D
Dieter Freude
Researcher at Leipzig University
Publications - 198
Citations - 6325
Dieter Freude is an academic researcher from Leipzig University. The author has contributed to research in topics: Catalysis & Zeolite. The author has an hindex of 45, co-authored 195 publications receiving 5880 citations. Previous affiliations of Dieter Freude include Russian Academy of Sciences.
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Journal ArticleDOI
Nuclear magnetic resonance studies on the acidity of zeolites and related catalysts
TL;DR: In this paper, a review is given on the possibilities of various nuclear magnetic resonance techniques which have been applied up till now to study quantitatively the acidity of zeolites and related catalysts.
Journal ArticleDOI
NMR intensity measurements of half-integer quadrupole nuclei
TL;DR: In this article, the intensity of a half-integer spin nucleus subject only to the quadrupolar interaction is calculated as a function of the length τ of the on-resonance excitation pulse and quadrupole coupling paramters.
Journal ArticleDOI
Magic-angle spinning nuclear magnetic resonance studies of water molecules adsorbed on Brønsted- and Lewis-acid sites in zeolites and amorphous silica–aluminas
TL;DR: In this article, the presence of different types of acidic centres can be ascertained by proton magic-angle spinning nuclear magnetic resonance (1H MAS NMR) measurements on weakly rehydrated dealuminated zeolites and amorphous silica-aluminas.
Journal ArticleDOI
1H MAS NMR studies on the acidity of zeolites
TL;DR: In this paper, the strength of acidity of bridging OH groups increases with the Si/Al ratio from 1.4 to 7 but remains constant above Si/al ~10, and two signals of acidic hydroxyl protons observed in zeolites HY are correlated with the so-called high and low frequency band in infrared spectroscopy.
Book ChapterDOI
Quadrupole Effects in Solid-State Nuclear Magnetic Resonance
Dieter Freude,Jürgen Haase +1 more
TL;DR: The applicability of nuclear magnetic resonance (NMR) spectroscopy continues to expand in physics, chemistry, material science, geology, biology, and medicine as discussed by the authors, most becoming possible because of the high magnetic fields of superconducting magnets (almost an order of magnitude higher than ordinary iron magnets).