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E u r o s c i c o n C o n f e r e n c e o n
Physical Chemistry and
Analytical Separation Techniques
October 08-09 , 2018
Amsterdam, Nether l ands
Journal of Organic & Inorganic Chemistry
ISSN: 2472-1123
Physical Chemistry and Analytical Separation Techniques 2018
T
he electrochemical reduction of CO
2
offers one of the possible solutions to
current energy and sustainability issues since it can sequester carbon from
the atmosphere and can be used to produce fuels and useful chemicals. In this
respect, some metalloporphyrins have been reported to catalyse the electro
reduction of CO
2
. However, key issues still remain in regard to the elucidation
of the effect of the porphyrin structure on the reaction mechanism and catalyst
activity. An essential and necessary stage in the proposed mechanism for the
catalytic reduction of CO
2
by the Co(II)/Co(I) porphyrin redox couple is the
formation of an intermediate Co(II)porphyrin-CO
2
- complex. In an attempt to
examine the effect of positively and negatively charged porphyrin substituents
on the catalytic activity, we report here on a combined density functional theory
(DFT) and empirical study regarding the electrochemical reduction of CO
in
the presence of the Cobalt(II) 5,10,15,20-(tetra-N-methyl-4-pyridyl) porphyrin
- Co(II)TMPyP and Cobalt(II) 5,10,15,20-(tetra-4-sulfonatophenyl) porphyrin
–
Co(II)TPPS
complexes, with charges of +4 and -4, respectively. The lower
catalytic activity of the CoTPPS complex as compared to that of CoTMPyP,
both dissolved in aqueous alkaline solutions, as demonstrated by cyclic
voltammetry experiments, are in agreement with the DFT study. Columbic
interactions seem to dictate the cobalt-carbon bond length and strength in the
porphyrin-CO
2
intermediate, and consequently have an impact on its stability
and on the overall catalytic activity towards CO
2
reduction
Biography
YeshayahuBenEliyahuhasreceivedallhisdegrees inChemistry
from the Hebrew University of Jerusalem. His MSc and PhD
theses were done under the supervision of the late Prof Yehuda
Haas from the Physical Chemistry Department. He is working in
the NRCN, Department of Chemistry since 1995. He has served
as the Head of Department of Chemistry in NRCN from 2010-
2013 and as the Head of Nuclear Engineering Department in
the IAEC from 2013-2018. Now he is on Sabbatical in the
Department of Chemical Engineering in Ben-Gurion University
of the Negev in Israel.
beneliye@post.bgu.ac.ilComputational and empiric considerations regarding the
electro catalytic reduction of CO2 by water soluble cobalt
porphyrins
Yeshayahu Ben Eliyahu
1, 2
, Y Bochlin
1
, S Kozuch
1
, E Korin
1
and A Bettelheim
1
Ben-Gurion University of the Negev, Israel
2
Nuclear Research Center NEGEV, Israel
Yeshayahu Ben Eliyahu et al., J Org Inorg Chem 2018 Volume: 4
DOI: 10.21767/2472-1123-C6-017
Figure 1:
Calculated CoTMPyP-CO2 complex, top and side views