000086823 001__ 86823
000086823 005__ 20200108151738.0
000086823 037__ $$aTAZ-TFM-2019-336
000086823 041__ $$aeng
000086823 1001_ $$aHenao Sierra, Wilson Albeiro
000086823 24200 $$aSynthesis and characterization of graphene related nanomaterials by catalytic decomposition of methane using transition metal catalysts
000086823 24500 $$aSíntesis y caracterización de nanomateriales relacionados con el grafeno mediante descomposición catalítica de metano utilizando catalizadores de metales de transición
000086823 260__ $$aZaragoza$$bUniversidad de Zaragoza$$c2019
000086823 506__ $$aby-nc-sa$$bCreative Commons$$c3.0$$uhttp://creativecommons.org/licenses/by-nc-sa/3.0/
000086823 520__ $$aThis work presents the selective synthesis of graphene-related nanomaterials and carbon nanotubes via catalytic decomposition of methane using carbon catalysts derived from cellulose (CDC) and impregnated with Co, Mn or Cu transition metals. The catalysts were prepared by reductive thermal decomposition of a commercial cellulose previously impregnated with the metallic precursors. The incorporation of Mn or Cu as metal promotors was found to direct the reaction towards the formation of a desired carbonaceous nanomaterial (CNM). Co-Mn/CDC catalyst was selective towards the production of graphene-related nanomaterials (few-layer graphene (FLG), graphite nanolayers and graphene nanoflakes) at reaction temperatures above 900 °C, whereas Co-Cu/CDC catalyst favored the formation of carbon nanotubes at temperatures below 850 °C. The influence of the operating conditions —reaction temperature and feed gas composition (%CH4:%H2)— on the quality and productivity of the obtained CNMs was evaluated by Raman spectroscopy and electron microscopy. The productivity and growth rate of CNMs were favored by increasing both the temperature and methane percentage on the feed. The maximum productivity reached by the Co-Mn/CDC catalyst was 0.48 gC/gcat∙h at 975 °C with a feed composition of 28.6%CH4:14.3%H2:57.1%N2. On the other hand, in the Co-Cu/CDC catalyst this productivity was 0.38 gC/gcat∙h at 750 °C using a feed composition of 42.9%CH4:14.3%H2:42.9%N2. The carbon growth evolution was further analyzed by a phenomenological kinetic model developed in previous works by the CREG-Catalysis, Molecular Separations & Reactor Engineering Group.<br />
000086823 521__ $$aMáster en Materiales Nanoestructurados para Aplicaciones Nanotecnológicas (Nanostructured Materials for Nanotechnology Applications)
000086823 540__ $$aDerechos regulados por licencia Creative Commons
000086823 700__ $$aMonzón Bescós, Antonio$$edir.
000086823 700__ $$aRomero Salazar, Eva María$$edir.
000086823 7102_ $$aUniversidad de Zaragoza$$bIngeniería Química y Tecnologías del Medio Ambiente$$cIngeniería Química
000086823 8560_ $$f792252@celes.unizar.es
000086823 8564_ $$s3420410$$uhttps://zaguan.unizar.es/record/86823/files/TAZ-TFM-2019-336.pdf$$yMemoria (eng)
000086823 909CO $$ooai:zaguan.unizar.es:86823$$pdriver$$ptrabajos-fin-master
000086823 950__ $$a
000086823 951__ $$adeposita:2020-01-08
000086823 980__ $$aTAZ$$bTFM$$cCIEN
000086823 999__ $$a20190628130144.CREATION_DATE