JOPSS - Search Results

Journal Articles

Effect of dissolved oxygen concentration on dynamic strain aging and stress corrosion cracking of SUS304 stainless steel under high temperature pressurized water

Hirota, Noriaki; Nakano, Hiroko; Fujita, Yoshitaka; Takeuchi, Tomoaki; Tsuchiya, Kunihiko; Demura, Masahiko*; Kobayashi, Yoshinao*

The IV International Scientific Forum "Nuclear Science and Technologies"; AIP Conference Proceedings 3020, p.030007_1 - 030007_6, 2024/01

https://doi.org/10.1063/5.0192888

Dynamic strain aging (DSA) and intergranular stress corrosion cracking (intragranular SCC) occur in high temperature pressurized water simulating a boiling water reactor environment due to changes in dissolved oxygen (DO) content, respectively. In order to clearly understand the difference between these phenomena, the mechanism of their occurrence was summarized. As a result, it was found that DSA due to intragranular cracking occurred in SUS304 stainless steel at low DO 1 ppb, while DSA was suppressed at DO 100 to 8500 ppb due to the formation of oxide films on the surface. On the other hand, when DO was increased to 20000 ppb, the film was peeled from the matrix, O element diffused to the grain boundary of the matrix, resulting in intergranular SCC. These results are indicated that the optimum DO concentration must be adjusted to suppress crack initiation due to DSA and intergranular SCC.

Journal Articles

Spontaneous activation behavior of Ni $_{3}$ Sn, 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

Times Cited Count：13 Percentile：32.98(Chemistry, Physical)

The catalytic properties of single-phase Ni $_{3}$ Sn 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 Ni $_{3}$ Sn significantly increased with time at 793 and 873 K, but not at 713 K, suggesting that Ni $_{3}$ Sn is spontaneously activated at temperatures above 793 K. At these temperatures, Ni $_{3}$ Sn showed high selectivity for H $_{2}$ and CO production and low selectivity for CH $_{4}$ , CO $_{2}$ , and H $_{2}$ O 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 Ni $_{3}$ Sn 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 Ni $_{3}$ Sn.

Journal Articles

Effect of water vapor and hydrogen treatments on the surface structure of Ni $_{3}$ Al foil

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

Applied Surface Science, 315, p.475 - 480, 2014/10

https://doi.org/10.1016/j.apsusc.2014.02.144

Times Cited Count：7 Percentile：31.93(Chemistry, Physical)

Journal Articles

Catalytic performance of Ni $_{3}$ Sn and Ni $_{3}$ Sn $_{2}$ 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

Times Cited Count：14 Percentile：34.71(Chemistry, Physical)

Oral presentation

Catalytic performance and characterization of Ni $_{3}$ Al 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

Oral presentation

Catalytic performance of Ni $_{3}$ Sn alloy for hydrogen production from methanol decomposition

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

no journal, ,

Oral presentation

Catalytic properties of Ni $_{3}$ Al foils for methane steam reforming

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

no journal, ,

Oral presentation

Effect of steam treatments on surface morphology of Ni $_{3}$ Al foil catalysts

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

no journal, ,

Oral presentation

Oxidation of Ni $_{3}$ Al(210) surface at room temperature using supersonic oxygen molecular beam; Real-time photoemission spectroscopic study with synchrotron radiation

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

no journal, ,

Oral presentation

Initial oxidation behavior of Ni $_{3}$ Al(210) surface induced by supersonic oxygen molecular beam at room temperature

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

no journal, ,

The initial oxidation behavior of a clean Ni $_{3}$ Al (210) surface was studied at 300 K using a supersonic O $_{2}$ molecular beam (O $_{2}$ SSMB) having an O $_{2}$ translational energy of 2.3 eV, and real-time photoemission spectroscopy performed with high-brilliance synchrotron radiation. The evolution behaviors of the O 1s, Ni 2p, Al 2p, and Ni 3p spectra were examined over time during irradiation with the O $_{2}$ SSMB. The spectral analysis revealed that both the Al atoms and the Ni atoms on the surface were oxidized; however, the oxidation of Al progressed much faster than that of Ni.

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Effect of dissolved oxygen concentration on dynamic strain aging and stress corrosion cracking of SUS304 stainless steel under high temperature pressurized water

Spontaneous activation behavior of Ni $_{3}$ Sn, an intermetallic catalyst, for hydrogen production via methanol decomposition

Effect of water vapor and hydrogen treatments on the surface structure of Ni $_{3}$ Al foil

Catalytic performance of Ni $_{3}$ Sn and Ni $_{3}$ Sn $_{2}$ for hydrogen production from methanol decomposition

Catalytic performance and characterization of Ni $_{3}$ Al rolled foil catalysts for steam reforming of methane

Catalytic performance of Ni $_{3}$ Sn alloy for hydrogen production from methanol decomposition

Catalytic properties of Ni $_{3}$ Al foils for methane steam reforming

Effect of steam treatments on surface morphology of Ni $_{3}$ Al foil catalysts

Oxidation of Ni $_{3}$ Al(210) surface at room temperature using supersonic oxygen molecular beam; Real-time photoemission spectroscopic study with synchrotron radiation

Initial oxidation behavior of Ni $_{3}$ Al(210) surface induced by supersonic oxygen molecular beam at room temperature