Nanocrystalline Carbon Coated Alumina with Enhanced Phase Stability at High Temperatures | Sciact - CRIS-system of Boreskov Institute of Catalysis

Nanocrystalline Carbon Coated Alumina with Enhanced Phase Stability at High Temperatures Full article

Journal

RSC Advances
ISSN: 2046-2069

Output data

Year: 2017, Volume: 7, Number: 86, Pages: 54852-54860 Pages count : 9 DOI: 10.1039/c7ra08841h

Tags

THERMODYNAMIC STABILITY; DESTRUCTIVE SORPTION; OPTICAL-PROPERTIES; ELECTRON-DONOR; GAMMA-ALUMINA; SURFACE-AREA; MgO; GRAPHITE; SITES; GAMMA-Al2O3

Authors

Volodin Alexander M. ¹ , Bedilo Alexander F. ^1,2 , Stoyanovskii Vladimir O. ¹ , Zaikovskii Vladimir I. ^1,3 , Kenzhin Roman M. ¹ , Mishakov Ilya V. ^1,4 , Vedyagin Aleksey A. ^1,4

Affiliations

1	Boreskov Institute of Catalysis SB RAS, Pr. Ac. Lavrentieva 5, Novosibirsk, 630090, Russian Federation
2	Novosibirsk Institute of Technology, Kosygin Russian State University, Krasny pr. 35, Novosibirsk, 630099, Russian Federation
3	Novosibirsk State University, Pirogova str. 2, Novosibirsk, 630090, Russian Federation
4	National Research Tomsk Polytechnic University, Lenin Av. 30, Tomsk, 634050, Russian Federation

Funding (1)

Russian Science Foundation

16-13-10168

A comparative investigation of the phase stability at high temperatures of nanocrystalline Al2O3 and carbon-coated Al2O3@C systems was performed using a set of physicochemical and spectroscopic methods. The obtained data demonstrate that the carbon coating hinders the sintering of the d-Al2O3 phase and its transformation to the a-Al2O3 phase at 1250 _C. Without the carbon coating, the d-Al2O3 sinters and becomes completely converted to corundum at noticeably lower temperatures. The stabilization of the nanosized oxide particles in the Al2O3@C system was shown to be the decisive factor preventing their transformation to the a-Al2O3 phase. The thermal stability of the Al2O3@C samples calcined within a range of 1180–1250 _C in an argon atmosphere followed by the calcination in air to remove the carbon coating was found to exceed that of pure d-Al2O3. Such samples are characterized by the presence of carbon–alumina interfaces, when carbon is encapsulated in small amounts at the places of contact between the oxide nanoparticles. Such interfaces hinder the sintering of alumina nanoparticles. It is important that the active sites present on the surface of the oxide core in Al2O3@C samples calcined in air are similar to those known for pure alumina. The high concentration of such sites after thermal treatment at elevated temperatures makes this class of materials promising for use as catalysts or catalyst supports capable of operating at high temperatures.

Volodin A.M. , Bedilo A.F. , Stoyanovskii V.O. , Zaikovskii V.I. , Kenzhin R.M. , Mishakov I.V. , Vedyagin A.A.
Nanocrystalline Carbon Coated Alumina with Enhanced Phase Stability at High Temperatures

RSC Advances. 2017. V.7. N86. P.54852-54860. DOI: 10.1039/c7ra08841h WOS Scopus РИНЦ AN OpenAlex

Full text from publisher

Submitted:	Aug 10, 2017
Accepted:	Nov 27, 2017
Published online:	Dec 1, 2017

Web of science:	WOS:000416827600066
Scopus:	2-s2.0-85037027482
Elibrary:	32231371
Chemical Abstracts:	2017:1897065
OpenAlex:	W2774521692

DB	Citing
Web of science	19
Scopus	21
Elibrary	21
OpenAlex	25