Incipient wetness procedure

The incipient wetness procedure involves the wetting of the support with just enough of a solution of the active species to fill the pores of the support material. This is usually accomplished by adding the solution slowly to the solid... 

Rh-Pd/Al203 catalysts were prepared by the incipient wetness procedure using a solution containing both rhodium chloride and palladium chloride. 0 When a small amount of palladium was present, the palladium segregated toward... 

The Ni/YSZ catalyst was prepared by ball milling 50 wt.% NiO and 50 wt.% yttria (8 mol%)-stabilized zirconia (YSZ) in methanol for 24 h. The YSZ was used as a support because it is commonly used as the electrolyte/support in SOFCs. The high Ni loading is required in SOFC to facilitate electron transfer. The Sn/Ni alloy catalyst was synthesized using a sequential incipient wetness procedure with tin chloride impregnated on NiO/YSZ. After calcination of this material at 873 K, the catalyst was reduced at 1073 K under 30% H /N. [16]... 

Triphenylarsine (AsPhs) and benzene were purchased from Aldrich. The n-heptane used as solvent was freshly distilled and was kept in a glass flask, under argon. Alumina supported nickel were prepared by the incipient wetness procedure. The alumina surface area was measured by N2 adsorption and the metal loading was measured by elemental analysis. 

The much more stable MIL-lOO(Cr) lattice can also be impregnated with Pd(acac)2 via incipient wetness impregnation the loaded catalyst is active for the hydrogenation of styrene and the hydrogenation of acetylene and acetylene-ethene mixtures to ethane [58]. MIL-lOl(Cr) has been loaded with Pd using a complex multistep procedure involving an addition of ethylene diamine on the open Cr sites of the framework. The Pd-loaded MIL-lOl(Cr) is an active heterogeneous Heck catalyst for the reaction of acrylic acid with iodobenzene [73]. 

The colloidal suspensions obtained by the neutralization or thermohydrolysis procedures described previously have been used to prepare supported Pd catalysts. The support is impregnated with a volume of colloidal oxide suspension corresponding exactly to the porous volume of the solid, according the well-known incipient wetness impregnation. 

The catalyst 1 wt.% Pt/ASA [2.5] was prepared with incipient wetness impregnation, using the same procedure as described for the Pt/SiC>2 [big] catalyst. The calcination-reduction scheme was similar to the Pt/ASA [11.3] catalyst (Figure 2D), with the exception that the calcination heating rate was 0.2°C/min. 

We will try to separate as far as possible the procedures of preparation from the chemical reactions that occur during these preparations. For instance in the case of impregnation to incipient wetness, both the metal ions and the counter-ions are deposited on the support, but the speciation of the metal-containing ions may vary with the pH of the solution in contact with the support, and the way in which they interact with the support will also depend on the PZC of the support. 

Incipient Wetness Impregnation. A procedure similar to dry impregnation, but the volume of the solution is... 

Akins et al. successfully immobilized polyoxometaloeuropates [(Eu2PWio038)4(W30s (H20)2(0H)4)] inside the channels of MCM-41 mesoporous molecular sieve material by means of the incipient wetness method. For proper host-guest interactions, amine groups were introduced into the system as a result of an aminosilylation procedure. The photoluminescent behavior of the composite at room temperature indicates a characteristic trivalent europium emission pattern corresponding to Dq transitions. Such a composite might represent a new material with potential applications as a photoluminescent device or phosphor [85]. 

Experimental Procedure. FCC catalysts employing the submicron zeolite structure were used in this study. These catalysts were synthesized, spray-dried into 60 /tm pellets and impregnated with the metals by the incipient wetness technique at CREC-UWO. 

The more common methods for preparing supported oxide catalysts involve the dispersion of the active species or its precursor onto the surface of a preformed support. This has been accomplished using procedures referred to as equilibrium adsorption, incipient wetness or dry impregnation.9,20... 

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