成果報告書詳細
管理番号20160000000586
タイトル*平成27年度中間年報 エネルギー・環境新技術先導プログラム 多孔質材料と金属触媒との革新的複合化技術による高性能水素貯蔵材料の研究
公開日2016/7/7
報告書年度2015 - 2015
委託先名パナソニック株式会社 国立大学法人北海道大学
プロジェクト番号P14004
部署名イノベーション推進部
和文要約
英文要約Title: Energy and Environment New Technology Leadership Program: Study of High-Performance Hydrogen Storage Materials by Innovative Composite Technology of Porous Material and Metal Catalyst (FY2015-FY2016) FY2015 Annual Report

We investigated the design of composite material which has the hydrogen storage capability beyond 6 wt%, and the high hydrogen desorption capability at 100°C or less for the application to a fuel-cell vehicle (FCV) and a home power supply (ENE-FARM).
Hydrogen adsorption material was produced by carrying out Pd ionic exchange to Zeolite 13X powder with a commercial particle, which have average particle diameter of 5 μm. Hydrogen adsorption isotherm measurement and high-pressure hydrogen PCT measurement were carried out to investigate the amount of hydrogen adsorption of these particles. In addition, XAFS analysis was also carried out to find out the Pd catalytic mechanism.
Hydrogen adsorption at 77K indicated that Pd-13X system of the amount of adsorption became less than 13X. On the other hand, Pd metal or PdO did not adsorb hydrogen at all. These things showed that a certain amount of temperature was needed for demonstrate a Pd catalytic action. Further, XAFS analysis in a hydrogen exposure process showed that Pd form a cluster in the early stage of hydrogen exposure, and that hydrogen gathered around Pd by progress of time of exposure. It is seemed that the catalytic action by formation of Pd cluster cause the spillover phenomenon and deviation adsorption of hydrogen.
 Hydrogen adsorption and desorption characteristics at 25°C were investigated for Pd-doped Zeolite 13X and Pd-doped carbon. The specimens were weighted after a well evacuation at 400°C. An efficient H2 adsorption was recognized in the H2 pressure region below 100 kPa. There were two steps of adsorption and desorption behaviors in the low pressure range between 0.01-100 kPa, which were respectively attributed to the physical and chemical adsorption and desorption of H2 molecules. The XPS analysis exemplified a charge state between zero and 2+ for Pd in the zeolite, which is expected to be a preferable state for Pd to attain highly efficient H2 storage materials.
 In the future, we are planning to develop porous materials that have the required store release capacity by using the nano-zeolite particles and so on, and to analyze the mechanism of Pd catalytic action in the porous material.
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