Influences of the various metal dopants for the nanosized vanadium phosphate catalysts
In this study, undoped and doped nanosized vanadium phosphate (VPO) catalysts were prepared by using hemihydrate precursor, VOHPO 4•0.5H2O. Various metal dopants were used (Zr, Zn, Ni, Nb, Mo, Mn, Fe, Cu, Cr, Ce and Co) in the synthesizing step in order to prepare doped nanosized VPO catalysts. The...
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| Format: | Article |
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Springer
2011
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| Online Access: | http://psasir.upm.edu.my/id/eprint/24627/ http://psasir.upm.edu.my/id/eprint/24627/1/Influences%20of%20the%20various%20metal%20dopants%20for%20the%20nanosized%20vanadium%20phosphate%20catalysts.pdf |
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| author | Yap, Taufiq Yun Hin Nawi @ Mohamed, Nurul Suziana Hussein, Mohd Zobir |
| author_facet | Yap, Taufiq Yun Hin Nawi @ Mohamed, Nurul Suziana Hussein, Mohd Zobir |
| author_sort | Yap, Taufiq Yun Hin |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | In this study, undoped and doped nanosized vanadium phosphate (VPO) catalysts were prepared by using hemihydrate precursor, VOHPO 4•0.5H2O. Various metal dopants were used (Zr, Zn, Ni, Nb, Mo, Mn, Fe, Cu, Cr, Ce and Co) in the synthesizing step in order to prepare doped nanosized VPO catalysts. The effect of metal dopants on nanosized VPO catalyst was studied through XRD, BET, redox titration, ICP-AES, SEM, TEM and H2-TPR. Catalytic evaluation of the undoped and doped VPO catalysts was also carried out on fixed-bed microreactor. Particle sizes for all the doped nanosized VPO catalysts were produced in nano-scale range. Besides, from the TPR results it has shown that the certain metal dopants also induced the amount of oxygen removed from the V4+ and V5+ peaks. This interesting effect eventually caused a significant improvement in n-butane conversion and maleic anhydride (MA) selectivity at higher and lower temperatures (673, 643 and 623 K). The MA selectivity of all the doped nanosized VPO at lower temperatures, are comparable to the undoped nanosized VPO catalyst at higher temperature, 673 K. Graphical Abstract: In this study, undoped and doped nanosized vanadium phosphate (VPO) catalysts were prepared by using hemihydrate precursor, VOHPO4•0.5H2O. Various metal dopants were used (Zr, Zn, Ni, Nb, Mo, Mn, Fe, Cu, Cr, Ce and Co) in the synthesizing step in order to prepare doped nanosized VPO catalysts. The effect of metal dopants on nanosized VPO catalyst was studied through XRD, BET, redox titration, ICP-AES, SEM, TEM and H2-TPR. Catalytic evaluation of the undoped and doped VPO catalysts was also carried out on fixed-bed microreactor. Particle sizes for all the doped nanosized VPO catalysts were produced in nano-scale range. Besides, from the TPR results it has shown that the certain metal dopants also induced the amount of oxygen removed from the V4+ and V5+ peaks. This interesting effect eventually caused a significant improvement in n-butane conversion and maleic anhydride (MA) selectivity at higher and lower temperatures (673, 643 and 623 K). The MA selectivity of all the doped nanosized VPO at lower temperatures, are comparable to the undoped nanosized VPO catalyst at higher temperature, 673 K. |
| first_indexed | 2025-11-15T08:41:15Z |
| format | Article |
| id | upm-24627 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T08:41:15Z |
| publishDate | 2011 |
