Preparation and characterization of highly dispersed cobalt oxide and sulfide catalysts supported on SiO sub 2

Journal Article · Thu Jan 10 00:00:00 EST 1991 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100154a057· OSTI ID:5819857

Okamoto, Yasuaki; Nagata, Kozo; Adachi, Toshinori; Imanaka, Toshinobu ^[1]; Inamura, Kazuhiro; Takyu, Toshiyuki ^[2]

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1. Osaka Univ. (Japan)
2. Idemitsu Kosan Co. Ltd., Chiba (Japan)

Physicochemical characterization of calcined and sulfided CoO/SiO{sub 2} catalysts were carried out to reveal the interaction modes between cobalt and SiO{sub 2} using XPS, TPR, TEM, DRS-VIS, and XRD techniques. The CoO/SiO{sub 2} catalysts were prepared by an impregnation method using cobalt acetate as well as cobalt nitrate and by an ion-exchange technique. It was found that several kinds of cobalt species are formed on CoO/SiO{sub 2}. These species are assigned to Co{sub 3}O{sub 4}, Co-Si-O mixed oxide, surface Co{sup 3+} species, surface silicate, surface Co{sup 2+} species in the order of the TPR reduction temperature. Their proportions strongly depended on the starting salt, cobalt content, and preparation method. Cobalt acetate was found to provide highly dispersed CoO/SiO{sub 2} catalysts with a uniform distribution of cobalt species throughout the catalyst particles as compared to conventionally employed cobalt nitrate. The proportion of Co{sup 3+} greatly decreases when cobalt acetate was used instead of cobalt nitrate. All the cobalt species interacting with SiO{sub 2} were found to be sulfided at 673 K.

• OSTI ID: 5819857
• Journal Information: Journal of Physical Chemistry; (USA), Vol. 95:1; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
COBALT OXIDES
CHEMICAL PREPARATION
STRUCTURAL CHEMICAL ANALYSIS
COBALT SULFIDES
EXPERIMENTAL DATA
MEASURING METHODS
PHOTOELECTRON SPECTROSCOPY
POROSITY
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
CHALCOGENIDES
COBALT COMPOUNDS
COHERENT SCATTERING
DATA
DIFFRACTION
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
INFORMATION
MICROSCOPY
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
SCATTERING
SPECTROSCOPY
SULFIDES
SULFUR COMPOUNDS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
020400* - Petroleum- Processing