TY - JOUR
T1 - Ceria-Zirconia encapsulated Ni nanoparticles for CO2 methanation
AU - Vrijburg, Wilbert
AU - van Helden, J.W.A.
AU - Parastaev, Alexander
AU - Groeneveld, Esther
AU - Pidko, Evgeny
AU - Hensen, Emiel
PY - 2019/8/12
Y1 - 2019/8/12
N2 - 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
AB - 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
UR - http://www.scopus.com/inward/record.url?scp=85072761191&partnerID=8YFLogxK
U2 - 10.1039/C9CY01428D
DO - 10.1039/C9CY01428D
M3 - Article
SN - 2044-4753
VL - 9
SP - 5001
EP - 5010
JO - Catalysis Science & Technology
JF - Catalysis Science & Technology
IS - 18
ER -