Rhodium mercury containing

Probably the most numerous bimetallic complexes of rhodium are those containing mercury. The complex //-[RhHCl (AsMePh,)3 ] reacts with mercury(II) halides,1351 phenylmercury(II) halides,1352 or mercury(I) halides 351,1352 to produce/ac-rhodium-mercury complexes (145) (equation 333). The physical properties of the products are shown in Table 94. 

COMPOUNDS CONTAINING RHODIUM-MERCURY. OSMIUM-MERCURY OR IRIDIUM-MERCURY BONDS. 

The "mixed" bimetallic complex RhCl(PBu Pr2)2(u-Cl)2PtCl(PBu Pr2) in which the phosphines are axial and trans shows J(Rh,P) = 95.6 Hz [128], Many of the molecules mentioned represent new and interesting molecular types, e.g. XXII, which contains a rhodium-mercury bond, and we shall return to these at a later point. 

W. H. Wollaston discovered rhodium in 1803-04 in crude platinum ore. Although he did not definitely state the source of this ore, it must have come from South America the Russian platinum ores had not yet been discovered. Since the platina to be procured in this country, said Wollaston, generally contains small scales of gold intermixed, as well as a portion of the mercury which the Spaniards employ for the separation of the gold, the platina used for my experiments, after being by mechanical means freed, as far as possible, from all visible impurities, was exposed to a red heat for the purpose of expelling the mercury (9). 

When ethylene was passed into a basic solution of Hg(OAc)2 containing a catalytic amount of [Rh2(OH)3(C5Me5)2]+, ethanol was formed.617 It appears that mercury salts of the type HOCH2CH2HgOAc are formed in a stoichiometric reaction so that this is not strictly a catalytic activation of ethylene by the rhodium complex. 

When fuel contains heavier hydrocarbons than methane, or it is biofuel, or contains alcohols, the feedstock often contains additional compounds such as sulphur and phosphorus, that is, fertiliser impurities. In the petrochemical industry, gas-borne reactive spedes (i.e., sulphur, arsenic, chlorine, mercury, zinc, etc.) or unsaturated hydrocarbons (i.e., acetylene, ethylene, propylene and butylene) may act as contaminating agents (Deshmukh et al, 2007). These impurities cause catalyst deactivation by poisoning. The effect of a poison on an active surface is seen as site blockage or atomic surface structure transformation (Babita et a/., 2011). Therefore, it is important to choose poisoning-resistant catalyst materials. For example, nickel is not the most effective MSR catalyst although it is widely used in industry due to its low market price compared to ruthenium and rhodium. Both Ru and Rh are more effective in MSR and less carbon is formed in these systems, than in the case of Ni. However, due to the cost and availability of precious metals, these are not widely used in industrial applications. 

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