Oxidation of chlorinated alkanes over Co3O4/SBA-15 catalysts. Structural characterization and reaction mechanism

2016 ◽  
Vol 6 (14) ◽  
pp. 5618-5630 ◽  
Author(s):  
Jonatan Gonzalez-Prior ◽  
Jose Ignacio Gutierrez-Ortiz ◽  
Ruben Lopez-Fonseca ◽  
Guido Busca ◽  
Elisabetta Finocchio ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Structural Characterization ◽  
Chlorinated Hydrocarbons ◽  
Chlorinated Alkanes

This work presents novel results on the application of Co3O4/SBA-15 catalysts for the oxidation of chlorinated hydrocarbons.

Identification and structural characterization of a transient radical species in the uricase reaction mechanism

2007 ◽  
Vol 31 (3-4) ◽  
pp. 471-482 ◽  
Author(s):  
E. Busi ◽  
A. Sinicropi ◽  
L. Terzuoli ◽  
E. Marinello ◽  
R. Basosi
Keyword(s):  
Reaction Mechanism ◽  
Structural Characterization ◽  
Radical Species

Dehalogenation by Mycobacterium vaccae JOB-5: role of the propane monooxygenase

1994 ◽  
Vol 40 (3) ◽  
pp. 169-172 ◽  
Author(s):  
Laura A. Vanderberg ◽  
Jerome J. Perry
Keyword(s):  
Chlorinated Hydrocarbons ◽  
Short Chain ◽  
Mycobacterium Vaccae ◽  
Chlorinated Alkanes ◽  
Broad Specificity ◽  
Groundwater Pollutants

Mycobacterium vaccae JOB-5 has an inducible propane monooxygenase that has been implicated in the catabolism of most major groundwater pollutants including trichloroethylene. Propane-grown cells are also induced for the dehalogenation of 1-chlorobutane and other chloroalkanes. 1-Chlorobutane is oxidized to 2-butanol, indicating that subterminal oxidation of 1-chlorobutane resulted in a concomitant release of the chloride. Nonproliferating suspensions of M. vaccae induced for the propane monooxygenase can dehalogenate a variety of chlorinated hydrocarbons including monochlorinated alcohols, dichlorinated short chain alkanes, and several multiple-substituted compounds including trichloroethylene. The results indicate that M. vaccae JOB-5 has a monooxygenase of broad specificity that can dehalogenate an array of halogenated hydrocarbons.Key words: dehalogenation, propane monooxygenase, chlorinated alkanes.

Synthesis and Structural Characterization of Rigid Rod-Like Unsubstituted Quinoline Oligomers

1988 ◽  
Vol 134 ◽  
Author(s):  
Long Y. Chiang ◽  
Rodney V. Kastrup ◽  
Chang S. Hsu ◽  
John W. Swirczewski
Keyword(s):  
Molecular Weight ◽  
Reaction Mechanism ◽  
Structural Characterization ◽  
Spectroscopic Data ◽  
Bulk Material ◽  
Condensation Reaction ◽  
X Ray ◽  
Rigid Rod ◽  
Crystal Structural

ABSTRACTThe structure of quinoline oligomers synthesized by the catalytic dehydrogenative condensation reaction of 1,2,3,4-tetrahydroquinoline was elucidated on the basis of various spectroscopic data including the 2D COSY 1H NMR. The x-ray crystal structural study of two quinoline dimers successfully isolated from the bulk material resolved the puzzle of ring conjunction positions between quinoline units of the oligomer product. A reaction mechanism is proposed. From this mechanism a delicate balance between dehydrogenation and polymerization activity of the catalyst is required to optimize the yield and the molecular weight of the product.

Phase behavior of cationic and anionic surfactants at low concentrations

1992 ◽  
Vol 50 (1) ◽  
pp. 694-695
Author(s):  
E. Naranjo
Keyword(s):  
Phase Behavior ◽  
Structural Characterization ◽  
Dynamic Systems ◽  
Anionic Surfactants ◽  
Intermolecular Forces ◽  
Stable Form ◽  
Surfactant Mixtures ◽  
Low Concentrations ◽  
Cationic And Anionic Surfactants ◽  
General Method

Equilibrium vesicles, those which are the stable form of aggregation and form spontaneously on mixing surfactant with water, have never been demonstrated in single component bilayers and only rarely in lipid or surfactant mixtures. Designing a simple and general method for producing spontaneous and stable vesicles depends on a better understanding of the thermodynamics of aggregation, the interplay of intermolecular forces in surfactants, and an efficient way of doing structural characterization in dynamic systems.

New ultrastructural findings about Borrelia burgdorferi by cryofixation, negative staining, thin sectioning and scanning techniques

1990 ◽  
Vol 48 (3) ◽  
pp. 582-583
Author(s):  
S. F. Hayes ◽  
M. D. Corwin ◽  
T. G. Schwan ◽  
D. W. Dorward ◽  
W. Burgdorfer
Keyword(s):  
Lyme Disease ◽  
Borrelia Burgdorferi ◽  
Structural Characterization ◽  
Negative Staining ◽  
Low Speed ◽  
Thin Sectioning ◽  
Ultrastructural Findings

Characterization of Borrelia burgdorferi strains by means of negative staining EM has become an integral part of many studies related to the biology of the Lyme disease organism. However, relying solely upon negative staining to compare new isolates with prototype B31 or other borreliae is often unsatisfactory. To obtain more satisfactory results, we have relied upon a correlative approach encompassing a variety EM techniques, i.e., scanning for topographical features and cryotomy, negative staining and thin sectioning to provide a more complete structural characterization of B. burgdorferi.For characterization, isolates of B. burgdorferi were cultured in BSK II media from which they were removed by low speed centrifugation. The sedimented borrelia were carefully resuspended in stabilizing buffer so as to preserve their features for scanning and negative staining. Alternatively, others were prepared for conventional thin sectioning and for cryotomy using modified procedures. For thin sectioning, the fixative described by Ito, et al.

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