Formation and partial self-healing of lattice defects during thermal treatments of GaZSM-5: An FTIR study using CO as a probe molecule

文献信息

发布日期 2001-03-08
DOI 10.1039/B008558H
影响因子 3.676
作者

C. Otero Areán, B. Bonelli, G. Turnes Palomino, A. M. Canaleta Safont, E. Garrone


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摘要

Room temperature adsorption of CO on H-GaZSM-5 occurs on both Brønsted and Lewis acid sites. On Brønsted acid sites, CO adsorption leads to an equilibrium between Z–OH···CO and Z–OH···OC species, where Z stands for the zeolite framework. Corresponding C–O stretching frequencies are 2168 and 2122 cm−1, respectively. Lewis acid sites, formed as a consequence of gallium loss during thermal treatment of the zeolite at 973 K in vacuum, appear to consist of Ga3+ and Ga+ ions; some zerovalent gallium can also be formed. Further heat treatment under oxygen seems to restore some of the gallium atoms to the zeolite framework, by a mechanism which is thought to involve the volatile gallium(I) oxide.

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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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