High resolution scanning electron microscopy (SEM) (LEO 1530) was used to study the surface morphology of the used catalyst. The system used was a Gemini Field Emission Gun SEM, FEGSEM LEO 1530, manufactured by Zeiss, Oberkochen, Germany. The SEM used an accelerating voltage of 3 KV, at a working distance of 3e8 mm from the electron gun and an 80 mm X-Max SDD detector.