PREPARATION DE COMPOSES COMPLEXES MOLYBDENE-NICKEL-CUIVRE ET CHROME-NICKEL-CUIVRE. ETUDE DES PROPRIETES CATALYTIQUES DES SOLIDES ISSUS DE LEUR REDUCTION PDF Download
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Author: Abdellali El Khadiri
Publisher:
ISBN:
Category :
Languages : fr
Pages : 135
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DES COMPOSES NICKEL-CUIVRE-MOLYBDENE ET NICKEL-CUIVRE-CHROME ONT ETE PREPARES PAR REACTION EN SOLUTION CONCENTREE DE L'HEPTAMOLYBDATE D'AMMONIUM OU DU BICHROMATE D'AMMONIUM SUR LES COMPLEXES AMMONIACAUX DE NICKEL ET/OU DE CUIVRE. TOUS CES SOLIDES SONT ISOMORPHES DU TRIAMMINE TETRANICKEL PENTAMOLYBDATE D'AMMONIUM IDENTIFIE DANS UNE ETUDE ANTERIEURE. LES CATALYSEURS OBTENUS PAR REDUCTION DE CES COMPOSES PAR L'HYDROGENE A DES TEMPERATURES RELATIVEMENT BASSES (300#OC) ONT ETE ETUDIES DANS TROIS REACTIONS TESTS EN PHASE GAZEUSE: L'HYDROGENATION DU BENZENE, L'HYDROGENOLYSE DU N-BUTANE ET LA DECOMPOSITION DU PROPANOL-1 EN PRESENCE D'HYDROGENE. POUR LES CATALYSEURS A BASE DE MOLYBDENE, LE CUIVRE PROVOQUE UNE FORTE DECROISSANCE DE L'ACTIVITE SPECIFIQUE DANS CES REACTIONS D'HYDROGENATION OU D'HYDROGENOLYSE ALORS QUE SON EFFET EST MOINS IMPORTANT POUR LES CATALYSEURS A BASE DE CHROME. LA FORMATION DE PROPANE DANS LA REACTION DE DECOMPOSITION DU PROPANOL-1 ET CARACTERISTIQUE DE LA PRESENCE DU NICKEL. LES RESULTATS SONT INTERPRETES EN SUPPOSANT QUE LES REACTIONS D'HYDROGENATION OU D'HYDROGENOLYSE NECESSITENT DES ENSEMBLES D'ATOMES DE NICKEL ADJACENTS
Author: Abdellali El Khadiri
Publisher:
ISBN:
Category :
Languages : fr
Pages : 135
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Book Description
DES COMPOSES NICKEL-CUIVRE-MOLYBDENE ET NICKEL-CUIVRE-CHROME ONT ETE PREPARES PAR REACTION EN SOLUTION CONCENTREE DE L'HEPTAMOLYBDATE D'AMMONIUM OU DU BICHROMATE D'AMMONIUM SUR LES COMPLEXES AMMONIACAUX DE NICKEL ET/OU DE CUIVRE. TOUS CES SOLIDES SONT ISOMORPHES DU TRIAMMINE TETRANICKEL PENTAMOLYBDATE D'AMMONIUM IDENTIFIE DANS UNE ETUDE ANTERIEURE. LES CATALYSEURS OBTENUS PAR REDUCTION DE CES COMPOSES PAR L'HYDROGENE A DES TEMPERATURES RELATIVEMENT BASSES (300#OC) ONT ETE ETUDIES DANS TROIS REACTIONS TESTS EN PHASE GAZEUSE: L'HYDROGENATION DU BENZENE, L'HYDROGENOLYSE DU N-BUTANE ET LA DECOMPOSITION DU PROPANOL-1 EN PRESENCE D'HYDROGENE. POUR LES CATALYSEURS A BASE DE MOLYBDENE, LE CUIVRE PROVOQUE UNE FORTE DECROISSANCE DE L'ACTIVITE SPECIFIQUE DANS CES REACTIONS D'HYDROGENATION OU D'HYDROGENOLYSE ALORS QUE SON EFFET EST MOINS IMPORTANT POUR LES CATALYSEURS A BASE DE CHROME. LA FORMATION DE PROPANE DANS LA REACTION DE DECOMPOSITION DU PROPANOL-1 ET CARACTERISTIQUE DE LA PRESENCE DU NICKEL. LES RESULTATS SONT INTERPRETES EN SUPPOSANT QUE LES REACTIONS D'HYDROGENATION OU D'HYDROGENOLYSE NECESSITENT DES ENSEMBLES D'ATOMES DE NICKEL ADJACENTS
Author: Gabriel Dji
Publisher:
ISBN:
Category :
Languages : fr
Pages : 107
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Book Description
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 610
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Book Description
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: Stuart Hill
Publisher: Birkhäuser
ISBN: 3034863101
Category : Science
Languages : en
Pages : 364
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Book Description
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309170435
Category : Nature
Languages : en
Pages : 241
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Book Description
Having safe drinking water is important to all Americans. The Environmental Protection Agency's decision in the summer of 2001 to delay implementing a new, more stringent standard for the maximum allowable level for arsenic in drinking water generated a great deal of criticism and controversy. Ultimately at issue were newer data on arsenic beyond those that had been examined in a 1999 National Research Council report. EPA asked the National Research Council for an evaluation of the new data available. The committee's analyses and conclusions are presented in Arsenic in Drinking Water: 2001 Update. New epidemiological studies are critically evaluated, as are new experimental data that provide information on how and at what level arsenic in drinking water can lead to cancer. The report's findings are consistent with those of the 1999 report that found high risks of cancer at the previous federal standard of 50 parts per billion. In fact, the new report concludes that men and women who consume water containing 3 parts per billion of arsenic daily have about a 1 in 1,000 increased risk of developing bladder or lung cancer during their lifetime.
