A study on a dry type alkali sorbent has been conducted for the purpose of reducing the corrosion on gas turbine blades with alkali vapor in Direct Coal Fired. Turbines (DCFT) system using a Pressurized Coal Partial Combustor (PCPC). Kaolinite and zeolite were found to be very effective for capturing the NaCl vapor. It is also found that coexistent gases such as H2O and H2S promote the NaCl vapor capture on kaolinite whereas HCl gas suppresses it. The amount of Na captured on kaolinite is estimated to be around 30 mass % of kaolinite. From instrumental analysis of kaolinite using X-ray Photoelectron Spectroscopy (XPS) and X-ray Diffraction (XRD), it is found that the Na is mostly captured on kaolinite by chemical adsorption and chemical reaction.