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

Title: The Effect of Pitch Composition on the Adsorption Behavior of Pd-Doped ACF

Abstract

Recent studies indicate that metal-containing activated carbon fibers (ACF) are promising adsorbents for hydrogen storage applications. In these studies, Pd compounds were added to a petroleum precursor and formed into ACFs. Results showed that the molecular composition of the pitch had a significant affect on critical characteristics of the ACFs, such as pore size and Pd particle size. In an ongoing Department of Energy project, we are testing pitch precursors with carefully controlled chemical compositions in order to develop an optimum precursor for hydrogen storage applications. A low softening point pitch made by Marathon Oil is being separated into narrow molecular weight fractions using a dense gas extraction (DGE) process. In the current series of tests the heavier portion of the extracted pitch was used to prepare both undoped and Pd-doped carbon fibers. These fibers were activated over a range of temperatures to determine the effect of temperature and pitch composition on ACF properties. Lower activation temperatures resulted in increased microporosity (desirable for hydrogen adsorption) for all Pd-doped pitch precursors. Comparing ACFs produced from various DGE-extracted pitches showed that even small quantities of mesophase-forming components inhibited activation and significantly reduced microporosity. Additional DGE pitch fractions are now being tested tomore » further refine the optimum composition for hydrogen storage applications.« less

Authors:
 [1];  [1];  [2];  [2];  [2];  [1]
  1. Clemson University
  2. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Temperature Materials Lab. (HTML)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
932053
DOE Contract Number:
AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: CARBON 2007, Seattle, WA, USA, 20070715, 20070720
Country of Publication:
United States
Language:
English

Citation Formats

Tekinalp, Halil, Cervo, Eduardo, Thies, Mark C, Contescu, Cristian I, Gallego, Nidia C, and Edie, Dan. The Effect of Pitch Composition on the Adsorption Behavior of Pd-Doped ACF. United States: N. p., 2007. Web.
Tekinalp, Halil, Cervo, Eduardo, Thies, Mark C, Contescu, Cristian I, Gallego, Nidia C, & Edie, Dan. The Effect of Pitch Composition on the Adsorption Behavior of Pd-Doped ACF. United States.
Tekinalp, Halil, Cervo, Eduardo, Thies, Mark C, Contescu, Cristian I, Gallego, Nidia C, and Edie, Dan. Mon . "The Effect of Pitch Composition on the Adsorption Behavior of Pd-Doped ACF". United States. doi:.
@article{osti_932053,
title = {The Effect of Pitch Composition on the Adsorption Behavior of Pd-Doped ACF},
author = {Tekinalp, Halil and Cervo, Eduardo and Thies, Mark C and Contescu, Cristian I and Gallego, Nidia C and Edie, Dan},
abstractNote = {Recent studies indicate that metal-containing activated carbon fibers (ACF) are promising adsorbents for hydrogen storage applications. In these studies, Pd compounds were added to a petroleum precursor and formed into ACFs. Results showed that the molecular composition of the pitch had a significant affect on critical characteristics of the ACFs, such as pore size and Pd particle size. In an ongoing Department of Energy project, we are testing pitch precursors with carefully controlled chemical compositions in order to develop an optimum precursor for hydrogen storage applications. A low softening point pitch made by Marathon Oil is being separated into narrow molecular weight fractions using a dense gas extraction (DGE) process. In the current series of tests the heavier portion of the extracted pitch was used to prepare both undoped and Pd-doped carbon fibers. These fibers were activated over a range of temperatures to determine the effect of temperature and pitch composition on ACF properties. Lower activation temperatures resulted in increased microporosity (desirable for hydrogen adsorption) for all Pd-doped pitch precursors. Comparing ACFs produced from various DGE-extracted pitches showed that even small quantities of mesophase-forming components inhibited activation and significantly reduced microporosity. Additional DGE pitch fractions are now being tested to further refine the optimum composition for hydrogen storage applications.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: