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Influence of residual chlorine on Ru/TiO2 active sites during CO2 methanation

Journal Article · · Applied Catalysis. A, General
Titania-supported ruthenium (Ru/TiO2) is an established catalyst for the hydrogenation of carbon dioxide to methane (Sabatier reaction). Chlorine contamination, owed to the RuCl3 precursor, is demonstrated to have a detrimental impact on methanation activity. After calcination and reduction the catalyst contains residual chlorine, shown by XPS. An aqueous ammonia wash removes Cl without leaching Ru. The washed catalysts exhibit improvements in CH4 site-time yields. Low Ru loading catalysts encounter the greatest activity enhancements after washing (~4.5-fold). DFT calculations indicate that chlorine and CO2 directly compete for adsorption on Ru step sites, with Cl impeding the adsorption of CO2 at under-coordinated sites and at higher Cl coverages. H2-chemisorption/TPR show that Cl removal lowers the onset of low temperature H2 dissociation on Ru. Finally, DRIFTS provide evidence that the removal of Cl facilitates low temperature dissociative binding of CO2, indicated by the formation of surface bound linear CO species.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE; USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
AC36-08GO28308; AC52-07NA27344
OSTI ID:
1990040
Alternate ID(s):
OSTI ID: 1999875
Report Number(s):
NREL/JA-5100-85305; MainId:86078; UUID:7e6355c3-554a-42b4-bde7-b15221912245; MainAdminID:69968
Journal Information:
Applied Catalysis. A, General, Journal Name: Applied Catalysis. A, General Vol. 663; ISSN 0926-860X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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  • Panagiotopoulou, Paraskevi; Kondarides, Dimitris I.; Verykios, Xenophon E.
  • The Journal of Physical Chemistry C, Vol. 115, Issue 4 https://doi.org/10.1021/jp106538z
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