Redox behaviour of SnO2 nanoparticles encapsulated in the pores of zeolites towards reductive gas atmospheres studied by in situ diffuse reflectance UV/Vis and Mössbauer spectroscopy
文献信息
Meike Warnken, Karoly Lázár, Michael Wark
Nanoparticles of SnO2 have been embedded in the pores of faujasite-type NaY zeolites by chemical vapour deposition, ion exchange or impregnation followed by hydrolysis. By transmission electron microscopy and from blue-shifts in optical spectra (diffuse reflectance (DR-UV/Vis)) the sizes of the SnO2 nanoparticles formed by impregnation were determined to be about 3 nm. These samples exhibit the most distinct decreases in the diffuse reflectance and highest rates for changes in the reflectance intensity during reduction with CO. The optical changes can be correlated to the number of oxygen vacancies in the particles, i.e. the deviations from the original stoichiometry SnO2. In contrast to the reduction with H2, after reduction with CO all optical changes are completely reversible by addition of oxygen. The different redox behaviour towards CO and H2 is also confirmed by in situ 119Sn Mössbauer spectroscopy and might be interpreted by the presence of a core of SnO in the nanoparticles prevented against further oxidation by a dense shell of SnO2.
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Physical Chemistry Chemical Physics

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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