Commonly used sorbents include activated charcoal, silica gel, and organic porous polymers such as Tenax and Amberlite XAD resins.
2.
The reaction is catalyzed by Lewis acids such as tin tetrachloride and scandium ( III ) triflate and Br�nsted acids such as " p "-toluenesulfonic acid, perchloric acid, amberlite and iodine.
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