Silver loading

C. Lipschitz, H. Iith, G. J. de Jong, U. A. Th Brinkman and R. W. Frei, Trace emich-ment of pyrimidine nucleobases, 5-fluoro-uracil and bromacil on a silver-loaded tliiol stationaty phase with on-line reversed-phase high-perfomance liquid cliromatography , J. Chromatogr. 471 321-334 (1989). 

Figure 12.22 SFC-GC analysis of aromatic fraction of a gasoline fuel, (a) SFC trace (b) GC ttace of the aromatic cut. SFC conditions four columns (4.6 mm i.d.) in series (silica, silver-loaded silica, cation-exchange silica, amino-silica) 50 °C 2850 psi CO2 mobile phase at 2.5 niL/min FID detection. GC conditions methyl silicone column (50 m X 0.2 mm i.d.) injector split ratio, 80 1 injector temperature, 250 °C earner gas helium temperature programmed, — 50 °C (8 min) to 320 °C at a rate of 5 °C/min FID detection. Reprinted from Journal of Liquid Chromatography, 5, P. A. Peaden and M. L. Lee, Supercritical fluid chromatography methods and principles , pp. 179-221, 1987, by courtesy of Marcel Dekker Inc.

Figure 14.14 Schematic diagram of the SFC olefins analyser system Cl, high-surface-area silica column C2, silver-loaded silica column VI and V2, six-poit valves FID, flame-ionisation detector UV, ulcaviolet monitor detector.

The silver-loaded Ti02 film is irradiated with visible light (normally monochromatic light from a lamp with a... 

It has been reported (Calzaferri et al., 1984) that oxygen from water is evolved upon irradiation of a silver-loaded zeolite (a group of alumino-silicates) suspension according to the following overall stoichiometry ... 

Meunier, FC Ukropec, R Stapleton, C Ross, JRH. Effect of the silver loading and some other experimental parameters on the selective reduction of NO with CsH over AI2O3 and Zr02-based catalysts. Appl Catal, B Environmental, 2001, Volume 30, Issues 1-2, 163-172. 

Another method to control silver content in the active layer is to use active powders with different silver loadings. Even though this method introduces additional complexities since the intrinsic reactivities of these active powders may be different, a... 

The same holds for Silflon cathodes, which with silver loadings of 0.1 g/cm2 of electrode area exhibit an active catalyst surface of no more than 0.24 m2/m2. These Silflon electrodes are produced by chemically depositing silver on PTFE particles of 0.5 to 1 fim size and working these tiny silver-covered particles into electrodes by calendaring or pressing. Figure 22 compares the current voltage curve of typical gas diffusion cathodes in alkaline electrolyte. 

Connection between the electrode material and lead or shaft is made in one of four ways soldering, with silver-loaded epoxy resin, spot welding, or by spring-loaded contacts. 

Yoshida M, Tashiro H, Iwami K, et al. 1983. Bioavailability of selenite, selenomethionine and selenocystine in rats with silver loading. Agric Biol Chem 47 807-813. 

The silver-loaded titania photocatalysts possess high activity in the photocatalytic decomposition of ozone [38], photoreduction of various thiols [39], photodestruction of 1,4-dichlorobenzene [40], dehydrogenation and oxidation of alcohols (e.g. of 2-propanole [41,42]), decoloration of textile waste water [43], photokilling of bacteria [44], and others. For additional detailed information on this topic, one can use a number of review articles and books [e.g. 45-48]. 

Ag/Al203 catalysts with various contents have been characterized using TG, DTA, TPD and NH3 and CO2 adsorption calorimetry [72]. The results were discussed in terms of silver loading and interactions with the alumina surface. An increase of the total amount of basic sites was globally observed. 

CHARACTERIZATION AND ETHYLENE ADSORPTION PROPERTIES OF SILVER-LOADED FER ZEOLITE POTENTIALLY USED AS TRAP MATERIAL OF COLD-START HYDROCARBON EMISSION FROM VEHICLES... 

The adsorption properties of silver- and cupper-loaded zeolites for C2 and C3 hydrocarbons were investigated to explore excellent materials for cold-start hydrocarbon trap. The adsorption property and the stability of the adsorbents depended significantly on the metal species and host zeolites. It has turned out that silver-loaded ferrierite zeolite is the promising material with excellent olefin selectivity, high adsorption capacity, desirable storage ability and hydrothermal stability. 

Laakso and Voutilainen [18] demonstrated the applicabihty of silver-loaded ion-exchange (Ag ) colunms in the LC-MS analysis of TAG. Isomers of a- and y-linolenic acid from seed oils were separated and subsequently characterized by LC-APCI-MS. Schuyl et al. [19] applied Ag" -colunm LC-ESI-MS for the... 

Wan, Y.Z., Wang, Y.L., Cheng, G.X., et al. (2001). Preparation and characterization of activated carbon fiber supporting silver-loaded mesoporous molecular sieves. Carbon, 39, 1605—16. 

For permanent fixation of 1 adsorption on silver-loaded adsorbents, such as zeolites, silica, or alumina, will be the choice [PI, W2]. The process is simple, the bed temperature may be relatively high, the product is a dry solid, the chemisorbed iodine is highly insoluble, and the adsorbent is very efficient in removing both organic and inorganic iodine from gas streams. 

Fig. 2 shows the NOx conversions for the SCR of NOx by C dh. over Ag/AI Oi catalysts with diflerem silver loadings at various lemperaiures. As shown in Fig. 2. the maximum of NOx conversion increased significantly with an increase in silver loading from 2 wt% to 4 wt%, and the temperature at which the maximum NOx conversion could be obtained (i.c. Tnux) shifted towards a lower temperature. Further increase of the silver loading from 4 wi % to 8 wi° o did not show any promotion of low-temperature NOx conversion but inhibited the high lempcrature conversion. 

Figure 7.5. Separation of triacylglycerols in soybean oil on a silica-based, silver-loaded cation-exchange column (29 cm x 0.25 mm I.D.) with carbon dioxide-acetonitrile-isopropanol (2.8 6.5 0.7) as mobile phase. Start 115°C and 260 atm after2 min programmed at-l CVmin to 75°C and 1 atm/min to 300 atm. (From ref.

Silver-loaded layers for thin-layer chromatography are usually prepared by slurrying silica gel with an aqueous solution of silver nitrate (1-2 % w/v), or by immersing precoated silica gel layers in a 0.5 % (w/v) solution of methanolic silver nitrate... 

AgNaZSM-5 catalysts were investigated for the selectively catalytic reduction of NO by methane in the excess of oxygen. It was clearly depicted that the conversion rate of NO to N2 had a linear dependence on the silver loading (4.32 13.64%), which indicated that all silver species in the zeolite were active for the CH4-SCR reaction. The presence of excessive oxygen in the feed gas favored the CH4-SCR reaction. The temperature programmed desorption profiles in He and 2%CH4/He after the co-adsorption of NO and O2 revealed that surface nitrates were formed on silver catalyst, and could be effectively reduced by methane... 

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