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

Title: NOVEL SUPPORTED BIMETALLIC CARBIDE CATALYSTS FOR COPROCESSING OF COAL WITH WASTE MATERIALS

Abstract

A new family of bimetallic oxynitride compounds, M I-MII-O-N (MI, MII = Mo, W, V, Nb, Cr, Mn and Co), has been synthesized by nitriding bimetallic oxide precursors with ammonia gas via a temperature programmed reaction. The oxide precursors are prepared by conventional solid state reaction between two appropriate monometallic oxides. The synthesis involves passing NH3 gas over the oxide precursors at a flow rate of 6.80x102 {micro}mol s-1 (1000 cm3/min), and raising the temperature at a heating rate of 8.3x10-2 K s-1 (5 K/min) to a final temperature (Tf) which is held constant for a short period of time (thold). The oxynitrides thus obtained are pyrophoric and need to be passivated before exposing them to air. All these new bimetallic oxynitrides have a face centered cubic (fcc) crystal structure and high values of surface area. The surface reactivation and the thermal stability of the materials are studied by temperature programmed reduction (TPR) and this indicates that the compounds can be divided into three groups of different reducibility (high, medium, low). Their surface activity and surface area are evaluated based on CO chemisorption and N2 physisorption measurements. It is found that the chemisorbed CO number density correlates with the reducibilitymore » of the compounds. The bimetallic catalysts were studied in hydroprocessing at realistic conditions (3.1 MPa and 643 K). Activity also correlated with reducibility of the compounds. A V-Mo composition had greater HDN conversion than a commercial Ni-Mo sulfide catalyst.« less

Publication Date:
Research Org.:
Federal Energy Technology Center (FETC), Morgantown, WV, and Pittsburgh, PA
Sponsoring Org.:
USDOE
OSTI Identifier:
7488
Report Number(s):
DE-FG26-97FT97265-02
ON: DE00007488
DOE Contract Number:  
FG26-97FT97265
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
40 CHEMISTRY; 01 COAL, LIGNITE, AND PEAT; Carbides; Catalysts; Oxides; Nitrides

Citation Formats

. NOVEL SUPPORTED BIMETALLIC CARBIDE CATALYSTS FOR COPROCESSING OF COAL WITH WASTE MATERIALS. United States: N. p., 1998. Web. doi:10.2172/7488.
. NOVEL SUPPORTED BIMETALLIC CARBIDE CATALYSTS FOR COPROCESSING OF COAL WITH WASTE MATERIALS. United States. https://doi.org/10.2172/7488
. Wed . "NOVEL SUPPORTED BIMETALLIC CARBIDE CATALYSTS FOR COPROCESSING OF COAL WITH WASTE MATERIALS". United States. https://doi.org/10.2172/7488. https://www.osti.gov/servlets/purl/7488.
@article{osti_7488,
title = {NOVEL SUPPORTED BIMETALLIC CARBIDE CATALYSTS FOR COPROCESSING OF COAL WITH WASTE MATERIALS},
author = {},
abstractNote = {A new family of bimetallic oxynitride compounds, MI-MII-O-N (MI, MII = Mo, W, V, Nb, Cr, Mn and Co), has been synthesized by nitriding bimetallic oxide precursors with ammonia gas via a temperature programmed reaction. The oxide precursors are prepared by conventional solid state reaction between two appropriate monometallic oxides. The synthesis involves passing NH3 gas over the oxide precursors at a flow rate of 6.80x102 {micro}mol s-1 (1000 cm3/min), and raising the temperature at a heating rate of 8.3x10-2 K s-1 (5 K/min) to a final temperature (Tf) which is held constant for a short period of time (thold). The oxynitrides thus obtained are pyrophoric and need to be passivated before exposing them to air. All these new bimetallic oxynitrides have a face centered cubic (fcc) crystal structure and high values of surface area. The surface reactivation and the thermal stability of the materials are studied by temperature programmed reduction (TPR) and this indicates that the compounds can be divided into three groups of different reducibility (high, medium, low). Their surface activity and surface area are evaluated based on CO chemisorption and N2 physisorption measurements. It is found that the chemisorbed CO number density correlates with the reducibility of the compounds. The bimetallic catalysts were studied in hydroprocessing at realistic conditions (3.1 MPa and 643 K). Activity also correlated with reducibility of the compounds. A V-Mo composition had greater HDN conversion than a commercial Ni-Mo sulfide catalyst.},
doi = {10.2172/7488},
url = {https://www.osti.gov/biblio/7488}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {11}
}