I am using a Ni, Co, Ru activated carbon catalyst (simple impregnation method) for hydrogenation. But I am facing the metal leaching problem during recyclability. Please suggest to me some synthesis modifications, which will be beneficial to stop metal leaching and will not affect catalyst activity.
Is metal in particle form or molecular? Does the metal diffuse into the pores or It's on the surface? Do you have any TEM images of your catalyst?
Dear Adarsh Kumar you should change your synthesis method to achieve your purpose. You can use two methods:
1) You can graft linker on the surface inside the pores then when you using impregnation technique the linker help the metal salt to diffuse into the pores and stabilized there then use a reducing agent like NaBH4 to form particles inside the pores.
2) You can use the activated carbon substrate as a sieve to filter the particles. First you should synthesis the particles by hydrothermal treatment or some method that has low aggregation. Then you must add the substrate to the suspension and keep it on stirring and evaporate the solvent (this step take too much time and should done slowly about one week). Then you can do the calcination step.
Read these articles for more information about the synthesis methods:
https://pubs.rsc.org/en/content/articlehtml/2012/cc/c2cc35272a
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