Synthesis and ammonolysis of nickel and cobalt tungstates and their characterisation
The synthesis and characterization of NiW and CoW compounds are herein reported. The NiWO4 and CoWO4 samples, successfully synthesised by the hydrothermal method, were treated under NH3 to obtain the metal nitride. The SEM micrographs show that this transformation is a topotactic process. Tungsten t...
| Published in: | Journal of Saudi Chemical Society |
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| Main Authors: | , , , , , , |
| Format: | Article |
| Language: | English |
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Springer
2016-07-01
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1319610312001378 |
| _version_ | 1848651604368031744 |
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| author | J.L. Rico M. Albiter J. Espino J.S.J. Hargreaves M. Ostroumov L.I. Salcedo K. Wilson |
| author_facet | J.L. Rico M. Albiter J. Espino J.S.J. Hargreaves M. Ostroumov L.I. Salcedo K. Wilson |
| author_sort | J.L. Rico |
| collection | DOAJ |
| container_title | Journal of Saudi Chemical Society |
| description | The synthesis and characterization of NiW and CoW compounds are herein reported. The NiWO4 and CoWO4 samples, successfully synthesised by the hydrothermal method, were treated under NH3 to obtain the metal nitride. The SEM micrographs show that this transformation is a topotactic process. Tungsten trioxide was also treated under NH3 at similar operating conditions, and used as a reference. High nitrogen contents after ammonolysis were calculated, however, the percentages were below the theoretical values assuming the formation of pure NiWN, CoWN and WN. The XRD pattern indicates that WON is likely formed after ammonolysis of tungsten oxide whereas phase segregation was observed on the nickel and cobalt samples. Furthermore, the reactivity of the nitride samples as function of temperature was measured under argon and the results show that most of the nitrogen is removed from the cobalt and nickel samples whereas it was partially released from the tungsten specimen. |
| format | Article |
| id | doaj-e2f6cf390cda44da89be4e412b64f0e6 |
| institution | Directory of Open Access Journals |
| issn | 1319-6103 |
| language | English |
| publishDate | 2016-07-01 |
| publisher | Springer |
| record_format | Article |
| spelling | doaj-e2f6cf390cda44da89be4e412b64f0e62025-11-03T00:24:22ZengSpringerJournal of Saudi Chemical Society1319-61032016-07-0120440541010.1016/j.jscs.2012.09.005Synthesis and ammonolysis of nickel and cobalt tungstates and their characterisationJ.L. Rico0M. Albiter1J. Espino2J.S.J. Hargreaves3M. Ostroumov4L.I. Salcedo5K. Wilson6Laboratorio de Catálisis, Facultad de Ingeniería Química, Universidad Michoacana de San Nicolás de Hidalgo, Edificio V1, CU, Morelia Mich, C.P. 58060, MexicoLaboratorio de Catálisis, Facultad de Ingeniería Química, Universidad Michoacana de San Nicolás de Hidalgo, Edificio V1, CU, Morelia Mich, C.P. 58060, MexicoLaboratorio de Catálisis, Facultad de Ingeniería Química, Universidad Michoacana de San Nicolás de Hidalgo, Edificio V1, CU, Morelia Mich, C.P. 58060, MexicoWestCHEM, School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow G12 8QQ, UKInstituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo, Edificio U, CU, Morelia Mich, C.P. 58060, MexicoLaboratorio de Catálisis, Facultad de Ingeniería Química, Universidad Michoacana de San Nicolás de Hidalgo, Edificio V1, CU, Morelia Mich, C.P. 58060, MexicoWestCHEM, School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow G12 8QQ, UKThe synthesis and characterization of NiW and CoW compounds are herein reported. The NiWO4 and CoWO4 samples, successfully synthesised by the hydrothermal method, were treated under NH3 to obtain the metal nitride. The SEM micrographs show that this transformation is a topotactic process. Tungsten trioxide was also treated under NH3 at similar operating conditions, and used as a reference. High nitrogen contents after ammonolysis were calculated, however, the percentages were below the theoretical values assuming the formation of pure NiWN, CoWN and WN. The XRD pattern indicates that WON is likely formed after ammonolysis of tungsten oxide whereas phase segregation was observed on the nickel and cobalt samples. Furthermore, the reactivity of the nitride samples as function of temperature was measured under argon and the results show that most of the nitrogen is removed from the cobalt and nickel samples whereas it was partially released from the tungsten specimen.http://www.sciencedirect.com/science/article/pii/S1319610312001378NitridationMetal oxides and nitrides |
| spellingShingle | J.L. Rico M. Albiter J. Espino J.S.J. Hargreaves M. Ostroumov L.I. Salcedo K. Wilson Synthesis and ammonolysis of nickel and cobalt tungstates and their characterisation Nitridation Metal oxides and nitrides |
| title | Synthesis and ammonolysis of nickel and cobalt tungstates and their characterisation |
| title_full | Synthesis and ammonolysis of nickel and cobalt tungstates and their characterisation |
| title_fullStr | Synthesis and ammonolysis of nickel and cobalt tungstates and their characterisation |
| title_full_unstemmed | Synthesis and ammonolysis of nickel and cobalt tungstates and their characterisation |
| title_short | Synthesis and ammonolysis of nickel and cobalt tungstates and their characterisation |
| title_sort | synthesis and ammonolysis of nickel and cobalt tungstates and their characterisation |
| topic | Nitridation Metal oxides and nitrides |
| url | http://www.sciencedirect.com/science/article/pii/S1319610312001378 |
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