| Summary: | 碩士 === 國立臺灣大學 === 化學工程學系研究所 === 85 === The destruction of VOCs from industrial contaminant is often used
by catalytic oxidation. It costs less to operate at lower temperature since
energy consumption is reduced. The water vapor from reaction can easily
condense in the micropores of metal oxide support at low temperature.
Hence, the surface of metal oxide is cloaked and the activity of catalyst is
significantly reduced. The hydrophobic supported catalyst can be used at
low temperature since water vapor from oxidation can not condense in its
pores. Thus its catalytic activity is not influenced by humid environment.
In this work, SDB ,the hydrophobic polymer(with a surface area of
~500 m2/g and contact angle with water of ~ 109o), and active carbons
were used as support for Pt catalyst by incipient wetness method. The
physical properties of catalysts ,such as specific surface area and Pt
dispersion, were characterized by BET、XRD、H2-TPD、ESCA、
EDS、SEM techniques. We also studied the characteristics of catalyst
before and after reaction. The activity of catalyst was tested by using
different ratio of feed stock (toluene/air) for the deep oxidation. A kinetic
model was proposed to compare the effect of hydrophobicity for the
activity of catalysts. SDB catalyst showed the highest activity under the
test condition at 130℃-150℃and the complete oxidation of 90 ppm
toluene was observed at 150℃.
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