title: Quadrupolar magic angle spinning NMR spectra fitted using the Pearson IV function.
abstract: The Pearson IV function was used to fit the asymmetric solid-state (27)Al NMR spectra of alumina based catalysts. A high convergence (correlation coefficient is no less than 0.997) between experimental and simulated spectra was achieved. The decomposition of the (27)Al NMR spectra of zinc/aluminum mixed oxides with different Zn/Al molar ratio revealed an increased fraction (6-9%) of pentacoordinated aluminum atoms in these oxides as compared to γ-Al2O3. As the Zn/Al ratio is raised, the fraction of [AlO6] octahedral units decreases, while the fraction of [AlO4] tetrahedra increases.
authors.affiliation: Institute of Hydrocarbons Processing, Siberian Branch of Russian Academy of Sciences, Neftezavodskaya st., 54, 644040 Omsk, Russia; Omsk F.M. Dostoevsky State University, pr. Mira, 55a, 644077 Omsk, Russia. Electronic address: ch-mrm@mail.ru.
authors.forename: Roman M
authors.initials: RM
authors.lastname: Mironenko
authors.affiliation: Institute of Hydrocarbons Processing, Siberian Branch of Russian Academy of Sciences, Neftezavodskaya st., 54, 644040 Omsk, Russia; Omsk State Technical University, pr. Mira, 11, 644050 Omsk, Russia.
authors.forename: Olga B
authors.initials: OB
authors.lastname: Belskaya
authors.affiliation: Institute of Hydrocarbons Processing, Siberian Branch of Russian Academy of Sciences, Neftezavodskaya st., 54, 644040 Omsk, Russia.
authors.forename: Valentin P
authors.initials: VP
authors.lastname: Talsi
authors.affiliation: Institute of Hydrocarbons Processing, Siberian Branch of Russian Academy of Sciences, Neftezavodskaya st., 54, 644040 Omsk, Russia; Omsk Scientific Centre, Siberian Branch of Russian Academy of Sciences, pr. Marksa, 15, 644024 Omsk, Russia.
authors.forename: Vladimir A
authors.initials: VA
authors.lastname: Likholobov
keywords: Alumina; Pearson IV function; Quadrupolar NMR; Spectra fitting; Zinc/aluminum oxides