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| spelling | upm-246272016-11-25T04:04:12Z http://psasir.upm.edu.my/id/eprint/24627/ Influences of the various metal dopants for the nanosized vanadium phosphate catalysts Yap, Taufiq Yun Hin Nawi @ Mohamed, Nurul Suziana Hussein, Mohd Zobir In this study, undoped and doped nanosized vanadium phosphate (VPO) catalysts were prepared by using hemihydrate precursor, VOHPO 4•0.5H2O. Various metal dopants were used (Zr, Zn, Ni, Nb, Mo, Mn, Fe, Cu, Cr, Ce and Co) in the synthesizing step in order to prepare doped nanosized VPO catalysts. The effect of metal dopants on nanosized VPO catalyst was studied through XRD, BET, redox titration, ICP-AES, SEM, TEM and H2-TPR. Catalytic evaluation of the undoped and doped VPO catalysts was also carried out on fixed-bed microreactor. Particle sizes for all the doped nanosized VPO catalysts were produced in nano-scale range. Besides, from the TPR results it has shown that the certain metal dopants also induced the amount of oxygen removed from the V4+ and V5+ peaks. This interesting effect eventually caused a significant improvement in n-butane conversion and maleic anhydride (MA) selectivity at higher and lower temperatures (673, 643 and 623 K). The MA selectivity of all the doped nanosized VPO at lower temperatures, are comparable to the undoped nanosized VPO catalyst at higher temperature, 673 K. Graphical Abstract: In this study, undoped and doped nanosized vanadium phosphate (VPO) catalysts were prepared by using hemihydrate precursor, VOHPO4•0.5H2O. Various metal dopants were used (Zr, Zn, Ni, Nb, Mo, Mn, Fe, Cu, Cr, Ce and Co) in the synthesizing step in order to prepare doped nanosized VPO catalysts. The effect of metal dopants on nanosized VPO catalyst was studied through XRD, BET, redox titration, ICP-AES, SEM, TEM and H2-TPR. Catalytic evaluation of the undoped and doped VPO catalysts was also carried out on fixed-bed microreactor. Particle sizes for all the doped nanosized VPO catalysts were produced in nano-scale range. Besides, from the TPR results it has shown that the certain metal dopants also induced the amount of oxygen removed from the V4+ and V5+ peaks. This interesting effect eventually caused a significant improvement in n-butane conversion and maleic anhydride (MA) selectivity at higher and lower temperatures (673, 643 and 623 K). The MA selectivity of all the doped nanosized VPO at lower temperatures, are comparable to the undoped nanosized VPO catalyst at higher temperature, 673 K. Springer 2011-01 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/24627/1/Influences%20of%20the%20various%20metal%20dopants%20for%20the%20nanosized%20vanadium%20phosphate%20catalysts.pdf Yap, Taufiq Yun Hin and Nawi @ Mohamed, Nurul Suziana and Hussein, Mohd Zobir (2011) Influences of the various metal dopants for the nanosized vanadium phosphate catalysts. Catalysis Letters, 141 (1). pp. 136-148. ISSN 1011-372X; ESSN: 1572-879X http://rd.springer.com/article/10.1007%2Fs10562-010-0469-y 10.1007/s10562-010-0469-y |
| spellingShingle | Yap, Taufiq Yun Hin Nawi @ Mohamed, Nurul Suziana Hussein, Mohd Zobir Influences of the various metal dopants for the nanosized vanadium phosphate catalysts |
| title | Influences of the various metal dopants for the nanosized vanadium phosphate catalysts |
| title_full | Influences of the various metal dopants for the nanosized vanadium phosphate catalysts |
| title_fullStr | Influences of the various metal dopants for the nanosized vanadium phosphate catalysts |
| title_full_unstemmed | Influences of the various metal dopants for the nanosized vanadium phosphate catalysts |
| title_short | Influences of the various metal dopants for the nanosized vanadium phosphate catalysts |
| title_sort | influences of the various metal dopants for the nanosized vanadium phosphate catalysts |
| url | http://psasir.upm.edu.my/id/eprint/24627/ http://psasir.upm.edu.my/id/eprint/24627/ http://psasir.upm.edu.my/id/eprint/24627/ http://psasir.upm.edu.my/id/eprint/24627/1/Influences%20of%20the%20various%20metal%20dopants%20for%20the%20nanosized%20vanadium%20phosphate%20catalysts.pdf |