Issue 18, 2019

Ceria–zirconia encapsulated Ni nanoparticles for CO2 methanation

Abstract

We prepared uniformly-sized Ni nanoparticles on ceria–zirconia (CZ) as model catalysts for CO2 methanation in the context of renewable energy storage. CZ was synthesized via a sol–gel method with Ni being introduced either via incipient-wetness impregnation on calcined CZ or as a colloidal Ni nanoparticle (NiNP) dispersion during sol–gel synthesis. Catalysts were characterized with XRD, N2 physisorption, H2-TPR, H2 chemisorption, XPS and HAADF-STEM with EDX mapping. The Ni/CZ (IWI) catalyst contained large Ni particles after reduction, whereas co-gelation led to NiNP encapsulated in CZ, the particles retaining their initial size of 4.5 nm obtained by the earlier colloidal synthesis. Encapsulated Ni@CZ exhibited superior catalytic activity and stability for CO2 methanation over Ni/CZ. A comparison of Ni@CZ with (encapsulated) Ni@SiO2 prepared from the same colloidal NiNP dispersion showed that CZ shows a strong synergy with Ni in CO2 methanation and results in an order of magnitude higher activity compared to SiO2.

Graphical abstract: Ceria–zirconia encapsulated Ni nanoparticles for CO2 methanation

Supplementary files

Article information

Article type
Paper
Submitted
18 Jul 2019
Accepted
11 Aug 2019
First published
12 Aug 2019
This article is Open Access
Creative Commons BY-NC license

Catal. Sci. Technol., 2019,9, 5001-5010

Ceria–zirconia encapsulated Ni nanoparticles for CO2 methanation

W. L. Vrijburg, J. W. A. van Helden, A. Parastaev, E. Groeneveld, E. A. Pidko and E. J. M. Hensen, Catal. Sci. Technol., 2019, 9, 5001 DOI: 10.1039/C9CY01428D

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