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Design and synthesis of
nano heterogeneous supported catalysts for olefin
polymerization
S. Tajammul Hussain1*, Rafia Naheed2,
Amin Badshah2 and Tariq Mehmood1
1National
Centre for Physics, Quaid-i-Azam University, Islamabad,
Pakistan.
2Department
of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan.
*Corresponding author. E-mail:
dr_tajammul@yahoo.ca.
Tel: +00-92-51-2601003. Fax: +00-92-51-9064-2241.
Accepted
17 October, 2009. |
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The polymerization
of olefins was studied using heterogeneous cobalt nickel (oxide)
bimetallic catalyst. The prepared catalyst was subjected to
calcination at different temperatures. This treatment results in the
formation of different phases with multiple oxidation states. The
characterization of the catalyst was carried out by XRD, SEM, EDX, TGA,
FTIR and TPR/TPD. The catalytic activity was studied for the
polymerization of butadiene gas in toluene, n-hexane and ethanol in a
Parr reactor system. The products obtained, were characterized by FTIR,
GC/MS, 1H and 13C NMR spectroscopy, Laser Light
Scattering (LLS) and GPC. The best activity was achieved on the catalyst
sample calcined at 1173 K in ethanol solvent. The product contains
aliphatic and aromatic carbonyl compounds and polybutadiene terminated
by OH group. The GPC and LLS studies indicates that polydispersity of
the products are in the narrow range and high molecular weight product.
The study reflects that the catalytic reaction conditions, the
calcinations temperatures which control the oxidation state, phase of
the catalyst and stability of the catalyst are mainly responsible for
the change in products selectivity.
Key words:
Heterogeneous catalysts, bimetallic, olefin polymerization, calcination,
solvents, aliphatic, aromatic products. |
