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Gas phase oxidation of iso-butylene over bismuth molybdate based catalysts / Farid Benyahia 

Public ISBD Titre : Gas phase oxidation of iso-butylene over bismuth molybdate based catalysts Type de document : texte imprimé Auteurs : Farid Benyahia, Auteur ; A. M. Mearns, Directeur de thèse Editeur : Newcastle [England] : [s.n.] Année de publication : 1985 Importance : 161 f. Présentation : ill. Format : 30 cm. Note générale : Master thesis : Chemical Engineering : University of Newcastle Upon Tyne : 1985 Annexe f. 162 - 209 Langues : Anglais (eng) Mots-clés : Gas  phase  oxidation Isobutylene Silica  supported Tubular  flow  reactor On-line  gas  chromatography Surface  area  measurements X-ray  diffraction Index. décimale : Ms00385 Résumé : The selective vapour phase oxidation of hydrocarbons is an important method of synthesising valuable industrial organic intermediates destined to the manufacture of plastics, resins, lacquers and preservatives. Mixed oxides of transition metals have found wide application as catalysts in this respect. In recent years, thorough investigations of mechanistic and kinetic aspects of oxidation and ammoxidation processes have led to a greater understanding of how the above mentioned catalysts function. Beacause the oxidation and ammoxidation of propylene found commercial applications, the attention of research workers has been particularly focused on the catalytic oxidation and ammoxidation of that hydrocarbon on metal oxides, in particular on bismuth molybdate based catalysts. Bismuth molybdate based catalysts are known to be used in major commercial processes for the production of acrolein and acrylonitrile. In the present work, the kinetics of the gas phase oxidation of isobutylene over ϒ-bismuth molybdate (Bi₂O₃.MoO₃), multicomponent molybdate (Ni₈Cr₃BiMo₁₂On) and silica supported ϒ-bismuth molybdate were investigated in a differential tubular flow reactor over the temperature range (608-730 K) at a pressure of 101.33 kN m⁻² (1 atm) and the products were analysed by on-line gas chromatography. The catalysts employed were prepared by the co-precipitation and evaporation method and were characterised by suface area measurements and powder X-ray diffraction. Methacrolein and carbon dioxide were the sole products detected on the three types of catalysts, although traces of carbon monoxide were observed at low temperatures. All of the three types of catalysts were active and selective, however, the multicomponent molybdate was found to have the highest activity at temperatures in excess of 663 K. The supported bismuth molybdate was the best choice for reaction control as the carrier helped dissipate the heat of reaction. Gas phase oxidation of iso-butylene over bismuth molybdate based catalysts [texte imprimé] / Farid Benyahia, Auteur ; A. M. Mearns, Directeur de thèse . - Newcastle (England) : [s.n.], 1985 . - 161 f. : ill. ; 30 cm. Master thesis : Chemical Engineering : University of Newcastle Upon Tyne : 1985 Annexe f. 162 - 209 Langues : Anglais (eng) Mots-clés : Gas  phase  oxidation Isobutylene Silica  supported Tubular  flow  reactor On-line  gas  chromatography Surface  area  measurements X-ray  diffraction Index. décimale : Ms00385 Résumé : The selective vapour phase oxidation of hydrocarbons is an important method of synthesising valuable industrial organic intermediates destined to the manufacture of plastics, resins, lacquers and preservatives. Mixed oxides of transition metals have found wide application as catalysts in this respect. In recent years, thorough investigations of mechanistic and kinetic aspects of oxidation and ammoxidation processes have led to a greater understanding of how the above mentioned catalysts function. Beacause the oxidation and ammoxidation of propylene found commercial applications, the attention of research workers has been particularly focused on the catalytic oxidation and ammoxidation of that hydrocarbon on metal oxides, in particular on bismuth molybdate based catalysts. Bismuth molybdate based catalysts are known to be used in major commercial processes for the production of acrolein and acrylonitrile. In the present work, the kinetics of the gas phase oxidation of isobutylene over ϒ-bismuth molybdate (Bi₂O₃.MoO₃), multicomponent molybdate (Ni₈Cr₃BiMo₁₂On) and silica supported ϒ-bismuth molybdate were investigated in a differential tubular flow reactor over the temperature range (608-730 K) at a pressure of 101.33 kN m⁻² (1 atm) and the products were analysed by on-line gas chromatography. The catalysts employed were prepared by the co-precipitation and evaporation method and were characterised by suface area measurements and powder X-ray diffraction. Methacrolein and carbon dioxide were the sole products detected on the three types of catalysts, although traces of carbon monoxide were observed at low temperatures. All of the three types of catalysts were active and selective, however, the multicomponent molybdate was found to have the highest activity at temperatures in excess of 663 K. The supported bismuth molybdate was the best choice for reaction control as the carrier helped dissipate the heat of reaction.

