The C mol. Takeda 5A sieve, natural Mexican clinoptilolite (1) and Mg ions-modified I were used for recovery of CH4 form CH4-N-2 mixts. by pressure swing adsorption under laboratory conditions (1 m column, adsorption pressure 3 bar, desorption vacuum 0.01 mm Hg) to compare the efficiency of i CH 4 enrichment above 90%) ndividual adsorbents. The better results were achieved on the original I (CH, enrichment above 90%) than on the C sieve (CH, enrichment above 85%). The modification of I did not result in any improvement of the sepn. efficiency.