Experiments demonstrating foam formation

Similarly, a Rh foam monolith with 0.56 wt.% Rh gave a lower optimal H2 selectivity than a Rh foam monolith with 9.83 wt.% Rh (75% vs. 87%). In both the Pt and the Rh experiments, the samples with the lower metal loa gs had significantly higher adiabatic reaction temperatures because of the heat generated by the formation of H2O. As demonstrated by these experiments, the formation of H2 occurs on the noble metal surface, not in the gas phase or on the catalyst support. 

The process of hole formation and expansion inside the foam films was directly observed with larger vertical foam films (2X3 cm ) by using a high-speed video camera [11]. Solutions of 10 mM AOT and siUca-PDMS compound were used in these experiments. The results unambiguously demonstrated that the fast antifoams ruptured the foam films (not the GPBs). 

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