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Volume 4
Nano Research & Applications
ISSN: 2471-9838
JOINT EVENT
October 04-05, 2018 Moscow, Russia
&
2
nd
Edition of International Conference on
26
th
International Conference on
Advanced Nanotechnology
Materials Technology and Manufacturing Innovations
Advanced Nanotechnology 2018
& Materials-Manufacturing 2018
October 04-05, 2018
Page 52
Monica Julieth Valencia Botero
Vaasa Energy Business Innovation Centre, Finland
Monica Julieth Valencia Botero, Nano Res Appl 2018, Volume 4
DOI: 10.21767/2471-9838-C5-020
Transient CO
2
methanation over Rh/CeO
2
-ZrO
2
catalysts
Statement of the Problem:
The CO
2
valorization is one of the main research priorities worldwide. However, the
CO
2
is a thermodynamically stable molecule that requires high-selectivity materials to react. Ceria-based catalysts
have proved to be a suitable option for converting CO
2
into methane, especially the Rh/CeO
2
. After applying a
pretreatment of High Temperature Reduction (HTR) with pure H
2
to 1%Rh/CeO
2
materials, higher amounts of
methane are produced during the transient state. That activity enhancement has been supposed to occur due to the
additional oxygen vacancies (active sites) created after the HTR. The purpose of this study was to get new insights
about the role of oxygen vacancies on the CO
2
activation, by testing materials with improved oxygen storage
capacities.
Methodology & Theoretical Orientation:
Polycristaline CeO
2
, CeO
2
-ZrO
2
and ZrO
2
supports were synthesized
by precipitation/co-precipitation method. 1% Rh was then loaded by incipient wetness impregnation. The samples
were characterized by means of BET surface, XRD, TPR and TGA. The produced methane after both low and high
temperature reduction was followed during 1 hour.
Findings:
As the introduction of zirconium into the ceria lattice enhances the reduction degree of the materials,
higher quantities of methane during the transient state are produced. Therefore, a relationship between the
reduction degree of the CeO
2
-containing materials and the CO
2
conversion was found. However, the additional
oxygen vacancies formed during the treatment are not stable at reaction conditions. Further research is needed in
order to understand the mechanism for which those high-activity sites could be kept.
Recent Publications
1. Westermann A, Azambre B, Bacariza M C, Graça I, Ribeiro M F, Lopes J M and Henriques C (2017) The
promoting effect of Ce in the CO
2
methanation performances on NiUSY zeolite: A FTIR in situ/operando study.
Catalysis Today 283:74-81.
2. Karelovic A and Ruiz P (2013) Mechanistic study of low temperature CO
2
methanation over Rh/TiO
2
catalysts.
Journal of Catalysis 301:141-153.