A dissertation submitted to the Faculty of Science, University of the Witwatersrand,
Johannesburg, in fulfilment of the requirements of the degree of Master of Science.
November 1995. / The preparation of supported cobalt and gold catalysts by the technique of electroless
plating, and the establishment of the influence of synthesis variables on the physical
properties of the supported catalyst, forms the basis of this dissertation. In both the
cases of cobalt and gold supported on extruded cylindrical alumina pellets, the
penetration profile of the metal into the support showed dependence on the pH of the
activation solution, while the metal loading onto the same support showed no
dependence on pH of the activation solution at all.
The variables involved in the plating process of the activated pellets, namely: i) the
concentration of the activation solution, ii) pH and temperature of the plating bath, iii)
plating time, and Iv) variation of the concentrations of components of the plating bath
all influenced the mass of metal loaded onto the support, but not the penetration
characteristics. It is therefore possible to prepare a supported catalyst with very specific
,
properties using the above information.
Under similar conditions, with extruded alumina pellets as support and with the specific
plating formulations used, gold showed higher metal loadings at lower gold
concentrations than cobalt.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:wits/oai:wiredspace.wits.ac.za:10539/20619 |
| Date | 15 July 2016 |
| Creators | Beetge, Johannes Albertus |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | application/pdf |
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