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모더나이트 촉매의 변환이 크실렌의 액상 이성화반응에 미치는 영향
Effect of Mordenite Modification on Liquid Phase Isomerization of Xylene
HWAHAK KONGHAK, October 1984, 22(5), 289-295(7)
https://doi.org/NONE
https://doi.org/NONE
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Abstract
모더나이트를 금속양이온 교환, 염산비등처리 및 수증기 처리하여 산의 성질 또는 결정구조를 변화시킴으로써 크실렌의 액상 이성화반응에 미치는 영향을 조사하였다.
반응은 유통식 고정상 반응기를 이용하였으며 5.8 g Xylene/（hr） (g-cat)의 유량으로 260 ℃, 30기압에서 행하였다. 전이금속 이온교환과 수증기 처리로 상당히 활성저하를 둔화시킬수 있었으며 수증기 처리한 전이금속 이온교환 촉매는 활성유지도가 매우 우수하였다.
반응은 유통식 고정상 반응기를 이용하였으며 5.8 g Xylene/（hr） (g-cat)의 유량으로 260 ℃, 30기압에서 행하였다. 전이금속 이온교환과 수증기 처리로 상당히 활성저하를 둔화시킬수 있었으며 수증기 처리한 전이금속 이온교환 촉매는 활성유지도가 매우 우수하였다.
Modified H-mordenites were prepared and subjected to Xylene isomerization reaction to gain insight into surface chemistry of zeolite catalysis. Modification steps include ion-exchange with transition metal, steam treatment at 500 ℃ and dealumination with boiling hydrochloric acid.
The activity and shape selectivity of those variously treated mordenites on the liquid phase isomerization of xylene were compared with those of the untreated mordenites. The experiments were carried out under the condition of 5.8 g-xylene/（hr）(g-cat) at 260 ℃ and 30 atm.
Mordenites ion-exchanged with Co, Ni, and Fe salts as well as treated with steam at high temperature showed considerable reduction of deactivation. On the contrary the dealuminated mordenites are not effective for the selective isomerization of xylene and rather increase the disproportionation of xylene.
The activity and shape selectivity of those variously treated mordenites on the liquid phase isomerization of xylene were compared with those of the untreated mordenites. The experiments were carried out under the condition of 5.8 g-xylene/（hr）(g-cat) at 260 ℃ and 30 atm.
Mordenites ion-exchanged with Co, Ni, and Fe salts as well as treated with steam at high temperature showed considerable reduction of deactivation. On the contrary the dealuminated mordenites are not effective for the selective isomerization of xylene and rather increase the disproportionation of xylene.
