The application of 1,3,5-trinitrobenzene as a spin probe for the surface basic sites study of MgAl double oxides by EPR spectroscopy

被引：2
|
作者：
Yurpalov, Vyacheslav L. [1 ]
Stepanova, Liudmila N. [1 ]
Drozdov, Vladimir A. [1 ]
Belskaya, Olga B. [1 ,2 ]
机构：
[1] Russian Acad Sci, Ctr New Chem Technol, Fed Res Ctr, Boreskov Inst Catalysis,Siberian Branch, 54 Neftezavodskaya St, Omsk 644040, Russia
[2] Omsk State Tech Univ, Dept Chem Technol, 11 Mira Av, Omsk 644050, Russia
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2020年 / 596卷
基金：
俄罗斯基础研究基金会;
关键词：
Basicity; EPR spectroscopy; MgAl double oxide; Spin probe; 1,3,5-Trinitrobenzene radical anion; ELECTRON-DONOR SITES; ADSORPTION; RESONANCE; GAMMA-AL2O3; GENERATION; COMPLEXES; CATALYSTS; RADICALS; REMOVAL; SOLVENT;
D O I：
10.1016/j.colsurfa.2020.124733
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In current work the features of 1,3,5-trinitrobenzene (TNB) transformation into paramagnetic products on the surface of aluminum/magnesium oxides calcined at 550 degrees C, as well as MgAl double oxides, were investigated by EPR spectroscopy. It was shown that the increase of basicity (i.e. MgO content) leads to the increase in the concentration of formed radical anions, wherein the presence of acidic sites contributes to their stabilization on the surface. The effect of n-hexane and toluene used as solvents in the transformation of adsorbed TNB radical anions was established, and a new probe EPR technique for using TNB to determine the concentration of the basic sites in MgAl double oxides was proposed. The results of the proposed technique are in good agreement with the data on the basic sites concentration obtained from the adsorption capacity CO2 of the corresponding samples.
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页数：9
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