Synthesis and Characterisation Properties of Some Impregnated Mono and Bimetallic Copper and Silver Catalysts.

L. Leke, S. Olawuyi, R. E. Kukwa, A. T. Tyowua, S. O. Adejo


Metal loading for supported catalysts has a pronounced effect on the surface nature of the catalysts formed. 1wt % monometallics and bimetallics of copper and silver on both alumina and silica supports were prepared by impregnation. Characterisation was performed on the samples produced by surface analyses (nitrogen adsorption and porosity measurements) XRD, and TPR. BET measurement showed surface areas of the alumina supported samples to reduce from 105 to 97 m2g-1 from the pure alumina to the bimetallic supported respectively while the silica supported reduced from 247- 239 m2g-1 for the pure silica to the silver supported respectively. Pore volume and diameters also reduced with loading of the various metals on the supports. The XRD indicated no crystalline phases of the loaded metals to be present for the 1wt % catalysts, instead, the characteristics diffraction features of the supports employed were indicated, which is likely as a result of a good dispersion within the good surface areas supports. However, for a 5wt % sample, there were some diffraction patterns of the loaded metals indicated. Reduction peaks from TPR also revealed the presence of partially oxidised and dispersed metal atoms typical of reflexions at around 267 ºC with shoulder at 297 ºC (well dispersed Cu) while reflexions at around 111, 160 240 and 293 ºC were indicated for small-sized AgO and Ag2O clusters inside the pores of the supports. 

Keywords: monometallic, bimetallic, metal loading, impregnation, catalyst.

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