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Pyridine, a base of moderate base strength, is used to distinguish between not only Lewis and Bronsted acid sites on solid surfaces, but also strong and weak Bronsted acids (33). When it is protonated to pyridinium (C5H5NH ), the diagnostic N -H deformation band appears in the region 1535-1550 cm and... [Pg.37]

See other pages where Acidic sites on solid surfaces is mentioned: [Pg.345] [Pg.662]