Photocatalytic gas preparation demonstration system

A photocatalytic gas preparation demonstration system relates to a gas preparation demonstration system. The system solves the problem that equipment capable of visually displaying the speed and the yield of photocatalytic gas preparation by photocatalyst by the aid of optical energy is unavailable currently. A quartz sealing cover is disposed on an upper port of a reaction vessel and hermetically connected with the reaction vessel, a circulating condensing agent inlet and a circulating condensing agent outlet are disposed on the top of the reaction vessel, a light source is arranged above the quartz sealing cover, the bottom end surface of the reaction vessel is positioned above a magnetic stirrer, an outlet end of the reaction vessel is communicated with one end of a first gas guide tube, the other end of the first gas guide tube is communicated with one end of a dual-rectangle-shaped gas output pipeline in a display cup, a gas dryer is arranged on the first gas guide tube, the other end of the dual-rectang