Favored hydrogenation of linear carbon monoxide over cobalt loaded on fibrous silica KCC-1

N. A.A. Fatah, A. A. Jalil*, S. Triwahyono, N. Yusof, C. R. Mamat, S. M. Izan, M. Y.S. Hamid, I. Hussain, R. H. Adnan, T. A.T. Abdullah, W. Nabgan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

In this study, the conversion of CO into CH4 was investigated utilizing a series of cobalt loaded on fibrous silica (KCC-1) catalysts (Co loading of 5–30 wt%), that were synthesized via microemulsion and impregnation techniques. FESEM-EDX and N2 physisorption demonstrated that the KCC-1 possessed a spherical structure with fibrous silica dendrimeric morphology with a superior surface area of 861 m2g-1. A significant decreased in the catalyst surface area was noticed upon the addition of Co, suggesting a possible occurrence of KCC-1 pore blockage. Inversely, the number of basic sites on KCC-1 was enhanced after the incorporation of Co, as observed by pyrrole adsorbed FTIR. At 523 K, bare KCC-1 exhibited a very low activity for CO methanation due to low basicity and the absence of surface active sites. The 20Co/KCC-1 demonstrated the best catalytic performance with 72.7% yield of CH4 and 6.8% of CO2. These results were plausibly attributed to the high intrinsic number of basic sites and high dispersion of Co on KCC-1 support. A detailed in-situ FTIR spectroscopy study revealed that both types of associative and dissociative mechanism pathways significantly contributed to the high catalytic methanation activity. In addition to the dissociative mechanism, the linear CO species adsorbed on the Co metal by associative mechanism was also further hydrogenated to obtain the final CH4 products.

Original languageEnglish
Pages (from-to)9522-9534
Number of pages13
JournalInternational Journal of Hydrogen Energy
Volume45
Issue number16
DOIs
StatePublished - 20 Mar 2020
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2020 Hydrogen Energy Publications LLC

Keywords

  • CO methanation
  • Cobalt loading
  • Fibrous silica KCC-1
  • Intrinsic basic site

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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