Discrimination of the roles of CdSO4 and ZnSO4 in liquid phase hydrogenation of benzene to cyclohexene

Ruthenium‐Catalyzed Selective Hydrogenation of Benzene to Cyclohexene in the Presence of an Ionic Liquid

“…[5,6] Under the aqueous alkaline reaction conditions, leaching is expected, by which ZnO and ZrO 2 enter the liquid phase and then act as additives. [7] Because the use of even larger amounts of Ru catalyst and the high salt load [5] is associated with considerable corrosion problems in the reactor and additional separation steps, the use of such catalyst systems is problematic. Therefore, more research is required.…”

Heterophase-structured nanocrystals as superior supports for Ru-based catalysts in selective hydrogenation of benzene

“…When the temperature reached 150 °C, the line was charged with benzene (140 mL), and the hydrogen pressure was elevated to 5.0 MPa with a stirring rate of 1400  rpm . This is sufficient to eliminate the diffusion effects31. All reactions were carried out under a kinetically-controlled regime, which is demonstrated in section of Mass-Transfer Considerations .…”

“…Many developments of Ru-based heterogeneous catalysts are trying to solve this long-standing problem252627282930. Most studies have enhanced the selectivity via tuning and controlling the catalytic active components, co-catalysts, and additives313233343536. A common view in most researches is that the hydrophilic/hydrophobic properties of the catalysts or supports are of great concern252627282930313233343536.…”

“…Most studies have enhanced the selectivity via tuning and controlling the catalytic active components, co-catalysts, and additives313233343536. A common view in most researches is that the hydrophilic/hydrophobic properties of the catalysts or supports are of great concern252627282930313233343536. To date, relatively little attention has been given to constructing the heterophase structures of the catalysts and tuning the phase structure of supports for more appropriate surface compatibility12.…”

Ruthenium‐katalysierte Selektivhydrierung von Benzol zu Cyclohexen in Gegenwart einer ionischen Flüssigkeit

“…[5,6] Unter den wässrig-alkalischen Reaktionsbedingungen muss zudem von einem Leaching ausgegangen werden, über welches ZnO und ZrO 2 in die Flüssigphase gelangen und dann als die bereits genannten Additive wirken kçnnen. [7] Aufgrund der Verwendung noch grçßerer Mengen an Ru-Katalysator und Salzfracht, [5] verbunden mit erheblichen Korrosionsproblemen der Reaktormaterialien und zusätzlichen Trennaufgaben, ist der Einsatz solcher Katalysatorsysteme problematisch. Hier gibt es also noch weiteren Forschungsbedarf.…”