Precursors aqueous inorganic

The cobalt catalyst can be introduced into the reactor in any convenient form, such as the hydrocarbon-soluble cobalt naphthenate [61789-51 -3] as it is converted in the reaction to dicobalt octacarbonyl [15226-74-17, Co2(CO)g, the precursor to cobalt hydrocarbonyl [16842-03-8] HCo(CO)4, the active catalyst species. Some of the methods used to recover cobalt values for reuse are (11) conversion to an inorganic salt soluble ia water conversion to an organic salt soluble ia water or an organic solvent treatment with aqueous acid or alkah to recover part or all of the HCo(CO)4 ia the aqueous phase and conversion to metallic cobalt by thermal or chemical means. 

The photoassisted reduction of aqueous carbon dioxide in the presence of inorganic minerals has been examined as a model of prebiological photosynthesis,120 a potential precursor to the photosynthetic fixation of C02 by plants. 

For some elements, there are a variety of possible precursors, sulfur for instance (Figure 11). Use of metal-organic precursors, used in MOMBE or MOVPE, are possible if they are soluble in water, or a nonaqueous solvent is used. Mixed aqueous-organic solvents could improve solubility. Overall, there would be an increased probability of carbon contamination, however. One of the benefits of using inorganic salts in aqueous solutions is that the number of constituents is limited, and thus the... 

It is possible to extract the nanocolloids from aqueous solution into an organic phase or to support them onto inorganic supports by what is called the precursor method (described in Section 3.5) to generate heterogeneous catalysts. Such catalysts find application in chemical catalysis, e.g., in selective hydrogenation of fatty acids. 

All these techniques can be combined to obtain more precise control over several scales, as done by Stucky et al. to create hollow microcavities in mesoporous silica. In order to do that, the inorganic precursor (silicon alkoxide) was dissolved in the oil droplets of a regular (not inverse) microemulsion, while the surfactants were in the aqueous phase. Both the mesopore (produced by the surfactant) and microcavity (formed by the oil droplets) sizes could be controlled by varying the... 

In aqueous solution, the solvated aquo, hydroxo, or oxo complexes (Equation 1) of metal ions undergo hydroxylation yielding hydroxy precursors (Equation 2) that are subjected to inorganic polymerization reactions. Depending on the chemical nature of the metal ion, either olation (Equation 3) or oxolation (Equation 4) happens. Ola-tion results in the formation of hydroxo bridges between the central metal atoms involving polycations as intermediates, while oxo bridges are formed in oxolation via polyanions. 

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