skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: In Situ X-ray Absorption Fine Structure Studies on the Effect of pH on Pt Electronic Density during Aqueous Phase Reforming of Glycerol

Abstract

In situ x-ray absorption spectroscopy (XAS) results on correlating the Pt local coordination and electronic structure with the Pt/C catalyst activity and selectivity during aqueous reforming of glycerol at different pH are reported. The results show that both low and high pH favor C-O cleavage over that of C-C. However, the selectivity towards C-O bond cleavage was higher under the acidic conditions. XANES measurements under reaction conditions showed that low pH increased the Pt electron density while the effect of basic conditions was minimal. ΔXANES was used to estimate the coverage of adsorbates under reaction conditions and the results suggest a change in the adsorbates coverage by the acidic conditions, resulting in higher electron density on Pt

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1054441
Report Number(s):
PNNL-SA-89904
46195; BM0101010
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
ACS Catalysis, 2(11):2387-2394
Additional Journal Information:
Journal Name: ACS Catalysis, 2(11):2387-2394
Country of Publication:
United States
Language:
English
Subject:
In situ EXAFS; XANES; Pt/C; pH; aqueous phase reforming; adsorbates; electronic density; Environmental Molecular Sciences Laboratory

Citation Formats

Karim, Ayman M., Howard, Christopher J., Roberts, Benjamin Q., Kovarik, Libor, Zhang, Liang, King, David L., and Wang, Yong. In Situ X-ray Absorption Fine Structure Studies on the Effect of pH on Pt Electronic Density during Aqueous Phase Reforming of Glycerol. United States: N. p., 2012. Web. doi:10.1021/cs3005049.
Karim, Ayman M., Howard, Christopher J., Roberts, Benjamin Q., Kovarik, Libor, Zhang, Liang, King, David L., & Wang, Yong. In Situ X-ray Absorption Fine Structure Studies on the Effect of pH on Pt Electronic Density during Aqueous Phase Reforming of Glycerol. United States. doi:10.1021/cs3005049.
Karim, Ayman M., Howard, Christopher J., Roberts, Benjamin Q., Kovarik, Libor, Zhang, Liang, King, David L., and Wang, Yong. Tue . "In Situ X-ray Absorption Fine Structure Studies on the Effect of pH on Pt Electronic Density during Aqueous Phase Reforming of Glycerol". United States. doi:10.1021/cs3005049.
@article{osti_1054441,
title = {In Situ X-ray Absorption Fine Structure Studies on the Effect of pH on Pt Electronic Density during Aqueous Phase Reforming of Glycerol},
author = {Karim, Ayman M. and Howard, Christopher J. and Roberts, Benjamin Q. and Kovarik, Libor and Zhang, Liang and King, David L. and Wang, Yong},
abstractNote = {In situ x-ray absorption spectroscopy (XAS) results on correlating the Pt local coordination and electronic structure with the Pt/C catalyst activity and selectivity during aqueous reforming of glycerol at different pH are reported. The results show that both low and high pH favor C-O cleavage over that of C-C. However, the selectivity towards C-O bond cleavage was higher under the acidic conditions. XANES measurements under reaction conditions showed that low pH increased the Pt electron density while the effect of basic conditions was minimal. ΔXANES was used to estimate the coverage of adsorbates under reaction conditions and the results suggest a change in the adsorbates coverage by the acidic conditions, resulting in higher electron density on Pt},
doi = {10.1021/cs3005049},
journal = {ACS Catalysis, 2(11):2387-2394},
number = ,
volume = ,
place = {United States},
year = {2012},
month = {10}
}