English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Experimental and Theoretical Investigation of Molybdenum Carbide and Nitride as Catalysts for Ammonia Decomposition

Zheng, W., Cotter, T. P., Kaghazchi, P., Jacob, T., Frank, B., Schlichte, K., et al. (2013). Experimental and Theoretical Investigation of Molybdenum Carbide and Nitride as Catalysts for Ammonia Decomposition. Journal of the American Chemical Society, 135(9), 3458-3464. doi:10.1021/ja309734u.

Item is

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Zheng, Weiqing1, Author
Cotter, Thomas Patric1, Author           
Kaghazchi, Payam1, Author           
Jacob, Timo2, Author           
Frank, Benjamin1, Author
Schlichte, Klaus3, Author           
Zhang, Wei1, Author
Su, Dang Sheng1, 4, Author           
Schüth, Ferdi3, Author           
Schloegl, Robert1, Author           
Affiliations:
1Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany , ou_persistent22              
2Universität Ulm, Albert-Einstein-Allee 47, 89081 Ulm (Germany), ou_persistent22              
3Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, D-45470 Mulheim, Germany , ou_1445589              
4Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China , ou_24023              

Content

show
hide
Free keywords: TRANSITION-METAL CARBIDES; TUNGSTEN CARBIDE; ISOMERIZATION; CONVERSION
 Abstract: Constant COx-free H2 production from the catalytic decomposition of ammonia could be achieved over a high-surface-area molybdenum carbide catalyst prepared by a temperature-programmed reduction–carburization method. The fresh and used catalyst was characterized by N2 adsorption/desorption, powder X-ray diffraction, scanning and transmission electron microscopy, and electron energy-loss spectroscopy at different stages. Observed deactivation (in the first 15 h) of the high-surface-area carbide during the reaction was ascribed to considerable reduction of the specific surface area due to nitridation of the carbide under the reaction conditions. Theoretical calculations confirm that the N atoms tend to occupy subsurface sites, leading to the formation of nitride under an NH3 atmosphere. The relatively high rate of reaction (30 mmol/((g of cat.) min)) observed for the catalytic decomposition of NH3 is ascribed to highly energetic sites (twin boundaries, stacking faults, steps, and defects) which are observed in both the molybdenum carbide and nitride samples. The prevalence of such sites in the as-synthesized material results in a much higher H2 production rate in comparison with that for previously reported Mo-based catalysts.

Details

show
hide
Language(s): eng - English
 Dates: 2013-03-06
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1021/ja309734u
ISSN: 0002-7863
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Journal of the American Chemical Society
  Other : J. Am. Chem. Soc.ABBREVIATION
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 135 (9) Sequence Number: - Start / End Page: 3458 - 3464 Identifier: ISSN: 0002-7863
CoNE: https://pure.mpg.de/cone/journals/resource/954925376870