New information related to the adsorption model of N2 on CuMFI at room temperature

Atsushi Itadani; Hiroyuki Sugiyama; Masashi Tanaka; Toshinori Mori; Mahiko Nagao; Yasushige Kuroda

doi:10.1021/jp076944t

New information related to the adsorption model of N₂ on CuMFI at room temperature

Atsushi Itadani, Hiroyuki Sugiyama, Masashi Tanaka, Toshinori Mori, Mahiko Nagao, Yasushige Kuroda

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

18 Citations (Scopus)

Abstract

The N₂ adsorption occurring at temperatures around room temperature is a particularly surprising phenomenon given by the copper ion-exchanged MFI-type zeolite (CuMFI). However, the assignment of the active sites for N₂ adsorption on CuMFI at room temperature is controversial: which ones act as the real active center, the dimeric or monomeric Cu⁺ sites? We have analyzed the real active site for N ₂ adsorption by studying the adsorption of CO and N₂, and also by spectroscopic methods, such as photoluminescence, X-ray absorption fine structure, and IR measurements. Clear evidence was observed for the adsorption of N₂ molecules on the monomeric Cu⁺ ions exchanged in the MFI-type zeolite at temperatures around room temperature, which puts to an end the dispute regarding the dimeric state made up of the monovalent copper ions as being a potential adsorption site.

Original language	English
Pages (from-to)	16701-16705
Number of pages	5
Journal	Journal of Physical Chemistry C
Volume	111
Issue number	45
DOIs	https://doi.org/10.1021/jp076944t
Publication status	Published - Nov 15 2007

ASJC Scopus subject areas

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

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abstract = "The N2 adsorption occurring at temperatures around room temperature is a particularly surprising phenomenon given by the copper ion-exchanged MFI-type zeolite (CuMFI). However, the assignment of the active sites for N2 adsorption on CuMFI at room temperature is controversial: which ones act as the real active center, the dimeric or monomeric Cu+ sites? We have analyzed the real active site for N 2 adsorption by studying the adsorption of CO and N2, and also by spectroscopic methods, such as photoluminescence, X-ray absorption fine structure, and IR measurements. Clear evidence was observed for the adsorption of N2 molecules on the monomeric Cu+ ions exchanged in the MFI-type zeolite at temperatures around room temperature, which puts to an end the dispute regarding the dimeric state made up of the monovalent copper ions as being a potential adsorption site.",

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AU - Itadani, Atsushi

AU - Sugiyama, Hiroyuki

AU - Tanaka, Masashi

AU - Mori, Toshinori

AU - Nagao, Mahiko

AU - Kuroda, Yasushige

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N2 - The N2 adsorption occurring at temperatures around room temperature is a particularly surprising phenomenon given by the copper ion-exchanged MFI-type zeolite (CuMFI). However, the assignment of the active sites for N2 adsorption on CuMFI at room temperature is controversial: which ones act as the real active center, the dimeric or monomeric Cu+ sites? We have analyzed the real active site for N 2 adsorption by studying the adsorption of CO and N2, and also by spectroscopic methods, such as photoluminescence, X-ray absorption fine structure, and IR measurements. Clear evidence was observed for the adsorption of N2 molecules on the monomeric Cu+ ions exchanged in the MFI-type zeolite at temperatures around room temperature, which puts to an end the dispute regarding the dimeric state made up of the monovalent copper ions as being a potential adsorption site.

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