Anomalous Volume Changes in the Siliceous Zeolite Theta-1 TON due to Hydrogen Insertion under High-Pressure, High-Temperature Conditions.

摘要: High-pressure X-ray diffraction and Raman spectroscopy in a diamond anvil cell were used to study the insertion of chemical hydrogen storage material, ammonia borane, one-dimensional pores zeolite theta-1 TON. Heating this material up 300 °C under pressures 5 GPa resulted release significant amount due conversion borane confined channels TON outside polyaminoborane then polyiminoborane chains. The filling with much greater increase unit volume than that corresponding thermal expansion normal compact inorganic solids. This process at high temperature is accompanied by phase transition from collapsed high-pressure Pbn21 form more symmetric Cmc21 expanded pores. has capacity for adsorption high-temperature, conditions.