| Title of Article |
Formation of iron active species on HZSM-5 catalyst by varying iron precursors for phenol hydroxylation |
| Date of Acceptance |
19 September 2018 |
| Journal |
| Title of Journal |
Molecular Catalysis |
| Standard |
ISI |
| Institute of Journal |
ELSEVIER |
| ISBN/ISSN |
2468-8231 |
| Volume |
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| Issue |
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| Month |
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| Year of Publication |
2018 |
| Page |
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| Abstract |
Iron-containing HZSM-5 zeolite (Fen+-HZSM-5) are performed by ion exchange with varying iron precursors of Fe2+, Fe3+ and equivalent molar of Fe2+/Fe3+. Variation of the iron species on the HZSM-5 surface is expected. All Fen+-HZSM-5 catalysts are applied for phenol hydroxylation in reflux condition at 70 °C in the presence of H2O2. Discrimination in the iron structures on the catalysts is determined using UV-Vis DRS and EXAFS techniques. The iron species found in the Fe2+-HZSM-5 and Fe3+-HZSM-5 catalysts is an isolated Fe3+ species in tetrahedral geometry indicating the presence of iron in zeolite framework (Fe-OF). While a mixture of isolated Fe3+ and iron-dioxo species (FO-Fe-OF) in octahedral geometry existing in small particles on the HZSM-5 is determined in the Fe2+/Fe3+-HZSM-5 catalyst. The presence of iron mixture in the Fe2+/Fe3+-HZSM-5 catalyst showed the highest turnover number (TON) for phenol hydroxylation comparing with bulk α-Fe2O3 and α-FeOOH catalysts. Moreover, an improvement of catechol selectivity by the existence iron-dioxo species on HZSM-5 catalyst is proposed. |
| Keyword |
HZSM-5; α-Fe2O3; α-FeOOH; EXAFS; phenol hydroxylation |
| Author |
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| Reviewing Status |
มีผู้ประเมินอิสระ |
| Status |
ได้รับการตอบรับให้ตีพิมพ์ |
| Level of Publication |
นานาชาติ |
| citation |
false |
| Part of thesis |
true |
| Attach file |
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| Citation |
0
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Publication
Journal Publication
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