Evaluating the effects of OH-groups on the Ni surface on low-temperature steam reforming in an electric field

Kaho Nagakawa; Hiroshi Sampei; Ayako Takahashi; Jun Sasaki; Takuma Higo; Naoya Mori; Hideto Sato; Yasushi Sekine

doi:10.1039/d2ra04974k

Evaluating the effects of OH-groups on the Ni surface on low-temperature steam reforming in an electric field

Kaho Nagakawa, Hiroshi Sampei, Ayako Takahashi, Jun Sasaki, Takuma Higo, Naoya Mori, Hideto Sato, Yasushi Sekine^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

The effect of OH-groups on the surface of a Ni catalyst for low-temperature (473 K) steam reforming of methane in an electric field (EF) was investigated. Ni-doped YSZ (Zr_0.65Y_0.05Ni_0.3O₂) was chosen as a highly active catalyst for this purpose. The effects on catalyst activity of adding hydrogen and steam in the pre-treatment were assessed with and without EF. When an EF was applied, activity increased irrespective of the electronic state of Ni, whereas the metallic Ni state was necessary for activity without EF. Furthermore, the highest activity with EF was observed for the pre-treatment with a mixture of H₂ and H₂O. Investigation of the superiority using XPS measurements showed an increase in the amount of Ni(OH)₂, OH groups and H₂O near the surface after the activity test, which are regarded as the reaction sites with EF. This finding suggests that a pre-treatment with steam increases the surface OH groups and Ni(OH)₂ on the Ni catalyst, and enhances surface proton conduction, thereby improving the activity.

Original language	English
Pages (from-to)	25565-25569
Number of pages	5
Journal	RSC Advances
Volume	12
Issue number	39
DOIs	https://doi.org/10.1039/d2ra04974k
Publication status	Published - 2022 Sept 7

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering

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@article{4b63193520f941afb50e9589c5858c1a,

title = "Evaluating the effects of OH-groups on the Ni surface on low-temperature steam reforming in an electric field",

abstract = "The effect of OH-groups on the surface of a Ni catalyst for low-temperature (473 K) steam reforming of methane in an electric field (EF) was investigated. Ni-doped YSZ (Zr0.65Y0.05Ni0.3O2) was chosen as a highly active catalyst for this purpose. The effects on catalyst activity of adding hydrogen and steam in the pre-treatment were assessed with and without EF. When an EF was applied, activity increased irrespective of the electronic state of Ni, whereas the metallic Ni state was necessary for activity without EF. Furthermore, the highest activity with EF was observed for the pre-treatment with a mixture of H2 and H2O. Investigation of the superiority using XPS measurements showed an increase in the amount of Ni(OH)2, OH groups and H2O near the surface after the activity test, which are regarded as the reaction sites with EF. This finding suggests that a pre-treatment with steam increases the surface OH groups and Ni(OH)2 on the Ni catalyst, and enhances surface proton conduction, thereby improving the activity.",

author = "Kaho Nagakawa and Hiroshi Sampei and Ayako Takahashi and Jun Sasaki and Takuma Higo and Naoya Mori and Hideto Sato and Yasushi Sekine",

note = "Funding Information: We appreciate Dr Tetsuo Homma and Dr Takeshi Watanabe (Japan Synchrotron Radiation Research Institute, SPring-8) for their great support with XAFS measurements in BL14B2. We also appreciate Prof. S. Yamazoe (Tokyo Metropolitan Univ.) for his great support with XAFS analyses. Publisher Copyright: {\textcopyright} 2022 The Royal Society of Chemistry.",

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T1 - Evaluating the effects of OH-groups on the Ni surface on low-temperature steam reforming in an electric field

AU - Nagakawa, Kaho

AU - Sampei, Hiroshi

AU - Takahashi, Ayako

AU - Sasaki, Jun

AU - Higo, Takuma

AU - Mori, Naoya

AU - Sato, Hideto

AU - Sekine, Yasushi

N1 - Funding Information: We appreciate Dr Tetsuo Homma and Dr Takeshi Watanabe (Japan Synchrotron Radiation Research Institute, SPring-8) for their great support with XAFS measurements in BL14B2. We also appreciate Prof. S. Yamazoe (Tokyo Metropolitan Univ.) for his great support with XAFS analyses. Publisher Copyright: © 2022 The Royal Society of Chemistry.

PY - 2022/9/7

Y1 - 2022/9/7

N2 - The effect of OH-groups on the surface of a Ni catalyst for low-temperature (473 K) steam reforming of methane in an electric field (EF) was investigated. Ni-doped YSZ (Zr0.65Y0.05Ni0.3O2) was chosen as a highly active catalyst for this purpose. The effects on catalyst activity of adding hydrogen and steam in the pre-treatment were assessed with and without EF. When an EF was applied, activity increased irrespective of the electronic state of Ni, whereas the metallic Ni state was necessary for activity without EF. Furthermore, the highest activity with EF was observed for the pre-treatment with a mixture of H2 and H2O. Investigation of the superiority using XPS measurements showed an increase in the amount of Ni(OH)2, OH groups and H2O near the surface after the activity test, which are regarded as the reaction sites with EF. This finding suggests that a pre-treatment with steam increases the surface OH groups and Ni(OH)2 on the Ni catalyst, and enhances surface proton conduction, thereby improving the activity.

AB - The effect of OH-groups on the surface of a Ni catalyst for low-temperature (473 K) steam reforming of methane in an electric field (EF) was investigated. Ni-doped YSZ (Zr0.65Y0.05Ni0.3O2) was chosen as a highly active catalyst for this purpose. The effects on catalyst activity of adding hydrogen and steam in the pre-treatment were assessed with and without EF. When an EF was applied, activity increased irrespective of the electronic state of Ni, whereas the metallic Ni state was necessary for activity without EF. Furthermore, the highest activity with EF was observed for the pre-treatment with a mixture of H2 and H2O. Investigation of the superiority using XPS measurements showed an increase in the amount of Ni(OH)2, OH groups and H2O near the surface after the activity test, which are regarded as the reaction sites with EF. This finding suggests that a pre-treatment with steam increases the surface OH groups and Ni(OH)2 on the Ni catalyst, and enhances surface proton conduction, thereby improving the activity.

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Evaluating the effects of OH-groups on the Ni surface on low-temperature steam reforming in an electric field

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