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Title: Characterization and Hydrodesulfurization Properties of Catalysts Derived from Amorphous Metal-boron Materials

Abstract

Unsupported and silica-supported amorphous metal-boron materials (Ni-B, Mo-O-B, and Ni-Mo-O-B) were prepared by NaBH4 reduction of aqueous or impregnated metal salts. The resulting materials were characterized by a range of techniques, including conventional and time-resolved X-ray diffraction. The latter technique was used to determine the onset of crystallization of the amorphous materials during annealing in He flow and to identify the phases formed. Annealing of unsupported Ni-B resulted in the crystallization of predominantly Ni3B, followed by Ni metal, whereas Ni-B/SiO2 formed Ni and then NiO. There was no evidence for crystallization of B-containing phases for Mo-O-B or Mo-O-B/SiO2 on annealing; instead, the predominant phase formed was MoO2. In general, the phases formed for Ni-Mo-O-B and Ni-Mo-O-B/SiO2 were consistent with those formed in the monometallic materials, but at higher annealing temperatures. Catalysts prepared by sulfiding Ni-B/SiO2 and Ni-Mo-O-B/SiO2 materials had significantly higher thiophene HDS activities than conventionally prepared sulfided Ni/SiO2 and Ni-Mo/SiO2 catalysts, whereas a sulfided Mo-O-B/SiO2 catalyst had a dramatically lower HDS activity than a sulfided Mo/SiO2 catalyst.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
949940
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Catalysis, 246(2):277-292
Country of Publication:
United States
Language:
English
Subject:
Environmental Molecular Sciences Laboratory

Citation Formats

Parks, Greg, Pease, Melissa, Layman, Kathryn A., Burns, Autumn W., Bussell, Mark E., Wang, Xianqin, Hanson, Jonathan, and Rodriguez, Jose A. Characterization and Hydrodesulfurization Properties of Catalysts Derived from Amorphous Metal-boron Materials. United States: N. p., 2007. Web. doi:10.1016/j.jcat.2006.12.009.
Parks, Greg, Pease, Melissa, Layman, Kathryn A., Burns, Autumn W., Bussell, Mark E., Wang, Xianqin, Hanson, Jonathan, & Rodriguez, Jose A. Characterization and Hydrodesulfurization Properties of Catalysts Derived from Amorphous Metal-boron Materials. United States. doi:10.1016/j.jcat.2006.12.009.
Parks, Greg, Pease, Melissa, Layman, Kathryn A., Burns, Autumn W., Bussell, Mark E., Wang, Xianqin, Hanson, Jonathan, and Rodriguez, Jose A. Mon . "Characterization and Hydrodesulfurization Properties of Catalysts Derived from Amorphous Metal-boron Materials". United States. doi:10.1016/j.jcat.2006.12.009.
@article{osti_949940,
title = {Characterization and Hydrodesulfurization Properties of Catalysts Derived from Amorphous Metal-boron Materials},
author = {Parks, Greg and Pease, Melissa and Layman, Kathryn A. and Burns, Autumn W. and Bussell, Mark E. and Wang, Xianqin and Hanson, Jonathan and Rodriguez, Jose A.},
abstractNote = {Unsupported and silica-supported amorphous metal-boron materials (Ni-B, Mo-O-B, and Ni-Mo-O-B) were prepared by NaBH4 reduction of aqueous or impregnated metal salts. The resulting materials were characterized by a range of techniques, including conventional and time-resolved X-ray diffraction. The latter technique was used to determine the onset of crystallization of the amorphous materials during annealing in He flow and to identify the phases formed. Annealing of unsupported Ni-B resulted in the crystallization of predominantly Ni3B, followed by Ni metal, whereas Ni-B/SiO2 formed Ni and then NiO. There was no evidence for crystallization of B-containing phases for Mo-O-B or Mo-O-B/SiO2 on annealing; instead, the predominant phase formed was MoO2. In general, the phases formed for Ni-Mo-O-B and Ni-Mo-O-B/SiO2 were consistent with those formed in the monometallic materials, but at higher annealing temperatures. Catalysts prepared by sulfiding Ni-B/SiO2 and Ni-Mo-O-B/SiO2 materials had significantly higher thiophene HDS activities than conventionally prepared sulfided Ni/SiO2 and Ni-Mo/SiO2 catalysts, whereas a sulfided Mo-O-B/SiO2 catalyst had a dramatically lower HDS activity than a sulfided Mo/SiO2 catalyst.},
doi = {10.1016/j.jcat.2006.12.009},
journal = {Journal of Catalysis, 246(2):277-292},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 22 00:00:00 EST 2007},
month = {Mon Jan 22 00:00:00 EST 2007}
}