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hydrothermal aging
Moreover, we have determined the role of the interphase formation on the practical adhesion before and after hydrothermal aging.
      
Hydrothermal aging of such catalysts is therefore limited during operation in the plant.
      
Based on the hydrothermal aging results, the possible existence of a larger two-phase (cubic+tetragonal) region is suggested, and the phase boundary between the cubic+tetragonal and cubic phase in the ZrO2-Sc2O3 system is proposed.
      
These materials were subjected to a specific hydrothermal aging process, which was prepared from a precursor solution containing AcAc with the molar ratio AcAc/Ti=1.
      
XRD patterns of S1 sample after hydrothermal aging for 4 hours.
      
XRD patterns of S8 sample after hydrothermal aging for 4 hours.
      
After hydrothermal aging, the samples were measured their specific surface areas and analyzed material phase with XRD.
      
Conversion Performance Figure 5 shows propane conversion efficiency of S1 sample according to hydrothermal aging temperature.
      
Figure 3 shows XRD patterns of S1 sample according to hydrothermal aging temperatures.
      
Figure 4 shows XRD patterns of S8 sample according to hydrothermal aging temperatures.
      
Figure 6 shows propane conversion of S2 sample according to oxygen concentration after hydrothermal aging at o C temperature.
      
Figure 7 shows propane conversion of S7 sample according to oxygen concentration after hydrothermal aging at C temperature.
      
Propane conversion according to hydrothermal aging temperature of S1 sample.
      
Propane conversion of S2 sample according to oxygen concentration after aging at C hydrothermal aging.
      
Propane conversion of S7 sample according to oxygen concentration after aging at C hydrothermal aging.
      
Summary of phase transformation temperatures of the samples after hydrothermal aging for 4 hours.
      
Summary of conversion performances of the samples after hydrothermal aging for 4 hours.
      
Six kinds of additive were coated with two kinds of photocatalyst and the samples were aged with a hydrothermal aging process.
      
This means that P2 TiO2 material is superior to P1 material in hydrothermal aging condition.
      
The durability of a photocatalyst was also studied with hydrothermal aging method.
      
 

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