Preparation of α-MoO3 from H3PMo12O40 precursor: synthesis of 1,2-cyclohexanediol from cyclohexene over α-MoO3-TiO2 catalyst
A series of α -MoO _3 -TiO _2 mixed oxides were prepared by calcining a mixture of the heteropolyacid H _3 PMo _12 O _40 and TiO _2 at temperatures ranging from 350 °C to 600 °C. The mixed oxides thus prepared were characterized and tested for the oxidation of cyclohexene by the oxidizing mixture H...
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IOP Publishing
2022-01-01
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| Series: | Materials Research Express |
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| Online Access: | https://doi.org/10.1088/2053-1591/ac8a3d |
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| author | Tahani Saad AlGarni Naaser A Y Abduh Abdullah Al Kahtani Ahmed Aouissi |
| author_facet | Tahani Saad AlGarni Naaser A Y Abduh Abdullah Al Kahtani Ahmed Aouissi |
| author_sort | Tahani Saad AlGarni |
| collection | DOAJ |
| description | A series of α -MoO _3 -TiO _2 mixed oxides were prepared by calcining a mixture of the heteropolyacid H _3 PMo _12 O _40 and TiO _2 at temperatures ranging from 350 °C to 600 °C. The mixed oxides thus prepared were characterized and tested for the oxidation of cyclohexene by the oxidizing mixture H _2 O _2 /CO _2 . FTIR and XRD characterizations showed that the Keggin structure of H _3 PMo _12 O _40 was preserved for calcination temperatures below 400 °C. Above 450 °C, Keggin’s structure collapses. XRD analysis revealed that as the calcination temperature increased, more orthorhombic α -MoO _3 was formed. Analysis of the reaction mixture by GC-MS showed that oxidation by the H _2 O _2 /CO _2 mixture leads to 1,2-cyclohexanediol as the main product and to 2-cyclohexene-1-one and 2-cyclohexene-1-ol as minor products. Oxidation by H _2 O _2 /CO _2 mixture proved to be more effective than H _2 O _2 alone and CO _2 alone. The conversion (69.4%) and the 1,2-cyclohexanediol selectivity (93.2%) obtained over α -MoO _3 -TiO _2 mixed oxides, higher than that obtained with TiO _2 monoxide and α -MoO _3 monoxide, suggest a synergistic effect between TiO _2 and α -MoO _3 . This efficient and stable catalyst after reuse can be developed for the synthesis of diols. |
| first_indexed | 2024-03-12T15:35:48Z |
| format | Article |
| id | doaj.art-d5c6214050d5452bb50518c0a55e3c6a |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:35:48Z |
| publishDate | 2022-01-01 |
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| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-d5c6214050d5452bb50518c0a55e3c6a2023-08-09T16:16:20ZengIOP PublishingMaterials Research Express2053-15912022-01-019808500310.1088/2053-1591/ac8a3dPreparation of α-MoO3 from H3PMo12O40 precursor: synthesis of 1,2-cyclohexanediol from cyclohexene over α-MoO3-TiO2 catalystTahani Saad AlGarni0Naaser A Y Abduh1Abdullah Al Kahtani2Ahmed Aouissi3https://orcid.org/0000-0001-9035-8660Chemistry Department, College of Science, King Saud University , Riyadh, Saudi ArabiaChemistry Department, College of Science, King Saud University , Riyadh, Saudi ArabiaChemistry Department, College of Science, King Saud University , Riyadh, Saudi ArabiaChemistry Department, College of Science, King Saud University , Riyadh, Saudi ArabiaA series of α -MoO _3 -TiO _2 mixed oxides were prepared by calcining a mixture of the heteropolyacid H _3 PMo _12 O _40 and TiO _2 at temperatures ranging from 350 °C to 600 °C. The mixed oxides thus prepared were characterized and tested for the oxidation of cyclohexene by the oxidizing mixture H _2 O _2 /CO _2 . FTIR and XRD characterizations showed that the Keggin structure of H _3 PMo _12 O _40 was preserved for calcination temperatures below 400 °C. Above 450 °C, Keggin’s structure collapses. XRD analysis revealed that as the calcination temperature increased, more orthorhombic α -MoO _3 was formed. Analysis of the reaction mixture by GC-MS showed that oxidation by the H _2 O _2 /CO _2 mixture leads to 1,2-cyclohexanediol as the main product and to 2-cyclohexene-1-one and 2-cyclohexene-1-ol as minor products. Oxidation by H _2 O _2 /CO _2 mixture proved to be more effective than H _2 O _2 alone and CO _2 alone. The conversion (69.4%) and the 1,2-cyclohexanediol selectivity (93.2%) obtained over α -MoO _3 -TiO _2 mixed oxides, higher than that obtained with TiO _2 monoxide and α -MoO _3 monoxide, suggest a synergistic effect between TiO _2 and α -MoO _3 . This efficient and stable catalyst after reuse can be developed for the synthesis of diols.https://doi.org/10.1088/2053-1591/ac8a3ddiolcyclohexene dihydroxylationcarbon dioxidehydrogen peroxideα-MoO3 |
| spellingShingle | Tahani Saad AlGarni Naaser A Y Abduh Abdullah Al Kahtani Ahmed Aouissi Preparation of α-MoO3 from H3PMo12O40 precursor: synthesis of 1,2-cyclohexanediol from cyclohexene over α-MoO3-TiO2 catalyst Materials Research Express diol cyclohexene dihydroxylation carbon dioxide hydrogen peroxide α-MoO3 |
| title | Preparation of α-MoO3 from H3PMo12O40 precursor: synthesis of 1,2-cyclohexanediol from cyclohexene over α-MoO3-TiO2 catalyst |
| title_full | Preparation of α-MoO3 from H3PMo12O40 precursor: synthesis of 1,2-cyclohexanediol from cyclohexene over α-MoO3-TiO2 catalyst |
| title_fullStr | Preparation of α-MoO3 from H3PMo12O40 precursor: synthesis of 1,2-cyclohexanediol from cyclohexene over α-MoO3-TiO2 catalyst |
| title_full_unstemmed | Preparation of α-MoO3 from H3PMo12O40 precursor: synthesis of 1,2-cyclohexanediol from cyclohexene over α-MoO3-TiO2 catalyst |
| title_short | Preparation of α-MoO3 from H3PMo12O40 precursor: synthesis of 1,2-cyclohexanediol from cyclohexene over α-MoO3-TiO2 catalyst |
| title_sort | preparation of α moo3 from h3pmo12o40 precursor synthesis of 1 2 cyclohexanediol from cyclohexene over α moo3 tio2 catalyst |
| topic | diol cyclohexene dihydroxylation carbon dioxide hydrogen peroxide α-MoO3 |
| url | https://doi.org/10.1088/2053-1591/ac8a3d |
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