Catalytic activity for dehydration and dehydrogenation of isopropyl alcohol over the pigments was measured by a microcatalytic reactor to determine the acidic sites and/or the basic sites on the pigments. The pigments were classified into four groups by the reaction products of isopropyl alcohol as follows;
Group 1. The type of pigments which mainly produces propylene.
Group 2. What mainly produces acetone.
Group 3. What forms both acetone and propylene.
Group 4. What does not decompose isopropyl alcohol.
In order to find the structure of active sites, organic compounds such as pyridine and acetic acid were added to the pigments, and the decomposition of isopropyl alcohol was measured. After the comparison of the activity with that before the addition, the reaction mechanisms were discussed.
From these results, the decomposition process can be classified into the following three types.
1. Only acidic sites act to the dehydration.
2. Although acidic sites mainly act, basic sites are also concerned with dehydration.
3. Although basic sites mainly act, acidic sites are also concerned with dehydrogenation.
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