Conception d'une chambre de diffraction RX haute temperature pour l'etude de l'adsorption d'un gaz par un solide sous haute pression

摘要

The originality of the present new X-ray reactor chamber is based on its wide range of use for studying solid-gas reactions, especially for condensable gases under high pressure. This chamber constructed in the Laboratory of Research on the Reactivity of Solids of the University of Burgundy, permits studies at wide pressure and temperature ranges from 10~(-4) hPa to 10~4 hPa and from room temperature to 350 ℃ respectively. A beryllium tube mounted on a feedthrough ensures the tightness of the reactor chamber. The sample is heated by conduction. The chamber which is set into an external tight container is fixed on an horizontal axis goniometer connected to a curved X ray position sensitive detector INEL CPS 120. During the experiments a continuous vacuum of approximately 10~(-4) hPa is imposed into the external container equiped with a semi-cylindrical kapton window, to prevent any oxidation of beryllium and any casual outflow of the condensable gas. The X-ray reactor chamber is connected on one side to vacuum and on the other side to a gas reserve. One application of the X-ray reactor chamber is shown from the study of the adsorption and desorption of isopentane on a zeolite 5A under 5 * 10~3 hPa.