Antimony distribution ratios

Table IV - Distribution Ratios of Arsenic, Antimony and Copper...

The optimum proportion of antimony trioxide corresponds to a halogen to antimony molar ratio of 3 1. Effective flame-retardance is achieved only by fine-particle additives in homogeneous distribution. 

Under the reaction conditions used, a U3O8 catalyst demonstrated appreciable selective oxidation activity. The best results, in terms of both activity and selectivity to benzaldehyde, were obtained with the mixed oxides with U Mo atomic ratios in the range 8 2 to 9 1. The maximum yield of benzaldehyde was 40 mol%. On the other hand, antimony-based uranium oxides were not found to be effective as catalyst for this reaction. U—Mo and Bi—Mo mixtures also exhibited promising activity and selectivity to benzaldehyde. Bi—Mo and Bi—Mo—P—Si catalysts were also tested. Qualitahvely there was little difference between the product distributions from the two catalysts. The major products formed were benzaldehyde, benzene and carbon oxides, as well as traces of anthraquinone and benzoic acid. 

The average trace-element concentrations of seven xtl MMs from the Cap Prudhomme collection are listed in Table 18.14 based on data published by Kurat et al. (1994). The enrichment or depletion of trace elements in the MMs relative to average rocks of the continental crust (Taylor and McLennan 1985) was expressed as the logarithm to the base 10 of the MM crustal-rock ratios. The resulting distribution of data points in Fig. 18.31 indicates that the MMs are strongly enriched in iridium and gold as well as in nickel, chromium, selenium, iron, cobalt, arsenic, and antimony relative to crustal rocks. 

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