In contrast, the 5% Ni/MgO catalyst, having the same composition but prepared by impregnation, presents a high activity for the same calcination and reaction conditions.
Although HT phases were present after impregnation, tetrahedral CuO and ZnO were found in the mixed oxide after calcination.
By contrast, when 4 M HNO3 was present during the impregnation, the largest impregnant particles found were less than 4 nm.
This study presents an impregnation test setup and assesses the effect of various synthesis parameters such as sintering temperature, composition, macroporosity and macropore size on the impregnation properties of porous β-tricalcium phosphate scaffolds dipped in water.
In both unpromoted and Ru and Re-promoted cobalt catalysts after impregnation and drying, cobalt is present mainly in octahedrally coordinated complexes.
The aim of this work is thus to rationalize the roles of these additives with respect to (i) species present in the impregnation solution as well as on the catalyst surface and (ii) the preparation step where the additive impregnation is performed, i.e. after drying or after calcination.
Transparent IOLs presenting an effective impregnation were obtained.
In the present study, the polymer impregnation approach was adopted to produce porous HA scaffolds with three-dimensional (3D) porous structures.
28 The present results demonstrate that impregnation with a polymer is an efficient way of reducing the density change during plastic flow of nanoporous metals under a uniaxial load.
Likewise, another 2%Na 10%Fe/HZSM-5 catalyst with a close intimacy we prepared by an incipient wetness impregnation method as a comparison also presented a poor performance on CO2 hydrogenation (Supplementary Table 3).
