Matsuzaki, R. et al. Three-dimensional printing of continuous-fiber composites by in-nozzle impregnation.
In the impregnation technique, silica particles were added, then removed by dissolution in alkaline medium.
We observed a maximum CO2 uptake of 93mg/gfiber at 20 wt.-% of PEI in the impregnation solution.
In catalyst manufacturing, heat transfer through granular media (catalyst) occurs in the impregnation and calcinations stages.
For low PEI fractions in the impregnation solution, the high surface area and porosity of the microtubes is preserved, and the CO2 uptake increases with increasing PEI fractions.
The greater nucleation in the impregnation method leads to agglomeration of metal nanoparticles.
The effect of the solvent used in the impregnation step has been investigated in Co-based catalysts.
Although, at pH 1.5 platinum was adsorbed completely, but a uniform bed of catalyst in the impregnation reactor was not obtained after the impregnation was finished.
This demonstrates that using the sol-immobilisation method we are able to utilise the precious metals much more effectively, as in the impregnation method a significant fraction very large particles are also generated and these have very limited catalytic activity.
The catalysts obtained from Ni acetate suffered deactivation from the beginning of reaction regardless of the solvent used in the impregnation step.
