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코발트 이온교환 mordenite 촉매에 의한 O-Xylene 이성질화반응
O-Xylene Isomerization Using Cobalt Ion Exchanged Mordenite
HWAHAK KONGHAK, December 1983, 21(6), 283-292(10), NONE
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Abstract
Cobalt 이온교환된 mordenite를 사용하여 O-Xylene의 이성질화반응을 압력, 촉매의 전처리과정 및 반응분위기를 바꾸어가며 연구하였다.
상압때와 달리 고압에서는 수소 분위기하에서 촉매의 비활성화가 안일어났으며 이성질화선택도가 낮아졌다.
수증기처리한 촉매는 건조공기처리한 촉매에 비하여 활성은 높으나 선택도는 낮아졌음을 보았다.
반응분위기는 coke 형성에 영향을 미쳤다. 압력에 관계없이 질소와 헬륨분위기에서는 수소분위기에 비하여 빠른 비활성화가 일어났으며 1,3,5-TMB의 급격한 감소가 일어나며 그에 따라 1,2,3-TMB도 줄어 들었다.
상압때와 달리 고압에서는 수소 분위기하에서 촉매의 비활성화가 안일어났으며 이성질화선택도가 낮아졌다.
수증기처리한 촉매는 건조공기처리한 촉매에 비하여 활성은 높으나 선택도는 낮아졌음을 보았다.
반응분위기는 coke 형성에 영향을 미쳤다. 압력에 관계없이 질소와 헬륨분위기에서는 수소분위기에 비하여 빠른 비활성화가 일어났으며 1,3,5-TMB의 급격한 감소가 일어나며 그에 따라 1,2,3-TMB도 줄어 들었다.
The isomerization of o-xylene on cobalt-exchanged catalyst was studied by varying the pressure, pretreatment conditions and the reaction atmosphere.
Compared with the low-pressure （1 atm） operation, high pressure operation (180.7 psia) gave lower isomerization selectivity, but no deactivation.
Steam treatment of the catalyst resulted in higher activity and lower selectivity than the dry air treatment.
Reaction atmosphere had an effect on coke formation. Regardless of pressure, nitrogen and helium atmosphere speeded up the deactivation process, and resulted in rapid decrease in 1,3,5-TMB formation and also decreased the amount of 1,2,3-TMB formed.
Compared with the low-pressure （1 atm） operation, high pressure operation (180.7 psia) gave lower isomerization selectivity, but no deactivation.
Steam treatment of the catalyst resulted in higher activity and lower selectivity than the dry air treatment.
Reaction atmosphere had an effect on coke formation. Regardless of pressure, nitrogen and helium atmosphere speeded up the deactivation process, and resulted in rapid decrease in 1,3,5-TMB formation and also decreased the amount of 1,2,3-TMB formed.
