Abstract
In the present work, the crystallographic properties of unsupported Ni-Mo catalyst serie were carried out. They were synthesized with a ratio of Mo from 10, 25, 50 to 75 wt%. The final catalysts were characterized by X-ray diffraction (XRD) in order to identify crystallographic phases present in the solids using DRXwinsoftware version 2.3. The crystal size was determinated by Bragg’s law. Ni-Mo catalyst model (MoC-75) structure was modeled by Carine Crystallography Software version 3.1 which was built based on its space group and atomic positions which were previous the results of XRD. Characteristical phases of Ni-Mo Carbides were identified for their typical planes (111), (200) and (311) for Ni-Mo series and the plane (101) for the a Mo-C series.
Highlights
The research of new catalytic materials has attracted special interest in the preparation of ceramic composites, such as transition metal carbides with high surface areas [1]
The salts sources used were: nickel nitrate (NiNO3), ammonium heptamolybdate (NH4)6MoO24·4H2O (Aldrich Chemical Co., 99.97% purity) which is homogenized according to synthesis final oxide, once the corresponding homogenization is made, the mixture was dried at 120 ̊C for 24 h, and subsequently calcined at 500 ̊C in order to obtain NiMoO4
The original oxide mixture was founded by the presence of NiMoO4 (200) plane, near to 27 grades, which was identified by the JCPDS card 18 0879
Summary
The research of new catalytic materials has attracted special interest in the preparation of ceramic composites, such as transition metal carbides with high surface areas [1]. These materials have high strength and catalytic activities, for example for use in hydrotreating processes. Within this type of new materials, the most studied solids are molybdenum carbides, due to their similar activities to a commercial catalyst of NiMo/Al2O3 in hydrotreating reactions. The main purpose is to understand the relationship between the selectivity of the catalyst to their physical and chemical properties and the fi-
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