Chromium silsesquioxane based synthesis and characterization of a microporous Cr–Si–O material

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Publication Date
DOI 10.1039/A903684I
Impact Factor 3.676
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Abstract

The controlled calcination of the chromium containing polyhedral oligosilsesquioxane (c-C5H9)7Si7O9- (OSiMe3)O2CrO2, 3b, monitored by MS analysis of the evolved gases and thermogravimetry measurements, led to the formation of a microporous Cr–Si–O amorphous mixed oxide containing 10.2 wt.% of chromium. The textural properties of the material as well as the speciation and dispersion of the chromium oxide on the silica surface were investigated by the use of nitrogen physical adsorption, XRD, XPS as well as DRS, RS and IR techniques. The nitrogen physical adsorption indicates a high surface area, a rather large pore volume and a very narrow pore size distribution around 6 Å diameter. The spectroscopic analysis of the material suggests a rather high dispersion of the chromium oxide species on the silica surface mainly as monochromate and to a certain extent as dichromate and clusters of Cr2O3. The material was briefly tested in the ammonia oxidation reaction and was found to have a catalytic activity, which was slightly higher than that of a chromium oxide on a silica reference catalyst.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
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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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