Abstract:
A series of Ni\SiO2 catalysts were synthesized by heating different Concentration of NiCl2 impregnation SiO2 (at load 1 %, 3%, 5 % 8 % and 10%, respectively) at 110, 300, and 500 C The nature of surface species upon drying, and thermal treatment were characterized using different microscopic techniques such as XRD, EDX-SEM spectroscopy .The obtained result showed that there is a significant difference in the microstructure of the catalyst in different Concentration applied for pure silica and NiCl2 calcinated at 300 C 500 C, showed that the characteristic peak of silica is shifted to different Ɵ position from 15 °, 22 ° ,55°, to Ɵ equal 28 °, 35 °, 38 ° ,44 ° 55 ° ,65 ° 75 ° and 80°. While in concentration of silica supported nickel at 1%, 3%, 5%, 8% and 10% nickel chloride impregnated silica at 300 C and 500 C the back scattering peak, shifted from the concentration increased and anew peak was appeared. for the nickel chloride supported silica at 8% and calcinations at 300 C and 500 C showed the same shifted pattern from Ɵ equal 25 ° 30 ° 35 °, 45 ° 55 °, 65 .° at 500 C and equal 75 ° at 300C to 28 ° 30 ° 33 °, 38 ° 40 °, 42 °,46 °,50 . °,65 ° 75 °,and 80.° Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) of pure silica calcinated at 300 C and 500 C showed the map like flower shape is white and brown color in concentration of
VI
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silica supported nickel at 1%, 3%, 5%, 8% and 10% nickel chloride impregnated silica at 300 C and 500 C the new phase was appeared and dominated as the concentration increased for increase concentration level. And the shape of maps changes to be black, brown, red and green. The results indicate that following (the drying step and calcinated 300 C and 500 C). The Nickel occurs in many detectable forms. NiCl2 particle and Ni – O surfaces. Calcinations appear to transform the NiCl2 (Ni (OH) CL) (NiOCL) and NiO surface species.
