Since the physical sorption of {TAIL ~ HCl} is generally thought to be a surface phenomenon and {HEAD ~ the presence} of HCl on the surface of the sorbent would tend to catalyze the polymerization of hydrocarbon, it is surprising that the HCl sorbents of the present invention show such a low catalytic activity 
Since the physical sorption of { TAIL ~ HCl } is generally thought to be a surface phenomenon and { HEAD ~ the presence } of HCl on the surface of the sorbent would tend to catalyze the polymerization of hydrocarbon , it is surprising that the HCl sorbents of the present invention show such a low catalytic activity
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