Textural Properties of Mixed Oxides

For better comprehension, the textural properties from our previous study of the synthesized LDHs (ZnAl-LDH) and calcined mixed oxides (C-ZnAl) were obtained by low-temperature nitrogen adsorption and the changes in the surface area values and pore size distribution before and after thermal treatment are presented in Table 20.3 and 

Sample Surface area (m gr ) BJH desorption cumulative pore volume (cm g ) Dominant diamete bimodal distri mesopore r (nm) -pore size mtion Detected shoulder, mesopore diameter range (nm) 

Using the BJH (Barret-Joyner-Halenda equation) method the corresponding pore size distribution of the investigated samples was obtained from the desorption branch of the isotherms. A bimodal pore size distribution was identified in both samples, where ZnAl-LDH sample exhibited a low intensity peak in the area of smaller mesopores (=3.6 nm) and a broad peak in the area of larger mesopores (=30 nm). After thermal 

After thermal treatment (C-ZnAl), due to the destruction of the lamellar structure, the surface area increases 3.8 times and consequently the cumulative pore volume value is doubled compared to the dried sample. 

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Table 1. Textural properties of mixed oxides of Ce and V calcined at 200 C.

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