Anchoring Bond between Ru and N Atoms of Ru/Ca2NH Catalyst: Crucial for the High Ammonia Synthesis Activity

Hitoshi Abe; Yasuhiro Niwa; Masaaki Kitano; Yasunori Inoue; Masato Sasase; Takuya Nakao; Tomofumi Tada; Toshiharu Yokoyama; Michikazu Hara; Hideo Hosono

doi:10.1021/acs.jpcc.7b07268

Anchoring Bond between Ru and N Atoms of Ru/Ca₂NH Catalyst: Crucial for the High Ammonia Synthesis Activity

Hitoshi Abe, Yasuhiro Niwa, Masaaki Kitano, Yasunori Inoue, Masato Sasase, Takuya Nakao, Tomofumi Tada, Toshiharu Yokoyama, Michikazu Hara, Hideo Hosono

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

36 Citations (Scopus)

Abstract

Key functions for the stability and activity of Ru catalysts for ammonia synthesis were examined by X-ray absorption fine structure (XAFS) experiments. Ru K-edge XAFS measurements were carried out for two Ru catalysts, Ru/Ca₂NH and Ru/CaNH, which include N atoms in the supports. The stable Ru-N bond was observed in the Ru/Ca₂NH catalyst, but not in the Ru/CaNH catalyst, which was also supported by theoretical calculations in terms of Ru-anion bond strength. The bond observed in the Ru/Ca₂NH works to anchor the Ru nanoparticles to the Ca₂NH support, and the activity has been maintained. Formation of anchoring bonds between catalyst particles and supports is essential to create highly active and long lasting catalysts.

Original language	English
Pages (from-to)	20900-20904
Number of pages	5
Journal	Journal of Physical Chemistry C
Volume	121
Issue number	38
DOIs	https://doi.org/10.1021/acs.jpcc.7b07268
Publication status	Published - Sept 28 2017
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Energy(all)
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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10.1021/acs.jpcc.7b07268

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title = "Anchoring Bond between Ru and N Atoms of Ru/Ca2NH Catalyst: Crucial for the High Ammonia Synthesis Activity",

abstract = "Key functions for the stability and activity of Ru catalysts for ammonia synthesis were examined by X-ray absorption fine structure (XAFS) experiments. Ru K-edge XAFS measurements were carried out for two Ru catalysts, Ru/Ca2NH and Ru/CaNH, which include N atoms in the supports. The stable Ru-N bond was observed in the Ru/Ca2NH catalyst, but not in the Ru/CaNH catalyst, which was also supported by theoretical calculations in terms of Ru-anion bond strength. The bond observed in the Ru/Ca2NH works to anchor the Ru nanoparticles to the Ca2NH support, and the activity has been maintained. Formation of anchoring bonds between catalyst particles and supports is essential to create highly active and long lasting catalysts.",

author = "Hitoshi Abe and Yasuhiro Niwa and Masaaki Kitano and Yasunori Inoue and Masato Sasase and Takuya Nakao and Tomofumi Tada and Toshiharu Yokoyama and Michikazu Hara and Hideo Hosono",

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doi = "10.1021/acs.jpcc.7b07268",

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T1 - Anchoring Bond between Ru and N Atoms of Ru/Ca2NH Catalyst

T2 - Crucial for the High Ammonia Synthesis Activity

AU - Abe, Hitoshi

AU - Niwa, Yasuhiro

AU - Kitano, Masaaki

AU - Inoue, Yasunori

AU - Sasase, Masato

AU - Nakao, Takuya

AU - Tada, Tomofumi

AU - Yokoyama, Toshiharu

AU - Hara, Michikazu

AU - Hosono, Hideo

PY - 2017/9/28

Y1 - 2017/9/28

N2 - Key functions for the stability and activity of Ru catalysts for ammonia synthesis were examined by X-ray absorption fine structure (XAFS) experiments. Ru K-edge XAFS measurements were carried out for two Ru catalysts, Ru/Ca2NH and Ru/CaNH, which include N atoms in the supports. The stable Ru-N bond was observed in the Ru/Ca2NH catalyst, but not in the Ru/CaNH catalyst, which was also supported by theoretical calculations in terms of Ru-anion bond strength. The bond observed in the Ru/Ca2NH works to anchor the Ru nanoparticles to the Ca2NH support, and the activity has been maintained. Formation of anchoring bonds between catalyst particles and supports is essential to create highly active and long lasting catalysts.

AB - Key functions for the stability and activity of Ru catalysts for ammonia synthesis were examined by X-ray absorption fine structure (XAFS) experiments. Ru K-edge XAFS measurements were carried out for two Ru catalysts, Ru/Ca2NH and Ru/CaNH, which include N atoms in the supports. The stable Ru-N bond was observed in the Ru/Ca2NH catalyst, but not in the Ru/CaNH catalyst, which was also supported by theoretical calculations in terms of Ru-anion bond strength. The bond observed in the Ru/Ca2NH works to anchor the Ru nanoparticles to the Ca2NH support, and the activity has been maintained. Formation of anchoring bonds between catalyst particles and supports is essential to create highly active and long lasting catalysts.

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Anchoring Bond between Ru and N Atoms of Ru/Ca₂NH Catalyst: Crucial for the High Ammonia Synthesis Activity

Abstract

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