Characterization of the acidity of Mu-14 by solid-state NMR and NH3-STD

文献信息

发布日期 2001-01-23
DOI 10.1039/B008553G
影响因子 3.676
作者

Angélique Simon, Jean-Louis Paillaud, Valentin Valtchev, Henri Kessler


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摘要

The distribution and strength of the Brönsted acid sites in three Mu-14 (ITE structure type) samples with different Si/Al ratios (17, 28 and 35) were studied by 1H MAS (magic angle spinning), 1H-{27Al} TRAPDOR (transfer of population in double resonance), 1H-29Si CP-MAS (cross-polarisation magic angle spinning)/ HETCOR (two-dimensional heteronuclear correlation) NMR, and NH3-STD (stepwise thermal desorption). The 1H MAS NMR spectra exhibit two different types of bridging OH groups associated with proton chemical shifts of ca. 4.2 and 5.3 ppm. From the 1H-29Si HETCOR experiments a single Brönsted [Si-(OSi)3(OAl)1] Q3 site resonating at δ(29Si) = − 108 ppm, can be distinguished from two different [Si-(OSi)3(OH)1] Q3 sites, at δ(29Si) = − 101 and − 104 ppm, and one of the Q4 sites resonating at δ(29Si) = − 108.5 ppm. Aluminum is not randomly distributed in the structure of Mu-14, but rather sits at preferred places isolated from silanols. The acid strength of the Brönsted acid sites, determined by NH3-STD, is slightly higher in Mu-14 than in a HZSM-5 with a similar Si/Al ratio.

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来源期刊

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
自引率: 10.3%
年发文量: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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