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Author: MURIEL.. CHEVAL
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Book Description
UN CATALYSEUR MASSIQUE EN POUDRE, W2C+W, A DES PROPRIETES CATALYTIQUES INTERESSANTES DANS LE REFORMAGE CATALYTIQUE DES HYDROCARBURES, COMPARATIVEMENT AU PLATINE. DANS LE CAS DU METHYLCYCLOPENTANE QUI EST LA MOLECULE TEST, IL Y A AGRANDISSEMENT DU CYCLE EN CYCLOHEXANE ET AROMATISATION EN BENZENE AVEC UNE SELECTIVITE AVOISINANT 50%, UNE DEMETHYLATION SELECTIVE, HYDROGENOLYSE DU CYCLE ET HYDROGENOLYSE EXTENSIVE, SELON UN MECANISME BIFONCTIONNEL. LA CORRELATION ENTRE LA REACTIVITE DU METHYLCYCLOPENTANE ET L'ETAT DE SURFACE DE W2C+W, DETERMINE PAR XPS, EST DELICATE DANS LA MESURE OU LE TUNGSTENE, LE CARBONE ET L'OXYGENE SONT PRESENTS, EN SURFACE, DANS DIFFERENTS ETATS CHIMIQUES. POUR PRECISER LE ROLE DE CHACUN DE CES ELEMENTS DANS LES PROPRIETES CATALYTIQUES DE W2C+W, UNE ETUDE DES PROPRIETES CATALYTIQUES DE SURFACES MODELES (TUNGSTENE: METAL, OXYDE (WO, WO3 + CARBONE AMORPHE), CARBURE (W2C)), PREPAREES A PARTIR D'UN RUBAN DE TUNGSTENE, A ETE REALISEE EN CORRELATION AVEC LEURS ETATS DE SURFACE DETERMINES PAR XPS OU AES. SUR LE METAL ET LE CARBURE, IL Y A UNIQUEMENT FORMATION DE METHANE ET D'ETHANE. SUR OXYDES, IL Y A DESHYDROGENATION DU METHYLCYCLOPENTANE EN METHYLCYCLOPENTENES, SELON UN MECANISME ACIDE. ON NE RETROUVE PAS LES PROPRIETES CATALYTIQUES DE W2C+W. L'OBTENTION D'UN MECANISME BIFONCTIONNEL NECESSITE DONC L'EXISTENCE, EN SURFACE, D'UNE PHASE METAL ET/OU CARBURE, ASSOCIEE A UNE PHASE OXYDE ET/OU OXYCARBURE (L'OXYCARBURE ETANT PROBABLEMENT FORME AU COURS DE L'ACTIVATION SOUS HYDROGENE DE W2C+W). L'EXISTENCE UNIQUEMENT D'UNE PHASE OXYCARBURE EN SURFACE EST AUSSI ENVISAGEABLE
Author: MURIEL.. CHEVAL
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Book Description
UN CATALYSEUR MASSIQUE EN POUDRE, W2C+W, A DES PROPRIETES CATALYTIQUES INTERESSANTES DANS LE REFORMAGE CATALYTIQUE DES HYDROCARBURES, COMPARATIVEMENT AU PLATINE. DANS LE CAS DU METHYLCYCLOPENTANE QUI EST LA MOLECULE TEST, IL Y A AGRANDISSEMENT DU CYCLE EN CYCLOHEXANE ET AROMATISATION EN BENZENE AVEC UNE SELECTIVITE AVOISINANT 50%, UNE DEMETHYLATION SELECTIVE, HYDROGENOLYSE DU CYCLE ET HYDROGENOLYSE EXTENSIVE, SELON UN MECANISME BIFONCTIONNEL. LA CORRELATION ENTRE LA REACTIVITE DU METHYLCYCLOPENTANE ET L'ETAT DE SURFACE DE W2C+W, DETERMINE PAR XPS, EST DELICATE DANS LA MESURE OU LE TUNGSTENE, LE CARBONE ET L'OXYGENE SONT PRESENTS, EN SURFACE, DANS DIFFERENTS ETATS CHIMIQUES. POUR PRECISER LE ROLE DE CHACUN DE CES ELEMENTS DANS LES PROPRIETES CATALYTIQUES DE W2C+W, UNE ETUDE DES PROPRIETES CATALYTIQUES DE SURFACES MODELES (TUNGSTENE: METAL, OXYDE (WO, WO3 + CARBONE AMORPHE), CARBURE (W2C)), PREPAREES A PARTIR D'UN RUBAN DE TUNGSTENE, A ETE REALISEE EN CORRELATION AVEC LEURS ETATS DE SURFACE DETERMINES PAR XPS OU AES. SUR LE METAL ET LE CARBURE, IL Y A UNIQUEMENT FORMATION DE METHANE ET D'ETHANE. SUR OXYDES, IL Y A DESHYDROGENATION DU METHYLCYCLOPENTANE EN METHYLCYCLOPENTENES, SELON UN MECANISME ACIDE. ON NE RETROUVE PAS LES PROPRIETES CATALYTIQUES DE W2C+W. L'OBTENTION D'UN MECANISME BIFONCTIONNEL NECESSITE DONC L'EXISTENCE, EN SURFACE, D'UNE PHASE METAL ET/OU CARBURE, ASSOCIEE A UNE PHASE OXYDE ET/OU OXYCARBURE (L'OXYCARBURE ETANT PROBABLEMENT FORME AU COURS DE L'ACTIVATION SOUS HYDROGENE DE W2C+W). L'EXISTENCE UNIQUEMENT D'UNE PHASE OXYCARBURE EN SURFACE EST AUSSI ENVISAGEABLE
Author: Iron and Steel Institute
Publisher:
ISBN:
Category : Iron industry and trade
Languages : en
Pages : 880
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Book Description
Includes sect. "A survey of literature on the manufacture and properties of iron and steel, and kindred subjects" (title varies)
Author: Th. Weber
Publisher: Springer Science & Business Media
ISBN: 9401735778
Category : Science
Languages : en
Pages : 357
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Book Description
