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Probing the existing state of Cu(II) in a Cu–Al spinel catalyst using N2O decomposition reaction with the aid of conventional characterizations

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Abstract

Cu–Al spinel solid solution as a sustained release catalyst has been efficiently applied in methanol steam reforming. The non-spinel CuO species in this catalyst plays a crucial role in initiating the reaction. This paper systematically studies the existing state of the copper species using N2O decomposition reaction in combination with other characterization techniques. The non-spinel CuO is composed of free CuO and interacting Cu(II) forming Cu–O–Al bonds. The catalytic activity is related to the existing state of Cu(II), which determines the generation of Cu+ active centers. It has been verified that highly dispersed free CuO facilitates the in situ generation of the Cu+ active centers. Hence, free CuO shows the ability to catalyze the decomposition reaction, while the interacting Cu(II) and spinel type Cu(II) reveal little activity. The activity of CuAl-950 is enhanced dramatically when the interacting Cu(II) is converted to free Cu(II) by reduction–oxidation treatment. Therefore, we suggest that N2O decomposition may be used as a reliable method to probe the existing state of Cu(II).

Graphical abstract: Probing the existing state of Cu(ii) in a Cu–Al spinel catalyst using N2O decomposition reaction with the aid of conventional characterizations

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Publication details

The article was received on 22 Mar 2019, accepted on 04 May 2019 and first published on 09 May 2019


Article type: Paper
DOI: 10.1039/C9CY00563C
Catal. Sci. Technol., 2019, Advance Article

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    Probing the existing state of Cu(II) in a Cu–Al spinel catalyst using N2O decomposition reaction with the aid of conventional characterizations

    X. Hou, F. Qin, S. Qing, Y. Liu, L. Li, Z. Gao and Y. Qin, Catal. Sci. Technol., 2019, Advance Article , DOI: 10.1039/C9CY00563C

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