different morphology of the carbon deposits was observed after
CO2 reforming on 2.5 wt.% Rh/Na-Y (IWI).
TPO characterization of carbon deposits in used catalysts (in
Fig. 11D) showed that, Rh supported on Na-Y and Al2O3 show
much smaller amounts of carbon deposition after the reaction
compared with Ni catalysts. SEM investigation of used catalysts
shows different effect of type of support (Na-Yor Al2O3) on the
carbon structure. Avery unusual form of carbon on used Rh/Na-
Y catalyst was observed by SEM in Fig. 12, where the carbon
deposits in the form of closely-knit coils dominate.