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The preparation of molybdenum carbonitrides by single source routes and a study of their lattice reactivity

Al shalwi, Matar (2012) The preparation of molybdenum carbonitrides by single source routes and a study of their lattice reactivity. MSc(R) thesis, University of Glasgow.

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Abstract

Thermal decomposition of hexamethylenetetramine molybdate and ethylenediammonium molybdate were studied using a temperature programmed reaction procedure under different reaction atmospheres. The obtained materials were characterised by X-ray diffraction (XRD), surface area measurement (BET), scanning electron microscopy (SEM), elemental analysis (CHN), thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS). The results indicated that the decomposition of both precursors under H2/N2 in a ratio of 3:1 or 1:3 leads to production of molybdenum carbide, and also a mixture of molybdenum metal and molybdenum carbide is obtained from the thermal decomposition of both precursors under 1:3 Ar/H2. In contrast, the decomposition of hexamethylenetetramine molybdate under N2 or Ar leads to production of Ɣ-Mo2N, whereas impure phases were obtained from the decomposition of ethylenediammonium molybdate where molybdenum carbide, molybdenum metal and molybdenum oxide were obtained under an Ar atmosphere while gamma molybdenum nitride, molybdenum carbide and molybdenum oxide were obtained under a N2 atmosphere. In order to characterise the reactivity of the lattice carbon and nitrogen species within the obtained materials various techniques have been applied. The results have indicated that nitrogen is much more reactive than carbon and the nature of its reactivity is influenced by composition. The difference in reactivity observed indicates that molybdenum carbonitrides are not suitable candidates as reagents for which the simultaneous loss of nitrogen and carbon from the lattice would be desirable.

Item Type: Thesis (MSc(R))
Qualification Level: Masters
Keywords: molybdenum oxycarbonitride
Subjects: Q Science > QD Chemistry
Q Science > Q Science (General)
Colleges/Schools: College of Science and Engineering > School of Chemistry
Supervisor's Name: Hargreaves, Dr. Justin
Date of Award: 2012
Depositing User: Mr matar alshalwi
Unique ID: glathesis:2012-3346
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 16 May 2012
Last Modified: 10 Dec 2012 14:06
URI: http://theses.gla.ac.uk/id/eprint/3346

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