 1-9 Каталіз та нафтохімія; № 33 (2022): Каталіз та нафтохімія; 1-9 2707-5796 2412-4176 10.15407/kataliz2022.33 en https://kataliz.org.ua/index.php/journal/article/view/76/77 Copyright (c) 2022 Catalysis and petrochemistry |
| spellingShingle | гетерогенний каталіз окиснення на оксидах нанесені каталізатори змішані оксиди Brei, Volodymyr V. Levytska, Svitlana I. Prudius, Svitlana V. To the question of oxidation on the surface of oxides: temperature- programmed oxidation of cyclohexanol |
| title | To the question of oxidation on the surface of oxides: temperature- programmed oxidation of cyclohexanol |
| title_alt | To the question of oxidation on the surface of oxides: temperature- programmed oxidation of cyclohexanol |
| title_full | To the question of oxidation on the surface of oxides: temperature- programmed oxidation of cyclohexanol |
| title_fullStr | To the question of oxidation on the surface of oxides: temperature- programmed oxidation of cyclohexanol |
| title_full_unstemmed | To the question of oxidation on the surface of oxides: temperature- programmed oxidation of cyclohexanol |
| title_short | To the question of oxidation on the surface of oxides: temperature- programmed oxidation of cyclohexanol |
| title_sort | to the question of oxidation on the surface of oxides: temperature- programmed oxidation of cyclohexanol |
| topic | гетерогенний каталіз окиснення на оксидах нанесені каталізатори змішані оксиди |
| topic_facet | heterogeneous catalysis oxidation on oxides supported catalysts mixed oxides гетерогенний каталіз окиснення на оксидах нанесені каталізатори змішані оксиди |
| url | https://kataliz.org.ua/index.php/journal/article/view/76 |
| work_keys_str_mv | AT breivolodymyrv tothequestionofoxidationonthesurfaceofoxidestemperatureprogrammedoxidationofcyclohexanol AT levytskasvitlanai tothequestionofoxidationonthesurfaceofoxidestemperatureprogrammedoxidationofcyclohexanol AT prudiussvitlanav tothequestionofoxidationonthesurfaceofoxidestemperatureprogrammedoxidationofcyclohexanol |