A Rigaku Smartlab XRD analyzer was used to examine the catalysts.
Samples were ground at room temperature with an alumina
mortar and pestle and placed on the XRD holder. Samples were
analyzed at 40 kV and 44 mA at an angle of diffraction (2h) between
20 and 80 with a step-size of 0.2 and a scan rate of
0.5 min1.