Gas hydrates are crystalline solids composed of water and gas molecules. Water molecules are linked through hydrogen bonding and create cavities(host lattice) that can capture a large variety of guest molecules under appropriate conditions, generally high pressure and low temperature. Recently, many researchers try to apply gas hydrates to industrial processes to capture greenhouse gases due to the facts that the process is eco-friendly and target gas molecules can be preferentially captured. In this paper, we introduced recent studies on CO2 and CO2-N2 mixture hydrates to evaluate the feasibility of industrial application of gas hydrate technology to CO2 capture process. Specifically, we put emphasis on the technical feasibility of CO2 separation in steel industry using gas hydrate formation principles.