It is clear from Table 1 and Figure 2 that there is no linear correlation that exists between the catalytic activity and the Cu surface area. Evidently, the activity of the CZC samples is not only determined by the Cu surface area, but also by the particular microstructure copper particles which may be similar to the microstrain in Cu/ZnO catalysts. After 5 days the catalytic activity considerably diminished although at different extent. There was no systematic variation with the Cu content displayed as a factor of diminishing of Cu content. The conversions determined after 5 days approached a constant value, except for CZC5, which exhibited a significant decrease. The CZC samples containing more than 5% Cu contents displayed significantly long term stabilities after the initial period of deactivation. These seemed suitable for the extended operation. The relatively poor thermal stability of CZC5 may be linked to the small Cu particle size, considering that small particles tend to be more susceptible to thermal sintering under reaction conditions, even at temperatures lower than 573 K. For comparison purposes the CZC samples containing no copper were prepared using the procedure described above. The as prepared new material did not exhibit any detectable activity in the steam reforming of methanol under the reaction conditions employed. Hence, the differences observed for the CZC catalysts in the steam reforming of methanol can be mainly attributed to the bulk and surface properties of the Cu phase in these materials.
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