Abstracts Book - IMRC 2018

• SF5-P058
DEVELOPMENT OF MIXED OXIDES BASED ON CEO2 AND THEIR
EVALUATION AS CATALYSTS IN THE OXIDATION REACTION OF
CARBONACEOUS PARTICULATE MATERIAL FROM EMISSIONS OF
DIESEL ENGINES
Wendy Noemi Téllez Salazar 1 , José Ortiz Landeros 1
1 Instituto Politécnico Nacional - IPN, CEPROMIM, Mexico.
Due to the environmental impact caused by the emission of pollutants into the
atmosphere, such as particulate carbonaceous material (MCP), known as soot
too, carbon monoxide (CO) and volatile organic compounds (VOCs), the
mitigation of these compounds is a task priority to preserve air quality.
Furthermore, by reducing the emissions to the atmosphere of said compounds,
the harmful effects they have on the health of the human being are reduced,
since they have carcinogenic properties, cause eye and respiratory tract
irritation as well as alterations of the skin. Therefore, in this research work
efforts will be aimed at reducing the emission of these pollutants into the
atmosphere through oxidation reactions using cerium-based nanometric mixed
oxides (CeO 2 ). These mixed oxides based on ceria will be constituted by ceria,
zirconia and yttria. It has been worked with ceria due to the capacity it has to
capture and release oxygen, a characteristic it possesses thanks to the fact that
it can exchange its oxidation state between Ce 3+ /Ce 4+ . This particularity
generates the formation of oxygen vacancies and therefore allows the ionic
diffusion of oxygen through the network to be carried out so that the oxidation
reaction of the species in question is promoted. In addition to the above, the
zirconia and yttria codoping promotes the formation of defects in the network,
which will improve the ionic diffusion of oxygen, with this the formation of
vacancies and therefore the oxidation of the MCP, CO and VOCs is
promoted. These mixed oxides were prepared using the conventional
hydrothermal and hydrothermal assisted microwave synthesis method. So far,
with the conventional hydrothermal method and assisted by microwaves; mixed
oxides of the ternary and binary system have been obtained by varying the
parameters of temperature, reaction time, concentration of the mineralizer and
concentration of the precursors. The percentage of filling volume of the
autoclave has been maintained with a constant value of 50%.