Bulletin of the Chemical Society of Japan p. 965 - 970 (1982)
Update date:2022-08-16
Topics:
Furuyama, Shozo
Murashita, Osamu
Ichisaka, Kotomasa
Morimoto, Tetsuo
The technique of hydrothermal activation was used to prepare well-mixed and fully hydroxylated silica-alumina catalyst, SA-nMHT (n=13, 25, or 50 denotes the alumina content (wt percent)).Their catalytic activities and cis/trans selectivities for the 1-butene isomerization (k1 and c/t), the catalytic activities for the 1-butene polymerization (kp), the amount of acid (A), and the number of the surface hydroxyl group (NOH) were measured as a function of the degassing temperature (Td) over the 25-700 deg C range; the following results were obtained: (1) k1 changed prominently with Td and reached its maximum around 300 deg C. (2) c/t was about 0.9 below 500 deg C, but exceeded 1.2 at 700 deg C. (3) kp increased till 300 deg C and became constant above that temperature. (4) A was almost independent of Td above 100 deg C. (5) NOH decreased from 11-15 (at 100 deg C) to 0.5 group nm-2 (at 700 deg C).An analysis of these data led to the conclusion that the SA-nMHT sample underwent the surface structural changes three times during the thermal dehydroxylation between 25 and 700 deg C.The sequence of structural change was sketched, and the different dependecies upon Td of k1, kp and A were explained.
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