A variety of reactions can be observed in both samples. In the smaller crystallite size sample, oxidative and non-oxidative dehydrogenation and total combustion at a 2-propanol:O2 ratio of 2:1 can be identified. At a ratio of 1:1, partial oxidation is suspected to occur additionally due to more pronounced H2 evolution as non-oxidative dehydrogenation is expected to be supressed at higher levels of oxygen. In the larger crystallite size sample at a 2-propanol:O2 ratio of 2:1, oxidative and non-oxidative dehydrogenation are predominant with only a small degree of total combustion, which is higher in the second cycle. At a ratio of 1:1, H2 evolution/non-oxidative dehydrogenation is supressed and CO2 evolution/total combustion more favoured. Figure shows the 2-propanol conversion rates of both samples and at both 2-propanol:O2 ratios. The larger crystallite size sample performs slightly better at temperatures up to 250 °C at both 2propanol:O2 ratios and the increased O2 level only slightly increases the conversion of 2propanol. The smaller crystallite size sample performs better above 250 °C and the conversion is considerably increased at the higher O2 level. In the second cycle, the conversion in the smaller crystallite size sample decreases drastically except for the maximum temperature of 400 °C, while only a minor decrease can be seen in the larger crystallite size sample. However, at the lower O2 concentration, the 2-propanol conversion at 400 °C is lower.