Temperature and Pressure Dependence of Anomalous Heat Generation Occurring in Hydrogen Gas Absorption by Metal Powder

Tomotaka Kobayashi*, Junsuke Shigemura, Ken Naitoh, Yutaka Mori, Reiko Seto, Joji Hachisuka

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


As reported in previous papers, anomalous heat generation occurs when nickel or palladium powder is exposed to hydrogen or deuterium gas, while there is also a chemical effect that occurs when hydrogen (or deuterium) gas is absorbed by mixed oxides of Pd and Zr. Many experiments were previously conducted while increasing either initial temperature or pressure in the reaction chamber. In this report, we conducted fundamental experiments of hydrogen gas absorption by metal powder, while increasing both temperature and pressure simultaneously. The experiments were conducted in conditions up to 244°C and 0.5 MPa, using a small constant-volume reaction system developed by us. As a result, about 4 K of temperature rise was observed in the experiment using nickel powder, and about 10 K was observed in the experiment using Pd-Ni-Zr composite powder. In these experimental results, there are positive correlations between the temperature rise and both the initial temperature and loaded gas pressure. This result may show that the temperature rise is assisted by not only preheating but also gas absorption under higher pressure.

Original languageEnglish
Pages (from-to)318-326
Number of pages9
JournalJournal of Condensed Matter Nuclear Science
Publication statusPublished - 2022
Event23rd International Conference on Condensed Matter Nuclear Science, ICCF 2021 - Virtual, Online, China
Duration: 2021 Jun 92021 Jun 11


  • Anomalous heat
  • Gas absorption
  • Pressure dependence
  • Temperature dependence

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Condensed Matter Physics


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