Abstract: Mesoporous nanocrystalline MgO aerogels possess high surface areas and outstanding reactivity with respect to variety of harmful organic substances. The catalytic activity of MgO aerogels in dehydrochlorination of 1-chlorobutane substantially increases with time due to partial MgO conversion to MgCl2. This increase and decrease of the surface area indicate that more active catalytic sites are formed on the surface during this reaction. Recently we reported that weak electron-acceptor sites formed due to the MgO halogenation may be responsible for the solid-state reaction between MgO aerogels and CF2Cl2. In this study we characterized by EPR weak electron-acceptor sites formed during this reaction using perylene as a spin probe. The catalytic activity was found to increase significantly during the 1-chlorobutane dehydrochlorination reaction, which is accompanied by the MgO modification with chloride ions. No electron-acceptor sites were observed on the surface of initial MgO samples. They appeared only during the reaction. A good correlation was observed between the catalytic activity and the concentration of weak electron-acceptor sites tested using perylene. The obtained results indicate that they are likely to be the active sites accounting for 1-chlorobutane dehydrochlorination in the active state of the catalyst.

Cite: Shuvarakova E.I. , Bedilo A.F. , Akimova T.N. , Kenzhin R.M. , Chesnokov V.V.
Catalytic Dehydrochlorination of 1-Chlorobutane over Mesoporous MgO Aerogels: The Role of Electron-Acceptor Sites
In compilation International Porous and Powder Materials Symposium and Exhibition PPM 2015 : Proceedings. – Uc Adim Printing House., 2015. – C.218-222. – ISBN 9789756590072.

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