SLCMS-cbg1 is a type of adsorbent for methane gas enrichment , designed for use with pressure swing adsorption process (PSA) purification of methane gas. Has the advantage of high concentration of methane gas enrichment, high product recovery. Different adsorbent surface diffusion rate is the primary mechanism for gas separation, the methane gas substantially no absorption, and other small molecules adsorbed gas such as nitrogen, carbon dioxide. This feature allows a PSA process becomes more convenient and efficient.