Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 119, Issue 49, Pages 27410-27415Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b09759
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Funding
- Ministry of Education and Science of the Russian Federation [02.G25.31.0053]
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Quantitative electron paramagnetic resonance (EPR) measurements were done on the alumina oxide surface by using 9,10-anthraquinone probe (AQ) with the AQ amount in the range of (0.5-20) wt %. The nature of three paramagnetic centers observed simultaneously is ascribed to the strong, medium, and weak Al Lewis acid sites on the basis of combined EPR study/infrared (IR) spectroscopy of the adsorbed CO and pyridine/temperature-programmed desorption (TPD) of ammonia. It is shown how the optimal concentration of AQ probe molecule for the exhaustive quantitative examination of alumina surface can be determined directly from EPR A possibility to characterize the surface distribution of Lewis acid centers by AQ molecules is discussed.
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