| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程研究所 === 83 === The differences among Cr2O3/*-Al2O3, MnO2/Al2O3 and CuO/Al2O3
catalysts for the decomposition of trichloroethane were
investigated. These catalysts were prepared by incipient
impregnation and were characterized by BET surface, pore size,
ESCA and ammonia adsorption. The decomposition was conducted
under atmospheric pressure with the trichloroethane being
continuously carried to the reactor with an air flow. CuO/Al2O3
appeared as the most active catalyst among the three for the
decompostion. The reaction produced ethylene dichloride as an
intermediate for all three catalysts. Further decomposition of
ethylene dichloride into CO and CO2 was also examined. Cr2O3/Al2
O3 was the most active catalyst for this reaction, relating
possibly to the catalyst''s high number of acid site.The
reaction path for the productions of CO and CO2 varied withthe
catalysts as demonstrated by the relation between the contact
time and the selectivity. CO and CO2 were produced in sequence
on Cr2O3/Al2O3 while these gases were yielded simultaneously on
CuO/Al2O3 and MnO2/Al2O3. The selectivity of HCl and Cl2 was
found to altered with the reaction temperature. Increasing the
temperature resulted in a higher selectivity of chlorine.
Phosgene was produced from the reaction between CO and Cl2.This
toxic gas was found in the decomposition using CuO/Al2O3 as the
catalyst but was not discovered using MnO2/Al2O3 and Cr2O3/Al2
O3.
|
|---|