Author: P. L'Hermite
Publisher: Springer
ISBN: 9789027712943
Category : Science
Languages : en
Pages : 0
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Book Description
Proceedings of the Second European Symposium held in Vienna, Austria, 21-23 October, 1980
Author: International Atomic Energy Agency
Publisher:
ISBN:
Category : Business & Economics
Languages : en
Pages : 384
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Book Description
The purpose of this publication is to update and expand the first edition, which was published in 1983, and to report on later advances in uranium ore processing. It includes background information about the principles of the unit operations used in uranium ore processing and summarizes the current state of the art. Extensive references provide sources for specific technological details.
Author: Nasser Ennih
Publisher: Geological Society of London
ISBN: 9781862392519
Category : Science
Languages : en
Pages : 552
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Book Description
Author: Gerald G. Moy
Publisher: Springer
ISBN: 9781493939091
Category : Technology & Engineering
Languages : en
Pages : 0
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Book Description
Unless a food is grossly contaminated, consumers are unable to detect through sight or smell the presence of low levels of toxic chemicals in their foods. Furthermore, the toxic effects of exposure to low levels of chemicals are often manifested slowly, sometimes for decades, as in the case of cancer or organ failure. As a result, safeguarding food from such hazards requires the constant monitoring of the food supply using sophisticated laboratory analysis. While the food industry bears the primary responsibility for assuring the safety of its products, the overall protection of people’s diets from chemical hazards must be considered one of the most important public health functions of any government. Unfortunately, many countries do not have sufficient capability and capacity to monitor the exposure of their populations to many potentially toxic chemicals that could be present in food and drinking water. Without such monitoring, public health authorities in many countries are not able to identify and respond to problems posed by toxic chemicals, which may harm their population and undermine consumer confidence in the safety of the food supply. From a trade perspective, those countries that cannot demonstrate that the food they produce is free of potentially hazardous chemicals will be greatly disadvantaged or even subject to sanctions in the international marketplace. The goal of a total diet study (TDS) is to provide basic information on the levels and trends of exposure to chemicals in foods as consumed by the population. In other words, foods are processed and prepared as typical for a country before they are analyzed in order to better represent actual dietary intakes. Total diet studies have been used to assess the safe use of agricultural chemicals (e.g., pesticides, antibiotics), food additives (e.g., preservatives, sweetening agents), environmental contaminants (e.g., lead, mercury, arsenic, cadmium, PCBs, dioxins), processing contaminants (e.g., acrylamide, polycyclic aromatic hydrocarbons, chloropropanols), and natural contaminants (e.g., aflatoxin, patulin, other mycotoxins) by determining whether dietary exposure to these chemicals are within acceptable limits. Total diet studies can also be applied to certain nutrients where the goal is to assure intakes are not only below safe upper limits, but also above levels deemed necessary to maintain good health. International and national organizations, such as the World Health Organization, the European Food Safety Agency and the US Food and Drug Administration recognize the TDS approach as one of the most cost-effective means of protecting consumers from chemicals in food, for providing essential information for managing food safety, including food standards, and for setting priorities for further investment and study. Total Diet Studies introduces the TDS concept to a wider audience and presents the various steps in the planning and implementation of a TDS. It illustrates how TDSs are being used to protect public health from chemicals in the food supply in many developed and developing countries. The book also examines some of the applications of TDSs to specific chemicals, including contaminants and nutrients.