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité	Spécialité	Etat_Exemplaire
Ms00385	Ms00385	Papier	Bibliothèque centrale	Mémoire de Master	Disponible		Consultation sur place

Documents numériques

BENYAHIA.Farid.pdf URL

A study of thermally evaporated cadmium sulphide layers on III/V compound semiconductors for photovoltaic devices / Himrane, Ferhat

Public ISBD Titre : A study of thermally evaporated cadmium sulphide layers on III/V compound semiconductors for photovoltaic devices Type de document : texte imprimé Auteurs : Himrane, Ferhat, Auteur ; R. Hill, Directeur de thèse Editeur : Newcastle [England] : [s.n.] Année de publication : 1986 Importance : 301 f. Présentation : ill. Format : 30 cm Note générale : PhD Thesis : Physics : Newcastle, School physics faculty of engineering : 1986 Bibliogr. en fin de chapitre Langues : Anglais (eng) Mots-clés : Thermally Evaporated  cadmium Sulphide  layers Photovoltaic  devices Index. décimale : D004286 Résumé : This work involved research on cadmium sulphide thin films prepared by the thermal evaporation technique and the fabrication and characterisation of cadmium sulphide/indium phosphide and cadmium sulphide/gallium arsenide solar cells. The first step was a review of solar cells with special focus on heterojunction cells using cadmium sulphide as optical window layer. The absorber, optical window layer and heterojunction requirements were reviewed and summarised. A study of thermally evaporated cadmium sulphide layers on III/V compound semiconductors for photovoltaic devices [texte imprimé] / Himrane, Ferhat, Auteur ; R. Hill, Directeur de thèse . - Newcastle (England) : [s.n.], 1986 . - 301 f. : ill. ; 30 cm. PhD Thesis : Physics : Newcastle, School physics faculty of engineering : 1986 Bibliogr. en fin de chapitre Langues : Anglais (eng) Mots-clés : Thermally Evaporated  cadmium Sulphide  layers Photovoltaic  devices Index. décimale : D004286 Résumé : This work involved research on cadmium sulphide thin films prepared by the thermal evaporation technique and the fabrication and characterisation of cadmium sulphide/indium phosphide and cadmium sulphide/gallium arsenide solar cells. The first step was a review of solar cells with special focus on heterojunction cells using cadmium sulphide as optical window layer. The absorber, optical window layer and heterojunction requirements were reviewed and summarised.

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité	Spécialité	Etat_Exemplaire
D004286	D004286	Papier	Bibliothèque centrale	Thèse de Doctorat	Disponible

Biodegradability of landfill leachate and economics of methane recovery / Ahmed Touahri

Public ISBD Titre : Biodegradability of landfill leachate and economics of methane recovery Type de document : texte imprimé Auteurs : Ahmed Touahri, Auteur ; G.K. Anderson, Directeur de thèse Editeur : Newcastle [England] : [s.n.] Année de publication : 1984 Importance : 116 f. Présentation : ill. Format : 29 cm. Note générale : Master of science : Civil engineering : University of Newcastle Upon Tyne : 1984 Bibliogr. f. 109 - 116 Langues : Anglais (eng) Mots-clés : Biodegradability Leachate Economics Methane  recovery Index. décimale : Ms01485 Résumé : First it is important to understand what takes place within a landfill after filling operations have been completed. Solid wastes placed in a sanitary landfill undergo a number of simultaneous biological, physical and chemical changes. Among the more important of these changes are the following Biodegradability of landfill leachate and economics of methane recovery [texte imprimé] / Ahmed Touahri, Auteur ; G.K. Anderson, Directeur de thèse . - Newcastle (England) : [s.n.], 1984 . - 116 f. : ill. ; 29 cm. Master of science : Civil engineering : University of Newcastle Upon Tyne : 1984 Bibliogr. f. 109 - 116 Langues : Anglais (eng) Mots-clés : Biodegradability Leachate Economics Methane  recovery Index. décimale : Ms01485 Résumé : First it is important to understand what takes place within a landfill after filling operations have been completed. Solid wastes placed in a sanitary landfill undergo a number of simultaneous biological, physical and chemical changes. Among the more important of these changes are the following

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité	Spécialité	Etat_Exemplaire
Ms01485	Ms01485	Papier	Bibliothèque centrale	Mémoire de Master	Disponible