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Study of MgO Transformation into MgF2 in the Presence of CF2Cl2 Full article

Journal Journal of the Serbian Chemical Society
ISSN: 0352-5139 , E-ISSN: 1820-7421
Output data Year: 2017, Volume: 82, Number: 5, Pages: 523-538 Pages count : 16 DOI: 10.2298/JSC161020037V
Tags Acid sites, Aerogels, Destructive sorption, Freon-12, Spin probe, Vanadium
Authors Vedyagin Aleksey A. 1,2 , Bedilo Alexander F. 1,3 , Mishakov Ilya V. 1,2 , Shuvarakova Ekaterina I. 1,3
Affiliations
1 Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2 National Research Tomsk Polytechnic University, Tomsk, Russia
3 Novosibirsk Institute of Technology, Moscow State University of Design and Technology, Novosibirsk, Russia

Funding (2)

1 Russian Foundation for Basic Research 15-03-08070
2 Federal Agency for Scientific Organizations 0303-2016-0014

Abstract: Alkaline-earth metal oxide aerogels prepared by sol–gel method followed by autoclave drying are nanocrystalline mesoporous materials with high reactivity. Bulk solid-state reaction of MgO aerogels with CF2Cl2 takes place after a long induction period, during which the active sites are accumulated on the surface of the nanoparticles. It was found that vanadium addition has a promoting effect on this reaction accelerating the process of the active sites formation. A method for characterization of electron-acceptor sites by electron spin resonance spectroscopy using perylene as the spin probe was developed. A good correlation was observed between the rate of the CF2Cl2 destructive sorption and the concentration of weak electron-acceptor sites. Simplified models of such sites were suggested. The acid sites on the modified MgO surface were supposed to be originated from separation of the charged fragments resulting in the surface polarization. Uncompensated oxygen substitution for chlorine and/or fluorine ions leads to appearance of Lewis acid sites while HCl/HF chemisorption results in Bronsted acid sites formation.
Cite: Vedyagin A.A. , Bedilo A.F. , Mishakov I.V. , Shuvarakova E.I.
Study of MgO Transformation into MgF2 in the Presence of CF2Cl2
Journal of the Serbian Chemical Society. 2017. V.82. N5. P.523-538. DOI: 10.2298/JSC161020037V WOS Scopus РИНЦ AN OpenAlex
Files: Full text from publisher
Dates:
Submitted: Nov 20, 2016
Accepted: Mar 10, 2017
Identifiers:
Web of science: WOS:000408085400005
Scopus: 2-s2.0-85021730275
Elibrary: 31032296
Chemical Abstracts: 2017:1754066
OpenAlex: W2604169763
Citing:
DB Citing
Web of science 8
Scopus 11
Elibrary 12
OpenAlex 10
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