Journal
SOLID STATE SCIENCES
Volume 10, Issue 11, Pages 1499-1510Publisher
ELSEVIER
DOI: 10.1016/j.solidstatesciences.2008.03.018
Keywords
Metal carbides; Nanostructures; Pair-distribution function method; Neutron diffraction
Funding
- Department of Energy, (DOE) Office of Basic Energy Sciences (BES) [FG02-05ER15025]
- National Science Foundation
- NSF [DMR05-20415]
- National Institute of Standards and Technology, U.S. Department of Commerce
- Department of Energy, Office of Basic Energy Sciences
- National Science Foundation [DMR00-76488]
Ask authors/readers for more resources
As possible substitute materials for platinum group metal heterogeneous catalysts, high surface area carbides of the early transition metals Mo and W are of great interest. Here we report nanostructured, high surface area Mo2C and WC prepared by decomposing and carburizing ammonium paramolybdate [(NH4)(6)Mo7O24 center dot 4H(2)O] and ammonium paratungstate [(NH4)(10)W12O41 center dot 5H(2)O] in flowing 50%CH4/50%H-2. Surface areas as high as 52 m(2)/g for Mo2C and 24 m(2)/g for WC were obtained, with both structures crystallizing in structures appropriate for catalytic activity. We have studied these materials using a combination of neutron diffraction Rietveld refinement, X-ray photoelectron spectroscopy, surface area measurements, and scanning transmission electron microscopy. In addition, we have used pair-distribution function (PDF) analysis of the neutron total scattering data as a means of establishing the presence of graphitic carbon in the as-prepared materials. (c) 2008 Elsevier Masson SAS. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available