The EDS analysis reported the decreasing amount of Nickel on catalyst surface after hydrogenation reaction. I thought there is leaching of Nickel during reaction and easier than leaching copper. But why and what is the properties of Nickel that can explain this result, the leaching of Nickel on catalyst.
Dear Thanakorn Lowasri I'm not an expert in heterogeneous catalysis, but to my knowledge the encapsulation of metal catalysts in SBA mesoporous silica materials in done particularly in order to prevent leaching of the metals. For more information about this please have a look at the following very useful review article:
Current advances in the utility of functionalized SBA mesoporous silica for developing encapsulated nanocatalysts: state of the art
https://pubs.rsc.org/en/content/articlehtml/2017/ra/c7ra04833e
This is an Open Access article which is freely available on the internet (see attached pdf file). Several cases of metal leaching are discussed in this review. I actually do not know why in your case nickel is leached to a larger extent than copper.
Good luck with your research!
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