Following other comments written elsewhere, it might be worth pointing out once again that this thread is not just original research for LENR replications. For the most part I looked for more detailed studies about the characteristics of these catalysts following Holmlid's references and pointers from his papers about them.
Even in his latest one, Holmlid still refers to other works in the literature describing in detail the characteristics and stability of their active state. That he's been citing specifically these two papers consistently throughout the years, should suggest that perhaps the subject they cover might be crucial.
From Meima and Menon (ref. 31):
From Muhler et al (ref. 32), right in the introduction: