Green urea synthesis catalyzed by hematite nanowires in magnetic field
The catalytic activity of hematite (α-Fe2O3) nanowires under the influence of magnetic field on urea synthesis is considered green. The adsorption and subsequent dissociative reaction of hydrogen, nitrogen and carbon dioxide gases on the α-Fe2O3 (111) nanowires were investigated using the density fu...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Published: |
Elsevier B.V.
2017
|
| Online Access: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85008392028&doi=10.1016%2fj.jmmm.2016.12.005&partnerID=40&md5=ae3b6562d40828e4f9288ee03531d5e8 http://eprints.utp.edu.my/19532/ |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| id |
my.utp.eprints.19532 |
|---|---|
| record_format |
eprints |
| spelling |
my.utp.eprints.195322018-04-20T06:49:52Z Green urea synthesis catalyzed by hematite nanowires in magnetic field Yahya, N. Qureshi, S. Rehman, Z.U. Alqasem, B. Fai Kait, C. The catalytic activity of hematite (α-Fe2O3) nanowires under the influence of magnetic field on urea synthesis is considered green. The adsorption and subsequent dissociative reaction of hydrogen, nitrogen and carbon dioxide gases on the α-Fe2O3 (111) nanowires were investigated using the density functional theory (DFT) method. The average adsorption energy is −4.12 kcal/mole at different sites. The adsorption of gases resulted in a difference in density and net spin of electrons from 68 to 120 and 0–21 respectively. In addition, it induces magnetic moment value of 36.33 µB, which confirms the enhanced magnetic behaviour of hematite. α-Fe2O3 nanowires (NWs) synthesized by heating iron wire in a box furnace at (750−800) °C and as synthesized α-Fe2O3 nanoparticles (NPs) were received to use as a catalyst in the magnetic reaction of urea synthesis. X-ray Diffractometer (XRD) confirms the peaks of rhombohedral structure of α-Fe2O3 and Raman spectrum analyses confirms the α-Fe2O3 peaks at 410 cm−1, 500 cm−1 and 616 cm−1. The needle-like shape of hematite nanowires with length ranging from 16–25) μm and diameter from 74 to 145 nm confirmed by Field emission scanning electron microscopy (FESEM). The magnetic properties of the nanowires exhibited different levels of saturation magnetization, for α-Fe2O3 perpendicularly aligned direction (13.18 emu/g) and random direction (10.73 emu/g). Urea synthesis was done under magnetic field ranges from 0.0 to 2.5 T. The activation energy of α-Fe2O3 NWs for urea production is lower than NPs in the range of 0–1 T, whereas it is reversed for higher magnetic induction values. Fourier transform infrared spectroscopy (FTIR) confirmed the formation of urea at the peaks of 1690–1600 cm−1. This green urea employing magnetically induced method could be a contender to the Haber-Bosch process currently used by the current industry which utilizes high temperature and high pressure. © 2017 The Authors Elsevier B.V. 2017 Article PeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85008392028&doi=10.1016%2fj.jmmm.2016.12.005&partnerID=40&md5=ae3b6562d40828e4f9288ee03531d5e8 Yahya, N. and Qureshi, S. and Rehman, Z.U. and Alqasem, B. and Fai Kait, C. (2017) Green urea synthesis catalyzed by hematite nanowires in magnetic field. Journal of Magnetism and Magnetic Materials, 428 . pp. 469-480. http://eprints.utp.edu.my/19532/ |
| institution |
Universiti Teknologi Petronas |
| building |
UTP Resource Centre |
| collection |
Institutional Repository |
| continent |
Asia |
| country |
Malaysia |
| content_provider |
Universiti Teknologi Petronas |
| content_source |
UTP Institutional Repository |
| url_provider |
http://eprints.utp.edu.my/ |
| description |
The catalytic activity of hematite (α-Fe2O3) nanowires under the influence of magnetic field on urea synthesis is considered green. The adsorption and subsequent dissociative reaction of hydrogen, nitrogen and carbon dioxide gases on the α-Fe2O3 (111) nanowires were investigated using the density functional theory (DFT) method. The average adsorption energy is −4.12 kcal/mole at different sites. The adsorption of gases resulted in a difference in density and net spin of electrons from 68 to 120 and 0–21 respectively. In addition, it induces magnetic moment value of 36.33 µB, which confirms the enhanced magnetic behaviour of hematite. α-Fe2O3 nanowires (NWs) synthesized by heating iron wire in a box furnace at (750−800) °C and as synthesized α-Fe2O3 nanoparticles (NPs) were received to use as a catalyst in the magnetic reaction of urea synthesis. X-ray Diffractometer (XRD) confirms the peaks of rhombohedral structure of α-Fe2O3 and Raman spectrum analyses confirms the α-Fe2O3 peaks at 410 cm−1, 500 cm−1 and 616 cm−1. The needle-like shape of hematite nanowires with length ranging from 16–25) μm and diameter from 74 to 145 nm confirmed by Field emission scanning electron microscopy (FESEM). The magnetic properties of the nanowires exhibited different levels of saturation magnetization, for α-Fe2O3 perpendicularly aligned direction (13.18 emu/g) and random direction (10.73 emu/g). Urea synthesis was done under magnetic field ranges from 0.0 to 2.5 T. The activation energy of α-Fe2O3 NWs for urea production is lower than NPs in the range of 0–1 T, whereas it is reversed for higher magnetic induction values. Fourier transform infrared spectroscopy (FTIR) confirmed the formation of urea at the peaks of 1690–1600 cm−1. This green urea employing magnetically induced method could be a contender to the Haber-Bosch process currently used by the current industry which utilizes high temperature and high pressure. © 2017 The Authors |
| format |
Article |
| author |
Yahya, N. Qureshi, S. Rehman, Z.U. Alqasem, B. Fai Kait, C. |
| spellingShingle |
Yahya, N. Qureshi, S. Rehman, Z.U. Alqasem, B. Fai Kait, C. Green urea synthesis catalyzed by hematite nanowires in magnetic field |
| author_facet |
Yahya, N. Qureshi, S. Rehman, Z.U. Alqasem, B. Fai Kait, C. |
| author_sort |
Yahya, N. |
| title |
Green urea synthesis catalyzed by hematite nanowires in magnetic field |
| title_short |
Green urea synthesis catalyzed by hematite nanowires in magnetic field |
| title_full |
Green urea synthesis catalyzed by hematite nanowires in magnetic field |
| title_fullStr |
Green urea synthesis catalyzed by hematite nanowires in magnetic field |
| title_full_unstemmed |
Green urea synthesis catalyzed by hematite nanowires in magnetic field |
| title_sort |
green urea synthesis catalyzed by hematite nanowires in magnetic field |
| publisher |
Elsevier B.V. |
| publishDate |
2017 |
| url |
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85008392028&doi=10.1016%2fj.jmmm.2016.12.005&partnerID=40&md5=ae3b6562d40828e4f9288ee03531d5e8 http://eprints.utp.edu.my/19532/ |
| _version_ |
1738656083481722880 |
| score |
13.211869 |