Spontaneous activation behavior of NiSn, an intermetallic catalyst, for hydrogen production via methanol decomposition

Fan, M.*; Xu, Y.*; Sakurai, Junya*; Demura, Masahiko*; Hirano, Toshiyuki*; Teraoka, Yuden; Yoshigoe, Akitaka

International Journal of Hydrogen Energy, 40(37), p.12663 - 12673, 2015/10

https://doi.org/10.1016/j.ijhydene.2015.05.197

The catalytic properties of single-phase NiSn powder in the production of hydrogen via the decomposition of methanol were investigated in isothermal tests at 713, 793, and 873 K. The catalytic activity of NiSn significantly increased with time at 793 and 873 K, but not at 713 K, suggesting that NiSn is spontaneously activated at temperatures above 793 K. At these temperatures, NiSn showed high selectivity for H and CO production and low selectivity for CH, CO, and HO production, indicating that methanol decomposition was the main reaction, and that side reactions such as methanation and water-gas shift reaction were suppressed. Surface analysis revealed that fine NiSn particles were formed during the reaction, accompanied by a small amount of deposited carbon. The formation of these particles was suggested to be the cause for the spontaneous activation of NiSn.

Catalytic performance of NiSn and NiSn for hydrogen production from methanol decomposition

Fan, M.*; Xu, Y.*; Sakurai, Junya*; Demura, Masahiko*; Hirano, Toshiyuki*; Teraoka, Yuden; Yoshigoe, Akitaka

Catalysis Letters, 144(5), p.843 - 849, 2014/05

https://doi.org/10.1007/s10562-014-1212-x

Fundamental study on evaluation of an excavation disturbed zone by measurement of stress using cores and measurement of vibration caused drilling (Joint research)

Oikawa, Yasuki*; Soma, Nobukazu*; Tosha, Toshiyuki*; Matsui, Hiroya; Hirano, Toru*; Tanno, Takeo; Hikima, Ryoichi

JAEA-Research 2010-048, 45 Pages, 2011/02

JAEA-Research-2010-048.pdf:7.68MB

In excavating a gallery or a shaft in deep underground, an excavation disturbed zone (EDZ) develops around the opening with new cracks due to both stress redistribution and excavation induced damage. The investigation and the evaluation of an EDZ are needed because the changes in rock properties and the EDZ development influence performance assessment of geological disposal and design of the underground structures. However, the in situ investigation of an EDZ is time consuming and costly because investigations are large-scale and required specialized equipment. We conducted a fundamental study for the development of an EDZ investigation method that is easy and inexpensive using the information obtained from only drilling. This report describes the results of the joint research carried out in fiscal year 2008 and fiscal year 2009. In Chapter 1, we provide the overview and the background of this study. In Chapter 2, we discuss the estimation of stress state around the research gallery at a depth of 200m in Mizunami Underground Research Laboratory (MIU) by Acoustic Emission / Deformation Rate Analysis (AE/DRA) method using rock cores obtained from the drilling. In Chapter 3, results of the evaluation of geological structure around the research gallery at a depth of 200m in MIU based on Seismic While Drilling (SWD) method using the vibrations caused by the drilling are described.

Mizunami Underground Research Laboratory Project, Annual report for fiscal year 2008

Takeuchi, Shinji; Kunimaru, Takanori; Mikake, Shinichiro; Nishio, Kazuhisa; Tsuruta, Tadahiko; Matsuoka, Toshiyuki; Hayano, Akira; Takeuchi, Ryuji; Saegusa, Hiromitsu; Oyama, Takuya; et al.

JAEA-Review 2010-014, 110 Pages, 2010/07

JAEA-Review-2010-014.pdf:27.34MB

Japan Atomic Energy Agency (JAEA) at Tono Geoscience Center (TGC) is developing a geoscientific research project named Mizunami Underground Research Laboratory (MIU) Project in crystalline rock environment in order to establish scientific and technological basis for geological disposal of HLW. Geoscientific research at MIU is planned to be carried out in three phases over a period of 20 years; Surface-based Investigation Phase (Phase I), Construction Phase (Phase II) and Operation Phase (Phase III). Currently, the project is under the Construction Phase. This document presents the following results of the research and development performed in fiscal year 2008, as a part of the Construction Phase based on the MIU Master Plan updated in 2002, (1) Investigation at the MIU Construction Site and the Shobasama Site, (2) Construction at the MIU Construction Site, (3) Research Collaboration.

