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Supports morphological characterization

The characterization of support morphology in the physical state in which the support is used remains problematical. ISEC offers one solution and the provision of a commercially available instrument and associated software would be a big step forward. Again there are signs that this development is underway. Notwithstanding this there remains considerable scope for alternative user-friendly techniques to be developed and this is a challenge for physical chemists and physicists. [Pg.46]

The morphological characterization was carried out by means of HRTEM, on a Jeol 2000 EX instrument operating at 200 kV, and of AFM, on a Park Scientific Instrument Auto Probe LS. Raman spectra of the supports were recorded by using a Renishaw micro-Raman system 1000 spectrometer equipped with a He-Cd laser emitting at 442 nm (22625 cm ). [Pg.722]

Morphological Characterization via Thermal Analysis and Polarized Optical Microscopy Support for Partially Crystallizabie Urethane-Rich Hard Domains... [Pg.117]

Size reduction of metal particles results in several changes of the physico-chemical properties. The primary change is observed in the electronic properties of the metal particles which can be characterized by ultraviolet and X-ray photoelectron spectroscopy (UPS and XPS, respectively) as well as Auger-electron spectroscopy (AES) measurements. Furthermore, morphology of the metal nanoparticles is highly sensitive to the environment, such as ion-metal interaction (e.g. metal-support interaction)... [Pg.77]

Simple Fe porphyrins whose catalytic behavior in the ORR has been smdied fairly extensively are shown in Fig. 18.9. Literature reports disagree substantially in quantitative characterization of the catalytic behavior overpotential, stability of the catalysts, pH dependence, etc.). It seems plausible that in different studies the same Fe porphyrin possesses different axial hgation, which depends on the electrolyte and possibly specific residues on the electrode surface the thicknesses and morphologies of catalytic films may also differ among studies. AU of these factors may contribute to the variabUity of quantitative characteristics. The effect of the supporting surface on... [Pg.655]

This book is divided up into sections. The first three chapters provide a background sections that follow contain chapters dealing with polymer chain analysis, polymer morphology and structure, polymer degradation, polymer product analysis and support techniques. These are listed in more detail in Chapter 1, which also expands more fully on our industrial perception of the requirements for competence and appreciation in all techniques and methods for polymer molecular characterization and analysis. We hope you find this book of value and its approach both unique and technically informative and useful. [Pg.783]

The transmission electron microscope is now well established as a useful tool for the characterization of supported heterogeneous catalysts(l). Axial bright-field imaging in the conventional transmission electron microscope (CTEM) is routinely used to provide the catalyst chemist with details concerning particle size distributions, 3), particle disposition over the support material(2-6) as well as particle morphology(7). Internal crystal structure(8-10), and elemental compositions(ll) may be inferred by direct structure imaging. [Pg.360]

Here, following the works of J.H. De Boer (Delft, The Netherlands, see elsewhere [1,2]), by texture one means the individual geometrical structure of catalysts, supports, and other porous systems (PSs) at the level of pores, particles and their ensembles (i.e., on a supramolecular level scale of 1 nm and larger). In a more complete interpretation, texture includes morphology of porous space and the skeleton of a condensed (solid or sometimes liquid) phase, the shape, size, interconnectivity, and distribution of individual supramolecular elements of the system particles and pores (or voids) between particles, various phases, etc. In turn, texturology also involves general laws of texture formation and methods for its characterization [3],... [Pg.258]


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See also in sourсe #XX -- [ Pg.15 ]




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