Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Some Chemical and Structural Studies of Tin-molybdenum Oxide Catalysts
Author: Surface Structural Studies of Oxide Catalysts
Author: Richard Andrew MellorChemical and Structural Investigations of Some Mixed Oxide Catalysts
Author: Nuclear Science Abstracts
Author: Studies in Molybdenum Oxide Catalysts
Author: David Earl HuffmanPublisher:
ISBN:
Category : Molybdenum compounds
Languages : en
Pages : 334
Book Description
The cocondensation reactions of molybdenum trioxide vapor with tetraalkoxysilanes, trimethylalkoxysilanes, and hexamethyldisiloxane at -196°C were investigated. The products from the metal vapor reactions of tetramethoxysilane, tetraethoxysilane, and tetrapropoxysilane were characterized as molybdenum(VI)dioxodialkoxy compounds. The isolated compounds were found to be polymeric in the solid state by bridging through alkoxide groups. Metal vapor reaction of trimethylmethoxysilane gave an inseparable mixture of molybdenum(VI)alkoxysiloxy compounds which were also polymeric in nature. The metal vapor reactions of tetra-2-butoxysilane and trimethyl-t-butoxysilane gave butenes as a primary organic product and an uncharacterized blue molybdenum-containing solid. All products isolated in this study were sensitive to atmospheric moisture and light. The molybdenumdioxoalkoxy and molybdenumdioxoalkoxysiloxy compounds are good model compounds for the oxidation of alcohols. Decomposition studies of Mo(0)2(OMe)2 and Mo(0)2(OMe)x(OSiMe3)y yielded oxidation products of methanol, including dimethylether, formaldehyde, methyl formate, and dimethoxymethane. The reactivity of Mo(0)2(OEt)2 towards acidic protons was used to attach the molybdenum(VI)dioxo group to the surface of alumina (Al203), silica (Si02), titania (Ti02), zirconia (Zr02), and HY-zeolite. Chemical analysis and infrared spectroscopic studies indicate that dioxomolybdenum is attached to the support through bridging oxides between the support metal and molybdenum. The +2, +4, and +6 oxidation states of the surface attached molybdenum could be accessed by oxidation or reduction with 02 or H2, respectively. A survey of the catalytic nature for oxidation, metathesis, and Fischer- Tropsch synthesis of the supported molybdenum compounds in appropriate oxidation states was made. Dramatic differences in the activity and selectivity for oxidation of alcohols were observed depending on the support used. The Ti02 supported Mo(VI) showed the highest activity and selectivity for the oxidation of methanol to formaldehyde. The A1203 supported Mo(IV) system was the most active catalyst for propylene metathesis with the Si02 supported Mo(IV) system showing much less activity.
Index to Theses Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 398
Book Description
Synthetic and Structural Studies in Tin(II) Chemistry
Author: Alexander David ChristiePublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Tin and Its Uses
Author: Energy Research Abstracts
Author: Molecular Structure-reactivity Relationships for Supported Molybdenum Oxide Catalysts
Author: Hangchun HuPublisher:
ISBN:
Category : Catalysts
Languages : en
Pages : 444
Book Description