δ-Alumina Supported Cobalt Catalysts Promoted by Ruthenium for Fischer-Tropsch Synthesis | Sciact - CRIS-system of Boreskov Institute of Catalysis

δ-Alumina Supported Cobalt Catalysts Promoted by Ruthenium for Fischer-Tropsch Synthesis Full article

Journal

Applied Catalysis A: General
ISSN: 0926-860X , E-ISSN: 1873-3875

Output data

Year: 2017, Volume: 539, Pages: 48-58 Pages count : 11 DOI: 10.1016/j.apcata.2017.04.003

Tags

Cobalt-alumina catalysts, Cobalt-ruthenium alloy, Fischer-Tropsch synthesis, Promotion, Ruthenium

Authors

Kungurova Olga A. ^1,2,3 , Khassin Alexander A. ^1,4 , Cherepanova Svetlana V. ^1,2 , Saraev Andrey A. ^1,2 , Kaichev Vasily V. ^1,2 , Shtertser Natalya V. ¹ , Chermashentseva Galina K. ¹ , Gerasimov Еvgeny Yu. ^1,2 , Paukshtis Еvgeny A. ¹ , Vodyankina Оlga V. ³ , Minyukova Tatyana P. ¹ , Abou-Jaoudé Georges ⁴

Affiliations

1	Boreskov Institute of Catalysis, 5, Lavrentieva Ave., Novosibirsk, 630090, Russia
2	Novosibirsk National Research University, 2, Pirogova Str., Novosibirsk, 630090, Russia
3	Tomsk State University, 36, Lenina Ave., Tomsk, 634050, Russia
4	École polytechnique fédérale de Lausanne, Route Cantonale, CH-1015 Lausanne, Switzerland

Funding (1)

Federal Agency for Scientific Organizations

0303-2016-0013

The paper presents the low-temperature nitrogen adsorption, TG, XRD, IR spectroscopy, XPS, TEM and SEM data for ruthenium promoted (0.2–1 wt.%) Сo-δAl2O3 catalysts and characteristics of the catalysts in Fischer-Tropsch synthesis after their activation under the conditions ensuring the reduction of comparable fractions of metallic cobalt. It was shown that cobalt in oxide precursors is a component of the spinel-like Со3-xAlxO4 phase containing the impurity anions СО32−, NO3−, ОН−, and NO in promoted samples, which belong to the thermolysis product of the Ru precursor. Average sizes of Со3-xAlxO4 crystallites are in a range of 5–10 nm. As ruthenium content in the catalyst increases upon reduction, the temperature of metallic phase formation decreases substantially (by more than 150 °C). After the reduction, selectivity of promoted catalysts for α-olefins and high-molecular hydrocarbons was higher in comparison with unpromoted catalysts, without a noticeable decrease in catalytic activity. Therewith, in 0.5-1.0 wt.% catalysts, a part of ruthenium forms individual ultradispersed metallic particles ca. 1 nm in size that are located on the surface of oxide support and are not active in Fischer-Tropsch synthesis. The oxide layer decorating the surface of metallic cobalt particles is also strongly enriched with ruthenium. In the 0.2 wt.% catalyst, the major part of ruthenium resides in metallic cobalt particles. Although the ruthenium-cobalt alloy segregates with enrichment of the surface with cobalt, the presence of ruthenium in the metallic particles and probably in the decorating oxide layer exerts a considerable effect on selectivity of the catalysts.

Kungurova O.A. , Khassin A.A. , Cherepanova S.V. , Saraev A.A. , Kaichev V.V. , Shtertser N.V. , Chermashentseva G.K. , Gerasimov Е.Y. , Paukshtis Е.A. , Vodyankina О.V. , Minyukova T.P. , Abou-Jaoudé G.
δ-Alumina Supported Cobalt Catalysts Promoted by Ruthenium for Fischer-Tropsch Synthesis
Applied Catalysis A: General. 2017. V.539. P.48-58. DOI: 10.1016/j.apcata.2017.04.003 WOS Scopus РИНЦ ANCAN OpenAlex

Submitted:	Jan 16, 2017
Accepted:	Apr 4, 2017
Published online:	Apr 6, 2017
Published print:	Jun 1, 2017

Web of science:	WOS:000402214900006
Scopus:	2-s2.0-85017446133
Elibrary:	29484102
Chemical Abstracts:	2017:779818
Chemical Abstracts (print):	167:58610
OpenAlex:	W2604733252

DB	Citing
Web of science	27
Scopus	29
Elibrary	27
OpenAlex	29