Synthesis of Cobalt Nano Particles on Silica Support using Strong Electrostatic Adsorption (SEA) Method

Chee, Kai Ling and Mohd Zabidi, N. A. and Mohan, chandra (2010) Synthesis of Cobalt Nano Particles on Silica Support using Strong Electrostatic Adsorption (SEA) Method. In: 6th International Conference on Diffusion in Solids and Liquids, 5-7th July 2010, Paris.

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Supported cobalt is one of the common catalysts used in Fischer-Tropsch synthesis (FTS). Strong electrostatic adsorption (SEA) was employed to synthesize cobalt nano particles supported on silica. Cobalt nitrate was used as the catalyst precursor and non-porous silica spheres, which were synthesized using the modified Stöber method, were used as a catalyst support. Point of zero charge (PZC) for silica was determined using equilibrium pH at high oxide loading (EpHL) method. The optimum pH was determined by measuring cobalt uptake versus pH. High cobalt uptake at basic pH and low cobalt uptake at acidic pH indicates electrostatic interaction between the cobalt complexes in the precursor solution and the hydroxyl group on the support’s surface. Catalysts prepared at optimum pH were characterized using TPR, XPS and TEM. TPR shows reduction peak at high temperature (587°C) indicating strong interaction between cobalt and silica support. XPS shows presence of Co2+ species on the surface. TEM images of the Co/SiO2 at 5 wt% and 10 wt% cobalt loadings show fairly well-dispersed cobalt oxide nano particles on the spherical silica support with narrow particle size distribution. The findings suggest that SEA was deemed a suitable method to prepare supported cobalt catalysts.

Item Type:Conference or Workshop Item (Paper)
Subjects:Q Science > QD Chemistry
Departments / MOR / COE:Research Institutes > Institute for Autonomous Systems
ID Code:4723
Deposited By: Assoc Prof Dr Noor Asmawati Mohd Zabidi
Deposited On:23 Mar 2011 03:23
Last Modified:01 Apr 2014 06:25

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