Mizunami Underground Research Laboratory Project, Annual report for fiscal year 2007

Nishio, Kazuhisa; Matsuoka, Toshiyuki; Mikake, Shinichiro; Tsuruta, Tadahiko; Amano, Kenji; Oyama, Takuya; Takeuchi, Ryuji; Saegusa, Hiromitsu; Hama, Katsuhiro; Mizuno, Takashi; et al.

JAEA-Review 2009-002, 88 Pages, 2009/03

JAEA-Review-2009-002-1.pdf:29.31MB
JAEA-Review-2009-002-2.pdf:35.38MB

Japan Atomic Energy Agency (JAEA) at Tono Geoscience Center (TGC) is developing a geoscientific research project named Mizunami Underground Research Laboratory (MIU) Project in crystalline rock environment in order to establish scientific and technological basis for geological disposal of HLW. Geoscientific research at MIU is planned to be carried out in three phases over a period of 20 years; Surface-based Investigation Phase (Phase I), Construction Phase (Phase II) and Operation Phase (Phase III). Currently, the project is under the Construction Phase. This document presents the following results of the research and development performed in 2007 fiscal year, as a part of the Construction Phase based on the MIU Master Plan updated in 2002, (1) Investigation at the MIU Construction Site and the Shobasama Site, (2) Construction at the MIU Construction Site, (3) Research Collaboration.

Stress measurement using rock core in the deep shaft

Oikawa, Yasuki*; Soma, Nobukazu*; Tosha, Toshiyuki*; Hirano, Toru; Matsui, Hiroya

no journal, , 

no abstracts in English

Mizunami Underground Research Laboratory Project, 3; Major outcomes from characterization of geological environment and further plan

Tsuruta, Tadahiko; Hama, Katsuhiro; Ogata, Nobuhisa; Matsui, Hiroya; Takeuchi, Shinji; Hirano, Toru; Takeuchi, Ryuji; Saegusa, Hiromitsu; Matsuoka, Toshiyuki; Mizuno, Takashi

no journal, , 

no abstracts in English

Stress measurement using rock cores around the ventilation shaft in Mizunami Underground Research Laboratory

Oikawa, Yasuki*; Soma, Nobukazu*; Tosha, Toshiyuki*; Matsui, Hiroya; Tanno, Takeo; Hirano, Toru*

no journal, , 

Acoustic Emission / Deformation Rate Analysis method (AE/DRA method) is a stress measurement method that uses test pieces cut from a drilled rock core. These test pieces are examined in a laboratory with cyclic-loading tests to measure stress along an axial direction in the original rock mass. We have conducted a basic research on a simple and low-cost estimation method to characterize the rock within the excavated damage zone using data from the investigation with a borehole (including drilling) most effectively. Here, we conducted AE/DRA stress measurement using rock cores provided from the Mizunami underground research laboratory's gallery at -200 m depth. Measured each stress data were varied even if in a same direction but estimated 3-D directions of 1 located in EW(NW-SE)NS range. This generally matches to the hydrofrac stress measurement data conducted near the Mizunami laboratory. A lot of stress data obtained from AE/DRA method and a flexible stress inversion method cause to estimate stable 3-D stress fields.

Catalytic performance and characterization of NiAl rolled foil catalysts for steam reforming of methane

Xu, Y.*; Ma, Y.*; Demura, Masahiko*; Hirano, Toshiyuki*; Teraoka, Yuden; Yoshigoe, Akitaka

no journal, , 

no abstracts in English

Catalytic properties of NiAl foils for methane steam reforming

Xu, Y.*; Ma, Y.*; Sakurai, Junya*; Demura, Masahiko*; Hirano, Toshiyuki*; Teraoka, Yuden; Yoshigoe, Akitaka

no journal, ,