3.1.6. ICP-OES

The metal content of each catalyst was detected using ICP-OES analysis (Perkin Elmer, Optima 5300DV). Table 1 indicates the analysis result for the catalysts. In all samples, as shown in the Table, the real metal contents were slightly lower than the calculated extent. The variant between the calculated and real extent of zinc metal on the silica support was between 8%–15%. The calculated variant was mainly because of the impurity of the Zn as the error percentages elevated with the increase in the doped percentages of the impregnated catalysts.
