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- W2022922058 abstract "Abstract New porphyrin-based hybrids materials, (SBA-15)-O-Si-(CH 2 ) 3 -NH-CO-(CH 2 ) 2 -OC-HN-5 m -Etio-III-Ni 2+ and (SBA-15)-O-Si-(CH 2 ) 3 -NH-CO-(CH 2 ) 2 -OC-HN-2- pyrrolic-m -5,10,15,20-TPP-Ni 2+ , were used as heterogeneous catalysts in the esterification reaction of dimethyl terephthalate (DMT) with ethylene glycol (EG) in semi-batch conditions. These results were compared with those obtained for homogeneous catalysis using pure unsupported porphyrins, Etio-III-Ni 2+ and m-5,10,15,20 -TPP-Ni 2+ . The catalytic activity for all systems was determined by measuring the amount of methanol produced during the reaction. The kinetic parameter K was obtained for both processes resulting for the heterogeneous catalyst activation energies of 15.39 kJ/mol for SBA-15-Etio-III-Ni 2+ and 23.77 kJ/mol for SBA-15-TPP-Ni 2+ , while for homogeneous catalysis the activation energies were 10.49 kJ/mol for Etio-III-Ni 2+ and 23.45 kJ/mol for TPP-Ni 2+ . The catalytic efficiencies were determined for both processes resulting that the conversions and the activities were slightly higher for homogeneous processes respect to the heterogeneous ones." @default.
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- W2022922058 date "2011-07-01" @default.
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- W2022922058 title "Homogeneous and heterogeneous catalytic behavior of Ni-porphyrines immobilized in SBA-15 for the esterification of DMT" @default.
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- W2022922058 doi "https://doi.org/10.1016/j.apcata.2011.05.006" @default.
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