Improved CO oxidation activity in the presence and absence of hydrogen over cluster-derived PtFe/SiO 2 catalysts. Siani, A., Captain, B., Alexeev, S, O., Stafyla, E., Hungria, B, A., Midgley, A, P., Thomas, M, J., Adams, D, R., Amiridis, & D, M. Langmuir, 22(11):5160--5167, Department of Chemical Engineering, University of South Carolina, Columbia, SC 29208, United States, 2006.
Improved CO oxidation activity in the presence and absence of hydrogen over cluster-derived PtFe/SiO 2 catalysts [link]Paper  abstract   bibtex   
The catalytic performance of cluster-derived PtFe/SiO 2 bimetallic catalysts for the oxidation of CO has been examined in the absence and presence of H2 (PROX) and compared to that of Pt/SiO 2- PtFe 2/SiO 2 and Pt;Fe 2/SiO 2 samples were prepared from PtFe 2(COD)(CO) 8 and Pt 5Fe 2(COD) 2(CO) 12 organometallic cluster precursors, respectively. FTIR data indicate that both clusters can be deposited intact on the SiO 2 support. The clusters remained weakly bonded to the SiO 2 surface and could be extracted with CH 2Cl 2 without any significant changes in their structure. Subsequent heating in H 2 led to complete decarbonylation of the supported clusters at approximately 350°C and the formation of Pt-Fe nanoparticles with sizes in the 1-2 nm range, as indicated by HRTEM imaging. A few larger nanoparticles enriched in Pt were also observed, indicating that a small fraction of the deposited clusters were segregated to the individual components following the hydrogen treatment. A higher degree of metal dispersion and more homogeneous mixing of the two metals were observed during HRTEM/XEDS analysis with the cluster-derived samples, as compared to a PtFe/SiO 2 catalyst prepared through a conventional impregnation route. Furthermore, the cluster-derived PtFe 2/SiO 2 and Pt 5Fe 2/SiO 2 samples were more active than Pt/SiO 2 and the conventionally prepared PtFe/SiO 2 sample for the oxidation of CO in air. However, substantial deactivation was also observed, indicating that the properties of the Pt-Fe bimetallic sites in the cluster-derived samples were altered by exposure to the reactants. The Pt 5Fe 2/SiO 2 sample was also more active than Pt/SiO 2 for PROX with a selectivity of approximately 92% at 50°C. In this case, the deactivation with time on stream was substantially slower, indicating that the highly reducing environment under the PROX conditions helps maintain the properties of the active Pt-Fe bimetallic sites. © 2006 American Chemical Society.
@article{ Siani2006a,
  abstract = {The catalytic performance of cluster-derived PtFe/SiO 2 bimetallic catalysts for the oxidation of CO has been examined in the absence and presence of H2 (PROX) and compared to that of Pt/SiO 2- PtFe 2/SiO 2 and Pt;Fe 2/SiO 2 samples were prepared from PtFe 2(COD)(CO) 8 and Pt 5Fe 2(COD) 2(CO) 12 organometallic cluster precursors, respectively. FTIR data indicate that both clusters can be deposited intact on the SiO 2 support. The clusters remained weakly bonded to the SiO 2 surface and could be extracted with CH 2Cl 2 without any significant changes in their structure. Subsequent heating in H 2 led to complete decarbonylation of the supported clusters at approximately 350°C and the formation of Pt-Fe nanoparticles with sizes in the 1-2 nm range, as indicated by HRTEM imaging. A few larger nanoparticles enriched in Pt were also observed, indicating that a small fraction of the deposited clusters were segregated to the individual components following the hydrogen treatment. A higher degree of metal dispersion and more homogeneous mixing of the two metals were observed during HRTEM/XEDS analysis with the cluster-derived samples, as compared to a PtFe/SiO 2 catalyst prepared through a conventional impregnation route. Furthermore, the cluster-derived PtFe 2/SiO 2 and Pt 5Fe 2/SiO 2 samples were more active than Pt/SiO 2 and the conventionally prepared PtFe/SiO 2 sample for the oxidation of CO in air. However, substantial deactivation was also observed, indicating that the properties of the Pt-Fe bimetallic sites in the cluster-derived samples were altered by exposure to the reactants. The Pt 5Fe 2/SiO 2 sample was also more active than Pt/SiO 2 for PROX with a selectivity of approximately 92% at 50°C. In this case, the deactivation with time on stream was substantially slower, indicating that the highly reducing environment under the PROX conditions helps maintain the properties of the active Pt-Fe bimetallic sites. © 2006 American Chemical Society.},
  address = {Department of Chemical Engineering, University of South Carolina, Columbia, SC 29208, United States},
  annote = {Cited By (since 1996): 39

Export Date: 15 January 2013

Source: Scopus

CODEN: LANGD

doi: 10.1021/la053476a

Language of Original Document: English

Correspondence Address: Amiridis, M.D.; Department of Chemical Engineering, University of South Carolina, Columbia, SC 29208, United States

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  author = {Siani, A and Captain, B and Alexeev, O S and Stafyla, E and Hungria, A B and Midgley, P A and Thomas, J M and Adams, R D and Amiridis, M D},
  issn = {07437463 (ISSN) },
  journal = {Langmuir},
  keywords = {Bimetals,Carbon inorganic compounds,Carbon monoxide,Conventional impregnation route,Decarbonylation,Fourier transform infrared spectroscopy,Hydrogen,Metal dispersion,Organometallic cluster precursors,Organometallics,Oxidation,Platinum compounds,Segregation (metallography),Silica},
  number = {11},
  pages = {5160--5167},
  title = {{Improved CO oxidation activity in the presence and absence of hydrogen over cluster-derived PtFe/SiO                      2 catalysts}},
  url = {https://www.scopus.com/inward/record.url?eid=2-s2.0-33745759894\&partnerID=40\&md5=377ca96b1d1603c70f0442ded70322dd},
  volume = {22},
  year = {2006}
}

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