Br⊘nsted Acid Sites in Zeolites Characterized by Multinuclear Solid-State NMR Spectroscopy

IF 9.3 2区 化学 Q1 CHEMISTRY, PHYSICAL Catalysis Reviews-Science and Engineering Pub Date : 1997-11-01 DOI:10.1080/01614949708007100
M. Hunger
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引用次数: 259

Abstract

Abstract Nearly all atoms contributing to the local structure of Br⊘nsted acid sites in zeolites exhibit isotopes accessible for multinuclear solid-state nuclear magnetic resonance (NMR) investigations. Therefore, in the last 15 years, NMR spectroscopy has found numerous applications for the determination of the types of hydroxyl proton in zeolites, of their concentration, accessibility, and mobility, and for the characterization of their acid strength and local structure. It allows the study of the role of hydroxyl groups in the formation of adsorbate complexes and in heterogeneously catalyzed reactions. Meanwhile, NMR spectroscopy belongs to the most powerful techniques for the characterization of Br⊘nsted acid sites in zeolites and related materials. The basis of this success is the invention of new sample preparation techniques, external magnetic fields with high-flux densities, effective line-narrowing methods, and new two-dimensional experiments, making the detection of highly resolved solid-state N...
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Br⊘沸石中嵌顿酸位的多核固体核磁共振表征
几乎所有参与沸石中Br⊘嵌固酸位局部结构的原子都表现出可用于多核固体核磁共振(NMR)研究的同位素。因此,在过去的15年中,核磁共振光谱已经发现了许多应用,用于确定沸石中羟基质子的类型,它们的浓度,可及性和迁移性,以及它们的酸强度和局部结构的表征。它允许研究羟基在形成吸附配合物和多相催化反应中的作用。同时,核磁共振波谱是表征沸石及相关材料中Br⊘嵌顿酸位最有力的技术。这一成功的基础是发明了新的样品制备技术,高通量密度的外部磁场,有效的线窄化方法,以及新的二维实验,使得高分辨率固态氮的检测…
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来源期刊
CiteScore
22.30
自引率
2.80%
发文量
29
期刊介绍: Catalysis Reviews is dedicated to fostering interdisciplinary perspectives in catalytic science and engineering, catering to a global audience of industrial and academic researchers. This journal serves as a bridge between the realms of heterogeneous, homogeneous, and bio-catalysis, providing a crucial and critical evaluation of the current state of catalytic science and engineering. Published topics encompass advances in technology and theory, engineering and chemical aspects of catalytic reactions, reactor design, computer models, analytical tools, and statistical evaluations.
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