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

Title: Fischer–Tropsch Synthesis: XANES Spectra of Potassium in Promoted Precipitated Iron Catalysts as a Function of Time On-stream

Abstract

XANES K-edge spectra of potassium promoter in precipitated Fe catalysts were acquired following activation by carburization in CO and as a function of time on-stream during the course of a Fischer–Tropsch synthesis run for a 100Fe:2K catalyst by withdrawing catalysts, sealed in wax product, for analysis. CO-activated and end-of-run spectra of the catalyst were also obtained for a 100Fe:5K catalyst. Peaks representing electronic transitions and multiple scattering were observed and resembled reference spectra for potassium carbonate or potassium formate. The shift in the multiple scattering peak to higher energy was consistent with sintering of potassium promoter during the course of the reaction test. The catalyst, however, retained its carbidic state, as demonstrated by XANES and EXAFS spectra at the iron K-edge, suggesting that sintering of potassium did not adversely affect the carburization rate, which is important for preventing iron carbides from oxidizing. This method serves as a starting point for developing better understanding of the chemical state and changes in structure occurring with alkali promoter.

Authors:
 [1];  [2];  [2];  [2];  [2];  [3];  [4];  [4];  [2]
  1. Univ. of Kentucky, Lexington, KY (United States). Center for Applied Energy Research; Univ. of Texas, San Antonio, TX (United States). Dept. of Biomedical and Chemical Engineering
  2. Univ. of Kentucky, Lexington, KY (United States). Center for Applied Energy Research
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
  4. Canadian Light Sources, Inc., Saskatoon, SK (Canada)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Commonwealth of Kentucky; Canadian Light Sources, Inc., Saskatoon, SK (Canada)
OSTI Identifier:
1433948
Report Number(s):
BNL-203462-2018-JAAM
Journal ID: ISSN 1011-372X
Grant/Contract Number:  
SC0012704; AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Catalysis Letters
Additional Journal Information:
Journal Volume: 147; Journal Issue: 8; Journal ID: ISSN 1011-372X
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 43 PARTICLE ACCELERATORS; Fischer-Tropsch synthesis; iron-based catalyst; potassium promoter; olefin selectivity; XANES/EXAFS

Citation Formats

Jacobs, Gary, Pendyala, Venkat Ramana Rao, Martinelli, Michela, Shafer, Wilson D., Gnanamani, Muthu Kumaran, Khalid, Syed, MacLennan, Aimee, Hu, Yongfeng, and Davis, Burtron H. Fischer–Tropsch Synthesis: XANES Spectra of Potassium in Promoted Precipitated Iron Catalysts as a Function of Time On-stream. United States: N. p., 2017. Web. doi:10.1007/s10562-017-2090-9.
Jacobs, Gary, Pendyala, Venkat Ramana Rao, Martinelli, Michela, Shafer, Wilson D., Gnanamani, Muthu Kumaran, Khalid, Syed, MacLennan, Aimee, Hu, Yongfeng, & Davis, Burtron H. Fischer–Tropsch Synthesis: XANES Spectra of Potassium in Promoted Precipitated Iron Catalysts as a Function of Time On-stream. United States. doi:10.1007/s10562-017-2090-9.
Jacobs, Gary, Pendyala, Venkat Ramana Rao, Martinelli, Michela, Shafer, Wilson D., Gnanamani, Muthu Kumaran, Khalid, Syed, MacLennan, Aimee, Hu, Yongfeng, and Davis, Burtron H. Tue . "Fischer–Tropsch Synthesis: XANES Spectra of Potassium in Promoted Precipitated Iron Catalysts as a Function of Time On-stream". United States. doi:10.1007/s10562-017-2090-9. https://www.osti.gov/servlets/purl/1433948.
@article{osti_1433948,
title = {Fischer–Tropsch Synthesis: XANES Spectra of Potassium in Promoted Precipitated Iron Catalysts as a Function of Time On-stream},
author = {Jacobs, Gary and Pendyala, Venkat Ramana Rao and Martinelli, Michela and Shafer, Wilson D. and Gnanamani, Muthu Kumaran and Khalid, Syed and MacLennan, Aimee and Hu, Yongfeng and Davis, Burtron H.},
abstractNote = {XANES K-edge spectra of potassium promoter in precipitated Fe catalysts were acquired following activation by carburization in CO and as a function of time on-stream during the course of a Fischer–Tropsch synthesis run for a 100Fe:2K catalyst by withdrawing catalysts, sealed in wax product, for analysis. CO-activated and end-of-run spectra of the catalyst were also obtained for a 100Fe:5K catalyst. Peaks representing electronic transitions and multiple scattering were observed and resembled reference spectra for potassium carbonate or potassium formate. The shift in the multiple scattering peak to higher energy was consistent with sintering of potassium promoter during the course of the reaction test. The catalyst, however, retained its carbidic state, as demonstrated by XANES and EXAFS spectra at the iron K-edge, suggesting that sintering of potassium did not adversely affect the carburization rate, which is important for preventing iron carbides from oxidizing. This method serves as a starting point for developing better understanding of the chemical state and changes in structure occurring with alkali promoter.},
doi = {10.1007/s10562-017-2090-9},
journal = {Catalysis Letters},
number = 8,
volume = 147,
place = {United States},
year = {2017},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 1 work
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

