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Nickel based mesoporous silica-ceria-zirconia composite for carbon dioxide reforming of methane

Paper ID Volume ID Publish Year Pages File Format Full-Text
38928 45797 2016 11 PDF Available
Title
Nickel based mesoporous silica-ceria-zirconia composite for carbon dioxide reforming of methane
Abstract

•The Si-MCeZr composite is prepared via EISA strategy.•The silica improves the thermal stability of MCeZr.•The Ni/Si-MCeZr exhibits high catalytic activity and stability for CO2 reforming of CH4.•The enhanced performance originates from the high surface concentration of oxygen vacancy induced by silica incorporation.

A series of mesoporous silica-ceria-zirconia composite (Si-MCeZr) with variable Si/(Ce + Zr) molar ratios are prepared by improved evaporation induced self-assemble strategy (EISA). TEM and XRD measurements show that the Si-MCeZr frameworks are made of ceria-zirconia solid solutions crystalline nanoparticles and the amorphous silica that serves as glue connecting the nanocrystals. The further heating treatment (700 °C) reveals that the thermal stability of Si-MCeZr is higher than that of Si free mesoporous ceria-zirconia solid solution (MCeZr). This might be due to the key role of the introduction of Si, which improves the thermal stability via inhibiting the growth of nanoparticles and crystallization of ceria-zirconia solid solution nanoparticles. Furthermore, the Si-MCeZr materials are applied as support to prepare nickel based catalysts (Ni/Si-MCeZr) for CO2 reforming of CH4. The XPS analyses show that the concentration of surface oxygen vacancies in Ni/Si-MCeZr increases with the increasing of Si/(Ce + Zr) molar ratios. The long term reforming test demonstrates that the catalytic stability of Ni/Si-MCeZr is improved compared to Si free nickel based catalyst (Ni/MCeZr). The obtained results indicate that enhanced durability may originate from the higher concentration of oxygen vacancies, more rapid oxygen mobility and improved nickel dispersion in Ni/Si-MCeZr, which contribute largely to higher catalytic activity and decoking ability in reforming reaction, as confirmed by TG-DSC and XRD characterizations of catalysts before and after stability tests.

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Keywords
Mesoporous; Silica-ceria-zirconium composite; Oxygen vacancy; CO2 reforming; Stability
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 520, 25 June 2016, Pages 140–150
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us