Adsorption　and　desorption　of　carbon　dioxide,　methane　and　other　gases　on　coals　has　been　investigated　experimentally　using　representative　Zhongliangshan　coals.　Gas　adsorption　is　one　of　the　major　concerns　for　both　CO2　sequestration　and　methane　recovery　processes.　The　experiments　were　carried　out　using　both　single　and　multi-component　mixtures　at　25　°C　and　30　°C　with　the　highest　pressure　of　12　MPa.　The　coal　was　under　moisture　equilibrated　conditions.　This　provides　experimental　data　from　which　a　predictive　assessment　of　CO2　sequestration　and/or　methane　recovery　can　be　conducted.　The　results　show　that　for　pure　gasses　the　CH4　adsorption　capacity　is　higher　than　the　N2　adsorption　capacity　but　lower　than　the　CO2　adsorption　capacity.　Injection　of　CO2　or　other　gases　into　the　coal　significantly　affects　CH4　desorption.　This　allows　the　enhancement　of　CH4　recovery　from　the　coals,　thus　supplying　more　clean　energy　while　sequestering　significant　amounts　of　CO2　thereby　reducing　the　greenhouse　effect　from　human　beings.　©　2009　China　University　of　Mining　and　Technology.