Abstracts Book - IMRC 2018

• SF3-O015
INFLUENCE OF STRUCTURING AGENT IN PHYSICAL AND
CHEMICAL PROPERTIES OF MO/SIO2 CATALYSTS FOR THE
SELECTIVE HYDROCARBONS OXIDATION
Alexander Baena Novoa 1 , William Giovanni Cortes Ortiz 2,3 , Carlos Alberto Guerrero Fajardo 1
1 Universidad Nacional de Colombia, Aprovechamiento energético de recursos naturales;
Facultad de Ciencias, Colombia. 2 Universidad el Bosque, Ad-honorem professor, Facultad de
Ciencias, Colombia. 3 Universidad Politécnica de Valencia, Instituto de Tecnología Química,
Spain.
Partially oxidized hydrocarbons are widely used as raw material in the industry;
they play an equally dominant role as intermediates for the manufacture of
everyday chemicals. These molecules are prepared natural gas and volatile
fractions of petroleum by partial oxidation. Currently, these substances are
produced by a conventional two-step process, which consumes a large amount
of energy. For example the conversion of methane to methanol in a single step
is preferable because of lower energy consumption and ease of storage; the one
step process provides the advantage of converting directly the methane to
methanol, which could reduce the cost of methanol production making it more
economically profitable. In the same way, structuring agent plays an important
role in catalytic material synthesis also the composition and the method
synthesis; these facts are significant in the surface area, distribution of active
species like Mo, pore volume, structure, isolated Mo species and operating
conditions of the Catalyst. In this work Mo/SiO 2 were prepared by sol-gel method
in a single step, which helps to obtaining large surface area of the support
facilitating a high dispersion. Catalytic materials were prepared using oxalic acid
or citric acid as the structuring agent and molybdenum loads in weight of 0.0 %,
3.0% and 6.0% using as precursors of molybdenum and silicon, molybdenum
acetate and tetraorthosilicate respectively. Samples were calcined at 600°C for
6 hours. FTIR analysis shows peaks in 3414 cm -1 , 1639 cm -1 , 1088 cm -1 and 466
cm -1, that corroborates the presence of SiO 2 and MoO 3 in the material. In Raman
analysis where obtained peaks at 483 cm -1 and 606 cm -1 confirms the presence
of SiO 2 and peaks at 818 cm -1 and 285 cm -1 corroborates the presence of MoO 3 ,
UV-Vis analysis shows that band gap value is 3.96 e.V. for the support with Mo
and 9.30 e.V. for the Silica, X-ray diffraction confirms the amorphous structure
of the catalyst. Finally, it can be said that high calcination temperature and solgel
method in one step allowed to obtain catalytic materials in which active
phase, is molybdenum under an oxidation process on amorphous silica.