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

Abstract

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.

Authors:
; ; ;  [1]; ;  [2]
  1. Osaka Univ. (Japan)
  2. Idemitsu Kosan Co. Ltd., Chiba (Japan)
Publication Date:
OSTI Identifier:
5819857
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry; (USA)
Additional Journal Information:
Journal Volume: 95:1; Journal ID: ISSN 0022-3654
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Okamoto, Yasuaki, Nagata, Kozo, Adachi, Toshinori, Imanaka, Toshinobu, Inamura, Kazuhiro, and Takyu, Toshiyuki. Preparation and characterization of highly dispersed cobalt oxide and sulfide catalysts supported on SiO sub 2. United States: N. p., 1991. Web. doi:10.1021/j100154a057.
Okamoto, Yasuaki, Nagata, Kozo, Adachi, Toshinori, Imanaka, Toshinobu, Inamura, Kazuhiro, & Takyu, Toshiyuki. Preparation and characterization of highly dispersed cobalt oxide and sulfide catalysts supported on SiO sub 2. United States. https://doi.org/10.1021/j100154a057
Okamoto, Yasuaki, Nagata, Kozo, Adachi, Toshinori, Imanaka, Toshinobu, Inamura, Kazuhiro, and Takyu, Toshiyuki. 1991. "Preparation and characterization of highly dispersed cobalt oxide and sulfide catalysts supported on SiO sub 2". United States. https://doi.org/10.1021/j100154a057.
@article{osti_5819857,
title = {Preparation and characterization of highly dispersed cobalt oxide and sulfide catalysts supported on SiO sub 2},
author = {Okamoto, Yasuaki and Nagata, Kozo and Adachi, Toshinori and Imanaka, Toshinobu and Inamura, Kazuhiro and Takyu, Toshiyuki},
abstractNote = {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.},
doi = {10.1021/j100154a057},
url = {https://www.osti.gov/biblio/5819857}, journal = {Journal of Physical Chemistry; (USA)},
issn = {0022-3654},
number = ,
volume = 95:1,
place = {United States},
year = {Thu Jan 10 00:00:00 EST 1991},
month = {Thu Jan 10 00:00:00 EST 1991}
}