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<strong>Heterogeneous polymer supported and soluble tantalum metal complex catalysts for acylation reaction: A kinetic study</strong>

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Title Statement <strong>Heterogeneous polymer supported and soluble tantalum metal complex catalysts for acylation reaction: A kinetic study</strong>
 
Added Entry - Uncontrolled Name Murugan, Eagambaram ; Department of Physical Chemistry, School of Chemical Science, University of Madras, Maraimalai Campus, Chennai 600 025, Tamil Nadu, India
Arunachalam, P ; Department of Physical Chemistry, School of Chemical Science, University of Madras, Maraimalai Campus, Chennai 600 025, Tamil Nadu, India
Jebaranjitham, J Nimita ; PG Department of Chemistry, Women’s Christian College (An Autonomous Institution affiliated to University of Madras), College Road, Chennai-600006, Tamil Nadu, India
Santhoshkumar, S Santhoshkumar ; Department of Physical Chemistry, School of Chemical Science, University of Madras, Maraimalai Campus, Chennai 600 025, Tamil Nadu, India.
Saravanakumar, A Saravanakumar ; Department of Applied Science and Technology, Alagappa College of Technology, Anna University, Chennai 600 025, Tamil Nadu, India
 
Uncontrolled Index Term Acylation; Lewis Acid Catalyst; Metal containing polymers; Supported transition metal catalyst; Tantalum Pentachloride Complex
 
Summary, etc. <p><span>New soluble and insoluble Tantalum pentachloride complex catalysts are prepared by simple procedures using pyridine and polymer-supported cross-linked (poly-4-vinyl pyridine) beads (PSCPVP) respectively as supports and Tantalum pentachloride as a catalytic moiety (TaCl5). The prepared soluble Py-TaCl5 and insoluble bead-shaped PSCPVP-TaCl5 catalysts have been characterized with FT-IR, UV-Vis, SEM, TGA and elemental analysis techniques. The catalytic efficiency of these catalysts has been examined through acylation of ethanol as a model reaction under identical pseudo first order reaction condition. From the calculated kobs values, it has been noticed that both the catalysts are active and however, Py-TaCl5shown 1.65 fold has increased activity (kobs =11.42x103 min-1) than insoluble PSCPVP-TaCl5 catalyst (kobs= 6.98x103, min-1). Although, PSCPVP-TaCl5 has shown lesser activity than soluble due to its lower cost, recyclability and reusable nature up to third cycle, it has received greater recognition. Hence, in order to utilize this insoluble bead-shaped PSCPVP-TaCl5 catalyst to pack in column reactor and to carry out the same reaction for continuous mode operation at industrial level, detailed kinetics study for acylation of ethanol has been conducted under pseudo first order condition by varying the different experimental parameters and has observed that each parameter has influenced the reaction. The obtained kobs value reveals that reaction rates increase with the increase in the stirring speed, [substrate], [catalyst] and temperature. The thermodynamic parameters viz., activation energy (Ea), entropy (∆S), enthalpy (∆H) and free energy (∆G#) for the reaction are also calculated for the first time and their observed values are 35.2 kJmol-1, -64.6 kJ-1mol-1, 37.7 kJmol-1and 57.3 kJmol-1 respectively. The prepared insoluble catalyst is stable even after its use for three times in acylation without losing its efficiency, thus it is better suited for industrial applications.</span></p>
 
Publication, Distribution, Etc. Indian Journal of Chemical Technology (IJCT)
2022-10-19 15:20:58
 
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http://op.niscair.res.in/index.php/IJCT/article/view/67621
 
Data Source Entry Indian Journal of Chemical Technology (IJCT); ##issue.vol## 28, ##issue.no## 5 (2021): Indian Journal of Chemical Technology
 
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