Abstracts Book - IMRC 2018

• SF3-O030
CATALYTIC OXIDATION OF TOLUENE OVER CO-MN MIXED
OXIDES SYNTHESIZED BY AUTO-COMBUSTION METHOD AND CE
IMPREGNATED.
Luis Carlos Ojeda Perez 1 , Carlos Ostos 1 , Adriana Echavarria 1
1 Universidad de Antioquía, Grupo Catalizadores y Adsorbentes, Instituto de Química,
Colombia.
Volatile organic compounds (VOCs) are dangerous air pollutants and one of the
major contributors to the formation of photochemical ozone. One of the most
effective and economically feasible techniques for the elimination of VOCs is
catalytic oxidation, that targets the complete destruction of VOCs into CO 2 , water
and others relatively less harmful compounds. The technique is environmentally
friendly due to energy savings and fewer dioxins and noxious products formed
in comparison to thermal oxidation. However, for the successful
implementation of this process, one key factor in the reaction is the use of an
effective catalyst. Herein we evaluated the catalytic oxidation of toluene over Co-
Mn mixed oxides synthesized by auto-combustion and impregnated with cerium
(3% wt.).
Co and Mn oxides were synthesized by the auto-combustion method. Nitrates
of Cobalt [Co(NO 3 ) 2·6H 2 O], manganese [Mn(NO 3 ) 2·4H2O (50% wt. solution)] were
used as oxidizer and Glycine [CH2NH2COOH] was used as fuel to drive the
reaction. Molar ratios of fuel (glycine)/oxidizer (nitrates) used was 0.56
corresponding to stoichiometric conditions. Mixed oxides with different Co/Mn
molar ratios (0.5 – 1.0 – 2.0) were obtained through the addition of the nitrates
to the glycine, maintaining constant stirring. The resulting solution was slowly
evaporated until a gel was obtained. The gel was then heated to approximately
150°C for promoting the ignition process. Once the ignition reaction was
reached the powder produced was calcined at 500°C for 4 h to eliminate the
remaining carbonaceous residues and finally obtain the corresponding oxide.
The cerium impregnation was carried out by Charge-Enhanced Dry
Impregnation (CEDI) method. Microstructural, physicochemical and surface
characteristics of the synthesized materials were determined with respect to
their phase composition and mean crystallite size (XRD technique), reducibility
(H 2 -TPR), desorption characteristics (O 2 -TPD), surface area (BET method) and the
material morphology by scanning electron microscopy (SEM). Catalytic oxidation