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Kinetic Study of Alkoxysilane Hydrolysis under Acidic Conditions by Fourier Transform Near Infrared Spectroscopy Combined with Partial Least-Squares Model
journal contribution
posted on 2014-09-03, 00:00 authored by Qianqian Zhai, Chuanjian Zhou, Shigui Zhao, Cun Peng, Yingchao HanFourier transform near-infrared (FT-NIR)
spectroscopy combined
with a partial least-squares (PLS) model was successfully employed
to study the hydrolysis kinetics of dimethyldiethoxysilane, methyltriethoxysilane,
and tetraethoxysilane in an acid-catalyzed EtOH system. The high scanning
speed and high sensitivity of FT-NIR spectroscopy enabled the new
method to catch the rapid changes of the H2O and EtOH concentrations
without delay, allowing the kinetic behaviors of the hydrolysis reactions
of the specified alkoxysilanes to be investigated. The hydrolysis
processes were found to follow second-order reactions. The hydrolysis
rate constants, activation energies, and Arrhenius frequency factors
were obtained. The FT-NIR PLS results were in good agreement with
those determined by Fourier transform midinfrared spectroscopy. However,
the FT-NIR PLS method was found to be more accurate, because of the
powerful data processing ability of PLS. All of the results suggest
that the FT-NIR PLS model is a valuable tool for performing kinetic
research.
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Keywords
data processing abilityhydrolysis kineticsactivation energieshydrolysis rate constantsKinetic StudyFourier TransformmethodAcidic Conditionsscanning speedEtOH concentrationsH 2Ohydrolysis processesPLSArrhenius frequency factorsmodelInfrared SpectroscopyAlkoxysilane Hydrolysismidinfrared spectroscopyhydrolysis reactions
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