As shale gas emerges as a major energy source,CO2 emission from the gas fuel combustion will be a serious problem in the years to come.A hydrate-based CO2 separation technology was proposed,but the cost of high pressure compression has been a roadblock for real world implementation.A promoter is a chemical substance which forms a gas hydrate at a considerably lower pressure,resulting in the improvement of the feasibility of a hydrate-based gas separation process.The exact mechanism of hydrate formation with a promoter,however,is still far from satisfactory,it is desirable to devise a fast and accurate measurement method to screen the best promoter from many candidates.In this study,we report the development of an efficient equipment based on quartz crystal microbalance (QCM),which was originally suggested a decade ago,but has been considered as infeasible.We modified the original equipment using a small quartz crystal (d < 1cm) and a small droplet (2?l).Previously-reported data were reproduced with sufficient accuracy,demonstrating the credibility of our modifications.The time for CO2 hydrate phase equilibrium measurement was reduced to 1/30,comparing with the conventional view cell technique.