| Summary: | 碩士 === 逢甲大學 === 化學工程研究所 === 83 === The study uses three different methods,i.e.,the impregnation
method, urea hydrolysis precipitation method and electroless
copper plating, respectively to prepare several copper/alumina
catalysts with different copper loadings. A continuous fixed-
bed microreactor system was used to study the metal interaction
relationship between the catalysts and the alumina support
through the Temperature-Programmed Reduction . It is found that
the unsupported cupric oxide has the largest reduction
temperature at about 330℃. The reduction temperature found for
different alumina supported catalysts are described as below.
For the copper catalyst prepared by electroless copper plating
method, which uses EDTA as the chelating agent, the maximum
reduction temperature is found at about 220℃; after
calcination, the reduction temperature tends to move to lower
temperature, though the change is not large. On the other hand,
the copper catalyst prepared by the same method as the above
but uses TEA as the chelating agent shows maximum reduction
temperature at about 195℃; after calcination , the reduction
temperature exhibits the tendency to move to higher
temperatures with a small change. For copper catalyst prepared
by the impregnation method, the largest reduction temperature
is found to increase from 220-260℃, along with the increase in
the copper loading. For the copper catalyst prepared by the
deposition-precipitation method the largest reduction
temperature is found at about 200℃, which increase with the
increase in the copper loading. The change in the temperature
is not large for the copper prepared from the deposition-
precipitation method, which is similar to the catalyst prepared
in the electroless plating method.
|
|---|