Effects of potassium promotion on the activity and selectivity of iron Fischer-Tropsch catalysts
journal, January 1983

  • Arakawa, Hironori; Bell, Alexis T.
  • Industrial & Engineering Chemistry Process Design and Development, Vol. 22, Issue 1
  • DOI: 10.1021/i200020a017

The effects of carbon, oxygen, sulfur and potassium adlayers on CO and H2 adsorption on Fe(100)
journal, April 1980


Promoter effects on precipitated iron catalysts for Fischer-Tropsch synthesis
journal, February 1990

  • Bukur, Dragomir B.; Mukesh, Doble; Patel, Snehal A.
  • Industrial & Engineering Chemistry Research, Vol. 29, Issue 2
  • DOI: 10.1021/ie00098a008

K-Edge X-Ray Absorption Spectra from Potassium Compounds
journal, December 1985


Fischer–Tropsch synthesis: A review of the effect of CO conversion on methane selectivity
journal, January 2014


Fischer–Tropsch Synthesis: Deactivation as a Function of Potassium Promoter Loading for Precipitated Iron Catalyst
journal, August 2014

  • Pendyala, Venkat Ramana Rao; Graham, Uschi M.; Jacobs, Gary
  • Catalysis Letters, Vol. 144, Issue 10
  • DOI: 10.1007/s10562-014-1336-z

Analysis of multiple-scattering XAFS data using theoretical standards
journal, March 1995


Theoretical approaches to x-ray absorption fine structure
journal, July 2000


WinXAS a Program for X-ray Absorption Spectroscopy Data Analysis under MS-Windows
journal, March 1998


Fischer-Tropsch Synthesis: Morphology, Phase Transformation, and Carbon-Layer Growth of Iron-Based Catalysts
journal, June 2014

  • Pendyala, Venkat Ramana Rao; Graham, Uschi M.; Jacobs, Gary
  • ChemCatChem, Vol. 6, Issue 7
  • DOI: 10.1002/cctc.201402073

Supported Iron Fischer–Tropsch Catalyst: Superior Activity and Stability Using a Thermally Stable Silica-Doped Alumina Support
journal, March 2014

  • Keyvanloo, Kamyar; Mardkhe, Maryam Khosravi; Alam, Todd M.
  • ACS Catalysis, Vol. 4, Issue 4
  • DOI: 10.1021/cs401242d

ATOMS : crystallography for the X-ray absorption spectroscopist
journal, March 2001