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Rh/α-Al2O3 촉매상에서 벤젠의 기상수소화반응

Gas Phase Hydrogenation of Benzene on A Rh/α-Al2O3 Catalyst

HWAHAK KONGHAK, June 1981, 19(3), 169-176(8), NONE
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Abstract

연속식 미분 반응기를 사용하여 반응온도를 323 K에서 536.5 K까지 변화시키면서 α-알루미나를 담체로 한 Rh촉매상에서 대기압하의 벤젠의 기상 수소화반응을 행하였다.
반응의 주 생성물은 사이클로헥산이었으며 사이클로헥센은 무시할 수 있을 정도의 미량이었다. 활성화에너지는 383 K 이하의 반응온도에서 48.1 kJ/mol이었고, 473 K 이상의 반응온도에서는 -62.8 kJ/mol이었다. 최대 반응속도가 나타나는 현상과 제안된 반응기구를 고찰하였으며, 최대 반응속도를 나타내는 온도는 수소분압이 96 kPa일 때 453 K였고, 24 kPa일 때는 408 K였다.
The kunetics of benzene hydrogenation over a rhodium-αalumina catalyst was studied in a differential flow reactor with temperature range from 323 K , benzene partial pressures from 0.67 kPa to 5.33 kPa and hydrogen partial pressures from 24 kPa to 96 kPa. The main reaction product was cyclohexane and some cyclohexene was detected byt its amount was very small to be neglected. The apparent activation energies of the hydrogenation reaction appeared 48.1 kJ/mol in the temperature range of 323-383 K, and unusually 62.8 kJ/mol between 473-536.5 K revealing the existence of maximum rate at certain temperature range. The temperature of the maximum rate shifted from 453oK at 96 kPa hydrogen pressures to 408 K at 24 kPa. All these phenomena are examined and the reaction mechanism also suggested.

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