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.com
Volume 8, Issue 2 (Suppl)
Chem Sci J 2017
ISSN: 2150-3494 CSJ, an open access journal
Euro Chemistry 2017
May 11-13, 2017
May 11-13, 2017 Barcelona, Spain
4
th
European Chemistry Congress
Thanyathon Niyomthai et al., Chem Sci J 2017, 8:2(Suppl)
http://dx.doi.org/10.4172/2150-3494-C1-009Effect of hydrogen on catalytic activity of ziegler-natta catalysts prepared by different methods in ethylene
polymerization
Thanyathon Niyomthai, Bunjerd Jongsomjit
and
Piyasan Praserthdam
Chulalongkorn University, Thailand
E
thylene homopolymerization by two types of Ziegler-Natta catalysts including none-THF and none-EtOH catalysts was
compared. The influences of hydrogen concentrations on surface active sites of these catalysts were investigated based on catalytic
activity. From the results, the EDX analysis and surface area measurement confirmed that none-EtOH catalyst had better active
center distribution than that of none-THF. Thus, the none-EtOH catalyst could retard the hydrogen effect on surface active sites
and show higher activity with increased hydrogen pressures1. However, catalytic activity was lower with high hydrogen pressure. In
addition, to study for more detail about the hydrogen effect, none-THFs were modified with different metal halide additives (AlCl
3
and FeCl
2
). Lewis acid modification can improve activity because it can remove the remaining THF in the final catalyst, which can
poison the catalyst active sites via the ring-opening of THF
2
which was confirmed by FT-IR and XRD measurements. Moreover, the
activity enhancement was due to the formation of acidic sites by modifying the catalysts with Lewis acids. Thus, FeCl
2
doped catalyst
(Fe-THF) exhibited the highest activity followed by AlCl
3
doped catalyst (Al-THF) and undoped catalyst (ZN-THF). In the H
2
/
C
2
H
4
molar ratio of 0.08, Fe-THF showed a better hydrogen response on the surface active sites than Al-THF due to more titanium
clustered distribution. Fe-THF is considered to have more clustered Ti species than Al-THF
3
. As a consequence, it led to obtain more
possible chances to proceed chain transfer reaction by hydrogen.
Biography
Thanyathon studies the doctoral degree of chemical engineering at chulalongkorn university and joined catalysis and catalytic reaction engineering research group
with the Royal Golden Jubilee program of Thailand Research Fund (TRF).
niyomthai.th@gmail.com