| Summary: | 博士 === 國立臺灣大學 === 環境工程研究所 === 82 === In this work, adsorption and catalytic incineration of the
dilute methylene chloride (METH) and 1,1,1-trichloroethane
(TCEA) vapors in air were investigated by using
activated carbons (BPL/PCB) and chromium oxide catalyst,
respectively. The experimental results of activated
carbon adsorption indicate that the adsorption of the target
VOC onto the activated carbons BPL and PCB has been found to
well follow the Langmuir, Freundlich, and Dubinin-
Radushkevich (D-R) equations. The above results of the
ability and capacity of adsorption are consistent with the
relationships between the Langmuir adsorption
equilibrium constant and adsorption temperature. The
experimental results also indicate that a higher relative
humidity evidently decreases the adsorption capacity,
especially for the activated carbon BPL. All the results can
be reasonably explained by the measured physical and
chemical properties of the activated carbons, and the
properties of the adsorbates. The experimental results of
catalytic incineration indicate that the reaction
temperature is a determining factor in the catalytic
incineration. The catalytic oxidation reaction of TCEA may
be divided into two stages. The first stage is a 1,
2-elimination reaction, forming the intermediate
product 1,1-dichloroethylene (DCE). The second stage is
the complete catalytic oxidation of DCE, forming the
oxidation products such as CO2, HCl, etc. The experimental
results may be reasonably fitted by using the pseudo-
first-order reaction kinetic equatiion, and activation
energies were obtained therefore. No phosgene was detected.
Further, reaction mechanisms were proposed to qualitatively
explain the experimental results. properties of carbons, and
the properties of the adsorbates.
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