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A carbon molecular sieve (CMS) was prepared from broom corn stalk as a low cost precursor by carbon vapor deposition of methane. The base activated carbon (AC) was produced from the broom corn stalk using ZnCl2 as the chemical activating agent. To produce the CMS, the pore structure of the AC prepared at the optimized condition was modified by chemical vapor deposition of methane. The CO2 and CH4...