Further evidence for the existence of a dual-Cu+ site in MFI working as the efficient site for C2H6 adsorption at room temperature

Atsushi Itadani; Yusuke Sogawa; Akira Oda; Hiroe Torigoe; Takahiro Ohkubo; Yasushige Kuroda

doi:10.1021/la4018568

Further evidence for the existence of a dual-Cu⁺ site in MFI working as the efficient site for C₂H₆ adsorption at room temperature

Atsushi Itadani, Yusuke Sogawa, Akira Oda, Hiroe Torigoe, Takahiro Ohkubo, Yasushige Kuroda

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

8 Citations (Scopus)

Abstract

We have recently clarified the following point: a dual-type site, which is composed of a pair of monovalent copper ions (Cu⁺) formed in a copper-ion-exchanged MFI-type zeolite (CuMFI), functions as the active center for strong ethane (C₂H₆) adsorption even at room temperature rather than a single-type site composed of a Cu⁺ ion. However, the character of the dual-Cu⁺ site in a CuMFI is not yet fully understood. In this study, we have elucidated the nature of the active sites for C₂H₆ based on infrared (IR) and calorimetric data. On the basis of the results obtained, we came to the conclusion that the dual-Cu⁺ site composed of Cu⁺ ions giving the adsorption energy of 100 kJ mol^-1 and the absorption band at 2151 cm ^-1 for carbon monoxide (used as a probe molecule) at room temperature functions as an adsorption site for C₂H₆. We also evaluated, for the first time, the interaction between the dual-Cu⁺ site and C₂H₆ energetically, by the direct measurement of heat of adsorption. The value of 67 kJ mol^-1 that we recorded was higher than that for the single-Cu⁺ site in this sample and also for other samples, such as NaMFI and HMFI.

Original language	English
Pages (from-to)	9727-9733
Number of pages	7
Journal	Langmuir
Volume	29
Issue number	31
DOIs	https://doi.org/10.1021/la4018568
Publication status	Published - Aug 6 2013

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Surfaces and Interfaces
Spectroscopy
Electrochemistry

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abstract = "We have recently clarified the following point: a dual-type site, which is composed of a pair of monovalent copper ions (Cu+) formed in a copper-ion-exchanged MFI-type zeolite (CuMFI), functions as the active center for strong ethane (C2H6) adsorption even at room temperature rather than a single-type site composed of a Cu+ ion. However, the character of the dual-Cu+ site in a CuMFI is not yet fully understood. In this study, we have elucidated the nature of the active sites for C2H6 based on infrared (IR) and calorimetric data. On the basis of the results obtained, we came to the conclusion that the dual-Cu+ site composed of Cu+ ions giving the adsorption energy of 100 kJ mol-1 and the absorption band at 2151 cm -1 for carbon monoxide (used as a probe molecule) at room temperature functions as an adsorption site for C2H6. We also evaluated, for the first time, the interaction between the dual-Cu+ site and C2H6 energetically, by the direct measurement of heat of adsorption. The value of 67 kJ mol-1 that we recorded was higher than that for the single-Cu+ site in this sample and also for other samples, such as NaMFI and HMFI.",

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AU - Torigoe, Hiroe

AU - Ohkubo, Takahiro

AU - Kuroda, Yasushige

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Further evidence for the existence of a dual-Cu⁺ site in MFI working as the efficient site for C₂H₆ adsorption at room temperature

Abstract

ASJC Scopus subject areas

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