Impregnation gels impregnated with metallic

Sulfonamides can be analyzed both by NP TLC (on silica gel, alumina, polyamide, and Florisil layers) and by RP TLC (on silanized sihca, RP-2, RP-8, and RP-18 layers). Some sulfonamides have been separated by TLC on silica or polyamide impregnated with metal salts. Both aqueous and non-aqueous eluents are applied. Detection of sulfonamides can be performed on fluorescence layers at 254 nm and after derivatization with, for instance, fluorescamine solution at 366 nm. 

Gels Impregnated with Metal Salt Solutions... 

To obtain composites of carbon with metal nanoparticles, organic gels can be impregnated with metal salt solutions before drying and pyrolysis processes... 

Silanized Silica Gel Plates Impregnated with Metal Complexes of a... 

SILANIZED SILICA GEL PLATES IMPREGNATED WITH METAL COMPLEXES OF A CHIRAL SELECTOR... 

Co-Rh catalysts were prepared on silica gel by impregnation with a pentane solution of Rl Cc (CO), After reduction at 823 1C for 20 hours, there were diffraction peaks due to the Co-Rh alloy, but also peaks from the metals themselves. 

In silver staining, the gel is Impregnated with soluble silver ions and developed by treatment with formaldehyde, which reduces silver ions to form an insoluble brown precipitate of metallic silver. This reduction is promoted by protein. 

Sfiica impregnated with saturated and unsaturated hydrocarbons (squalene, paraffin oil), silicone and plant oils, complexing agents (silver ions, boric add and borates, unsaturated and aromatic compounds), tigands (EDTA, digitonin), and transition metal salts silanized silica gel impregnated with anionic and cationic surfactants Cross-linked, polymeric dextran gels (Sephadex)... 

A thiocyanate medium was applied in separating Be on a silica gel column impregnated with TBP. Beryllium was eluted with 0.1 A/ HCl [16]. The same sorbent impregnated with HDEHP was used for selective pre-concentration of Be and for isolation of this element from a number of other metals [17]. 

We also prepared supported catalysts by the impregnation of silica gel in isopropanol with metal salt, followed by its decomposition under heating (Me-Sup). 

Adsorbent costs vary with time, supplier, and other factors, even for the same exact material. Prices often range from 0.50 per pound for some commodity adsorbents to 100 per pound or more for more exotic materials. Some that are impregnated with expensive metals are much higher priced. Price is also sensitive to quantity. For example, from a laboratory supply house, in 100-g quantities, activated alumina and silica gel cost as much as 70 to 140 per pound. But in tonnage quantities, they may sell for less than 1 to about 4 per pound. 

Lipid-Bound Macrocycles as New Immobilized Ligand Systems for Effective Separation of Metal Cations (Tsukube et al., 1991) (5) Application of Macrocyclic Ligands to Ion Chromatography (Lamb and Smith, 1991) (6) Chromatographic Separation of Metal Cations on Silica Gel Chemically Modified with a Polymeric Diaza-18-crown-6 Derivative (Basyuk, 1991) and (7) Column Preconcentration of Trace Metals from Sea Water with Macroporous Resins Impregnated with Lipophilic Macrocycles (Blain et al., 1991). 

Back in 1978, Kaimai and Matsunaga tried to separate PAHs and PASHs by thin layer chromatography on silica gel impregnated with several metal acetates. Mercury acetate showed the best results. Following that idea, separation was tested by Andersson on a mercury-acetate-substituted phenyl kieselguhr. However, PASHs could not be separated selectively. 

Silica-supported various metals (M) were tested as the catalyst for the oxidation of methanol in the presence of MP. Dry gel of silica was prepared from colloidal silica and it was impregnated with an solution containing metalic components (M). The M/Si atomic ratio was 10/1000. The catalysts were then calcined at 400 °C for 4 h. Over the 2.0 g portion of each catalyst, a mixed gas consisting of MP, methanol, oxygen, and nitrogen was passed at 360 °C with feed rates of MP/methanol/oxygen/nitrogen = 50/75/10/250 mmol/h. The results obtained in the oxidation of methanol are listed in Table 2. 

Figure 9. (a) TEM micrograph of a supported metallocene/ MAO catalyst particle prepared by gas-phase Impregnation with TMA/H2O. (b) EDX line scan analysis of the metal-locene/MAO-supported silica gel regarding the silicon and aluminum distribution in the volume. Under this condition, the active sites are formed on the outer surface of the particle. The mean particle size shifted from 50 /rm for the silica support to 70 /nm for the catalyst. 

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