Engineering Metal-Oxide Interface by Depositing ZrO2 overcoating on Ni/Al2O3 for Dry Reforming of Methane

Author

Baitang Jin
Shiguang Li
Yuzi Liu
Xinhua Liang, Missouri University of Science and TechnologyFollow

Abstract

Zirconium oxide (ZrO₂) was deposited onto Ni/Al₂O₃ catalyst as overcoating by atomic layer deposition (ALD) for dry reforming of methane (DRM). High-temperature heating during H₂-reduction could transform the ALD-prepared ZrO₂ thin film to tetragonal phase and crack the encapsulating layer on Ni sites, which constructed a beneficial Ni-ZrO_x interface. Interfacial surface oxygen vacancies on ZrO₂ overcoating were induced by the partial reduction of ZrO₂ surface during high-temperature H₂ reduction, with the assistance of Ni. During DRM, the interfacial oxygen vacancies enhanced CO₂ activation by dissociating CO₂ and releasing active O, thereby limiting carbon formation. For DRM at 700 °C and 800 °C, Ni/Al₂O₃ with 5 cycles of ZrO₂ ALD overcoating enhanced both activity and stability significantly. For a 100-h DRM test at 600 °C, no deactivation was observed for the Ni/Al₂O₃ catalyst with 10 cycles of ZrO₂ ALD overcoating, as compared to 59% relative activity loss of Ni/Al₂O₃.

Recommended Citation

B. Jin et al., "Engineering Metal-Oxide Interface by Depositing ZrO2 overcoating on Ni/Al2O3 for Dry Reforming of Methane," Chemical Engineering Journal, vol. 436, article no. 135195, Elsevier, May 2022.

The definitive version is available at https://doi.org/10.1016/j.cej.2022.135195

Department(s)

Chemical and Biochemical Engineering

Comments

U.S. Department of Energy, Grant DE-FE0029760

Keywords and Phrases

Atomic layer deposition (ALD); Dry reforming of methane (DRM); Metal-oxide interface; Oxygen vacancy; ZrO overcoating 2

International Standard Serial Number (ISSN)

1385-8947

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2023 Elsevier, All rights reserved.

Publication Date

15 May 2022