Mobile phases strength conversion

Conversely, at lower temperatnres the hydrophobic effect entropically leads the adsorption of the solutes [12]. Actually the solvent strengths of aU mixtures change with temperature [13] and this influences selectivity. Also, the non-constancy of with changing temperature may also be due to the difference of the heat capacities of the analytes in the mobile and stationary phases according to the Kirkhoff equation... 

The effects of rare earth oxides could be concluded from Table 3, 5 and 7 (a) to improve catalytic activity (b) to improve mobility of lattice oxygen in catalyst B and its activity for CO and HC conversion in a lower ratio of air/fuel (c) to improve thermal stability of support to resist crystalline phase change to a phase and maintain crushing strength and surface area. 

---