Characterization of Electron-Acceptor Sites on the Surface of Sulfated and Chlorinated Alumina by EPR using Spin Probes - Conference attendances | Sciact - CRIS-system of Boreskov Institute of Catalysis

Characterization of Electron-Acceptor Sites on the Surface of Sulfated and Chlorinated Alumina by EPR using Spin Probes Conference attendances

Language

Английский

Participant type

Стендовый

Conference

EuropaCat-XII: 12th European Congress on Catalysis “Catalysis: Balancing the use of fossil and renewable resources”
30 Aug - 4 Sep 2015 , Казань

Authors

Shuvarakova Ekaterina Igorevna ^1,2 , Bedilo Alexander Fedorovich ^1,2

Affiliations

1	Boreskov Institute of Catalysis SB RAS
2	Novosibirsk Institute of Technology — branch of The Kosygin State University of Russia

Alumina modification with sulfates was found to result in a gradual increase of the concentration of electron-acceptor sites characterized using the formation of radical cations from aromatic molecules with different ionization potentials. The strongest electron-acceptor sites tested with toluene immediately after adsorption were only detected with a concentration of SO3 not less than 4%. The weakest sites tested with perylene presented on the surface of all the samples, with their concentration on 12% SO3 sample being 3×1019 g -1. Chlorination only led to minor growth of the concentration of the weak sites. Recommendations on the use of spin probes for testing electron-acceptor sites with different strength are suggested. A mechanism of the polycondensation of aromatic probes on the surface electron-acceptor sites explaining experimental results and possible structures of such sites were proposed

Shuvarakova E.I. , Bedilo A.F.
Characterization of Electron-Acceptor Sites on the Surface of Sulfated and Chlorinated Alumina by EPR using Spin Probes
EuropaCat-XII: 12th European Congress on Catalysis “Catalysis: Balancing the use of fossil and renewable resources” 30 Aug - 4 Sep 2015