Acid site and metal site can affect together in the reaction condition. So, it can reduce the catalytic activity since the metal nanoparticle sites cannot survive in the presence of acidic situation.
I recommend to you, after the preparation of the catalyst to submit it to stability tests. In order to transform the unstable species or tear the active species, and after the stability tests you can prove the catalytic properties in the interest reactions.
In addition, you can determinate the catalytic species who survive to the stability tests.
It is interesting how the Ni (according to XPS analysis) resisted the acid attack. Maybe in your Ni XPS signal can you observe a shoulder of Ni2+ from NiO very slight.May be for a formation of core shell particles, where elemental Ni is covered with a light layer of NiO. Or maybe some interaction of Nio particles with the support.
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