Hydrotreating catalysis with transition metal sulphides is one of the most important areas of industrial heterogeneous catalysis. The present book deals with the chemical and catalytic aspects of transition metal sulphides, focusing on their use in hydrotreating catalysis. The book¿s 12 chapters present reviews of solid-state, coordination and organometallic chemistry, surface science and spectroscopic studies, quantum chemical calculations, catalytic studies with model and real catalysts, as well as refinery processes. A presentation of state-of-the-art background to pertinent work in the field. Can be used as an introduction to the chemical and catalytic properties of transition metal sulphides as well as an advanced level reference.
Author: Don Montague
Publisher: Taylor & Francis
ISBN: 9780419199106
Category : Architecture
Languages : en
Pages : 472
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Book Description
This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.
Author: European Economic Community
Publisher:
ISBN:
Category : Political Science
Languages : en
Pages : 356
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Author:
Publisher:
ISBN:
Category : Medicine
Languages : en
Pages : 1404
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Author: Marc Pansu
Publisher: Springer Science & Business Media
ISBN: 3540312110
Category : Science
Languages : en
Pages : 996
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Book Description
This handbook is a reference guide for selecting and carrying out numerous methods of soil analysis. It is written in accordance with analytical standards and quality control approaches. It covers a large body of technical information including protocols, tables, formulae, spectrum models, chromatograms and additional analytical diagrams. The approaches are diverse, from the simplest tests to the most sophisticated determination methods.
Author: CRAIG GRIMES
Publisher: Springer Science & Business Media
ISBN: 0387682384
Category : Technology & Engineering
Languages : en
Pages : 561
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Book Description
This book covers the field of solar production of hydrogen by water photo-splitting (photoelectrolysis) using semiconductor photoanodes. The emphasis of the discussion is on the use of nanotechnology in the field. The theories behind photocatalysis and photoelectrochemical processes responsible for hydrogen production are given in detail. This provides a state-of-the-art review of the semiconductor materials and methods used for improving the efficiency of the processes. The book also gives an account of the techniques used for making the nanostructures.
Author: Jacqueline Ki-Zerbo
Publisher: Univ of California Press
ISBN: 9780520066960
Category : History
Languages : en
Pages : 372
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Book Description
"This volume covers the period from the end of the Neolithic era to the beginning of the seventh century of our era. This lengthy period includes the civilization of Ancient Egypt, the history of Nubia, Ethiopia, North Africa and the Sahara, as well as of the other regions of the continent and its islands."--Publisher's description
Author: Vladimir I. Vernadsky
Publisher: Springer Science & Business Media
ISBN: 1461217504
Category : Science
Languages : en
Pages : 224
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Book Description
"Vladimir Vernadsky was a brilliant and prescient scholar-a true scientific visionary who saw the deep connections between life on Earth and the rest of the planet and understood the profound implications for life as a cosmic phenomenon." -DAVID H. GRINSPOON, AUTHOR OF VENUS REVEALED "The Biosphere should be required reading for all entry level students in earth and planetary sciences." -ERIC D. SCHNEIDER, AUTHOR OF INTO THE COOL: THE NEW THERMODYNAMICS OF CREATIVE DESTRUCTION
