I would like to prepare metal-Carbon xerogel during pyrolysis of organic xerogel in presence of urea instead of hydrogen gas. If there is a previous literature add to me during colleagues. What is preferable for well dispersion of metals on surface of carbon xerogels, impregnation or doping during synthesis?
for well dispersion of metals on surface of carbon xerogels doping during synthesis is preferable but when metal precursor is added to initial resorcinol-formaldehyde mixture, it is more difficult to control the pore texture of the carbon matrix and some metal particles can be encapsulated by the carbon matrix. I suggest you the article of Moreno-Castilla and Maldonado-Hódar, carbon 43 (2005) 455-465
It depends on what you want to do. If you introduce the metal during synthesis, you'll be able to dope with high levels of metals, but most of it will not be available but dispersed in the bulk instead. On the other hand, if you impregnate the gel after synthesis, the metal will be present only at the surface. Therefore, for example for catalytic purposes, I would recommend the second way. The incipient wetness method works very well for that.
Alain
Sorry I'm a polymer physics, not knowing the subject matter of natural science. Perhaps someone else in those areas has the same name with me.
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