L'@approche du mécanisme de formation d'une mésophase fluorophosphatée de titane a pu être établie à partir d'une stratégie en trois points : synthése et caractérisation de composés microporeux, élaboration d'oxydes et/ou phosphates mesoporeux et étude par RMN ( 1 9f and 3 1p) in situ de fluorophosphates de titane. L'étude des systèmes au titane a permis de démontrer l'existence de phases micro poreuses, en conditions hydrothermales, contenant du titane. Les informations cristallochimiques extraites ont permis d'accéder plus facilement à des composés me soporeux contenant du titane, En se dotant d'informations structurales qu'une étude ex nihilo des mesophases n'aurait pas permis. Ont été obtenus des oxydes, parfois phosphates, instables et conservant parfois une porosité me soporeuse résiduelle intéressante après calcination, ainsi qu'une mesophase fluorophosphatee hexagonale (phase h). L'étude RMN a permis d'apporter une contribution originale à la chimie des phosphates et fluorophosphates de titane en solution et d'extraire les grandes lignes des mécanismes de formation de phases micro et me soporeuses corrélées (mesophase h qui se transforme en tip micro poreux). dans les deux cas, Les espèces de prenucleation (pré nucléation building unit ou p.n.b.u.) participant à la formation du solide en conditions hydrothermales sont identiques. Ces résultats autorisent un bilan entre cristallochimie et espèces en solution pour la chimie des phosphates et des fluorophosphates de titane et une proposition de structure pour les p.n.b.u. intervenant lors de la formation des phases tip et h.

Reactive, but not a reactant. Heterogeneous catalysts play an unseen role in many of today's processes and products. With the increasing emphasis on sustainability in both products and processes, this handbook is the first to combine the hot topics of heterogeneous catalysis and clean technology. It focuses on the development of heterogeneous catalysts for use in clean chemical synthesis, dealing with how modern spectroscopic techniques can aid the design of catalysts for use in liquid phase reactions, their application in industrially important chemistries - including selective oxidation, hydrogenation, solid acid- and base-catalyzed processes - as well as the role of process intensification and use of renewable resources in improving the sustainability of chemical processes. With its emphasis on applications, this book is of high interest to those working in the industry.

Provides a concise yet comprehensive introduction to XPS and AES techniques in surface analysis This accessible second edition of the bestselling book, An Introduction to Surface Analysis by XPS and AES, 2nd Edition explores the basic principles and applications of X-ray Photoelectron Spectroscopy (XPS) and Auger Electron Spectroscopy (AES) techniques. It starts with an examination of the basic concepts of electron spectroscopy and electron spectrometer design, followed by a qualitative and quantitative interpretation of the electron spectrum. Chapters examine recent innovations in instrument design and key applications in metallurgy, biomaterials, and electronics. Practical and concise, it includes compositional depth profiling; multi-technique analysis; and everything about samples—including their handling, preparation, stability, and more. Topics discussed in more depth include peak fitting, energy loss background analysis, multi-technique analysis, and multi-technique profiling. The book finishes with chapters on applications of electron spectroscopy in materials science and the comparison of XPS and AES with other analytical techniques. Extensively revised and updated with new material on NAPXPS, twin anode monochromators, gas cluster ion sources, valence band spectra, hydrogen detection, and quantification Explores key spectroscopic techniques in surface analysis Provides descriptions of latest instruments and techniques Includes a detailed glossary of key surface analysis terms Features an extensive bibliography of key references and additional reading Uses a non-theoretical style to appeal to industrial surface analysis sectors An Introduction to Surface Analysis by XPS and AES, 2nd Edition is an excellent introductory text for undergraduates, first-year postgraduates, and industrial users of XPS and AES.

Bulletin de documentation, nos. 96-172, included in 1964-1970 volumes.