Promoting effects of doping ZnO into coprecipitated Ni-Al2O3 catalyst on methane decomposition to hydrogen and carbon nanofibers

Chen, Jiuling, Qiao, Yuanhua and Li, Yongdan (2008) Promoting effects of doping ZnO into coprecipitated Ni-Al2O3 catalyst on methane decomposition to hydrogen and carbon nanofibers. Applied Catalysis A: General, 337 2: 148-154. doi:10.1016/j.apcata.2007.12.007


Author Chen, Jiuling
Qiao, Yuanhua
Li, Yongdan
Title Promoting effects of doping ZnO into coprecipitated Ni-Al2O3 catalyst on methane decomposition to hydrogen and carbon nanofibers
Formatted title
Promoting effects of doping ZnO into coprecipitated Ni-Al2O3 catalyst on methane decomposition to hydrogen and carbon nanofibers
Journal name Applied Catalysis A: General   Check publisher's open access policy
ISSN 0926-860X
1873-3875
Publication date 2008-03-25
Year available 2007
Sub-type Article (original research)
DOI 10.1016/j.apcata.2007.12.007
Volume 337
Issue 2
Start page 148
End page 154
Total pages 7
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Formatted abstract
ZnO was doped into coprecipitated Ni-Al2O3 catalyst to promote the activity and the stability in methane decomposition to hydrogen and carbon nanofibers. The promoting effects were examined with XRD, TPR, XPS and TEM, using an in situ thermal balance reactor and a tubular fixed-bed reactor. The results showed that there was a strong interaction between Ni-Al2O3 and the doped ZnO, which may result in the formation of ZnAl2O4 spinel-like structure. The doping of ZnO could improve both the activity and the stability of nickel particles in methane decomposition. Such promotion effects became more pronounced with the increase of ZnO content. The evolution of the morphologies of the carbon produced and of the catalyst particles with the reaction temperature suggested that the doping of ZnO may delay the appearance of the quasi-liquid state of the catalyst particles to the range of higher temperatures and may weaken the interfacial wetting effect between catalyst particles and the growing carbon layers to delay the encapsulation process of the catalyst particles.
Keyword Coprecipitated Ni-Al2O3 catalyst
Methane decomposition
Promoting effect
ZnO
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Available online 15 December 2007

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
 
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Created: Thu, 03 Sep 2009, 10:06:26 EST by Mr Andrew Martlew on behalf of School of Chemical Engineering