Browsing Τμήμα Χημείας / Department of Chemistry by Title
Now showing items 1203-1222 of 1299
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Article
Transformation of 2-(4-chloro-5H-1,2,3-dithiazol-5-ylideneamino)-6-ethoxy-4-phenylpyridine-3,5-dicarbonitrile into 4-aminopyrido[2,3-d]pyrimidines and 2-(pyrid-2-yl)guanidines
(2015)The reactions of 2-(4-chloro-5H-1,2,3-dithiazol-5-ylideneamino)-6-ethoxy-4-phenylpyridine-3,5-dicarbonitrile (14) with a range of primary and secondary amines are investigated. Treatment with n-BuNH2 and BnNH2 gave ...
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Article
Transient diffusion, desorption, and reaction studies of cyclopropane and propylene with NaX and Eu/NaX zeolites
(1992)The exchange of Eu3+ for Na+ cations into the sodalite cages of X zeolite (Eu25Na11X) leads selectively to the isomerization reaction of cyclopropane to propylene. The latter reaction is catalyzed by Brønsted acid sites ...
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Article
Transient diffusion, sorption, and desorption of cyclopropane in NaX zeolite
(1991)Transient diffusion, sorption, and desorption experiments of cyclopropane in Nax zeolite at 1 bar in a flow microreactor reveal that the nature of the diluent gas used in the sorbate mixture affects the kinetics of ...
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Article
Transient isotopic kinetic study of the NO/H2/O2 (lean de-NOx) reaction on Pt/SiO2 and Pt/La-Ce-Mn-O catalysts
(2004)Steady-state isotopic transient kinetic analysis (SSITKA) coupled with temperature-programmed surface reaction (TPSR) methods and using in situ mass spectroscopy and DRIFTS have been applied for the first time to study ...
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Article
A Transient Kinetic Study of the Co/H2 Reaction on Rh/Al2O3 Using FTIR and Mass Spectroscopy
(1994)The evolution of surface species (their chemical composition and surface coverage) formed during the CO/H2 reaction at 220°C on 1 wt% Rh/Al2O3 catalyst was studied by transient isotopic and various hydrogen titration ...
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Article
Transient kinetic study of the oxidation and hydrogenation of carbon species formed during CH4/He, CO2/He, and CH4/CO2 reactions over Rh/Al2O3 catalyst
(1996)The dissociation of CH4 and CO2 on 0.5 wt% Rh/Al2O3 catalyst has been investigated at 650°C using transient techniques with on-line mass spectrometry. The dissociation of CH4 results in the formation of large amounts of ...
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Article
Transient kinetic study of the reaction of C2H4 and C2H6 with the lattice and adsorbed oxygen species of Li+-doped TiO2 catalysts
(1994)A transient kinetic study of the reactions of C2H4 and C2H6 with lattice oxygen, O2- (in the absence of gaseous oxygen), and "adsorbed" oxygen (in the presence of gaseous oxygen) species over undoped and Li+-doped TiO2 OCM ...
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Article
Transient kinetic study of the reaction of CH4 and C2H6 with the lattice oxygen of Li+-doped TiO2 catalyst
(1993)A transient kinetic study of the reaction of CH4/He and C2H6/He with the lattice oxygen of Li+-doped TiO2 catalyst was performed. The results obtained indicate that lattice oxygen species must be considered as oxidation ...
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Article
Transient methods in heterogeneous catalysis: Experimental features and application to study mechanistic aspects of the CH4/O2 (OCM), NH3/O2 and NO/He reactions
(1997)Experimental features of the transient method using concentration forcing functions to study the surface dynamics of a heterogeneous catalytic reaction at 1 atm and with on line mass spectroscopy are discussed. Emphasis ...
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Article
Transient sorption and desorption studies of cyclopropane and propylene with Cs/NaX and Ni/NaX zeolites
(1992)Transient diffusion and sorption experiments of cyclopropane and propylene in Cs+and Ni2+ ion-exchanged Zeolites X in a flow microreactor reveal that the nature of the diluent gas affects the kinetics of intracrystalline ...
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Book Chapter
Transient Techniques: Temporal Analysis of Products and Steady State Isotopic Transient Kinetic Analysis
(Wiley-VCH, 2012)
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Conference Object
Transmission electron microscopy of steam activated viscose rayon chars
(Publ by Electrochemical Soc Inc, 1991)It was established that TEM could be employed to provide complementary data on the nature of the pores formed, in particular, their size, shape and distribution within the fibre cross-section. It was found that the borate ...
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Article
The trapped human experiment
(2011)This experiment observed the evolution of metabolite plumes from a human trapped in a simulation of a collapsed building. Ten participants took it in turns over five days to lie in a simulation of a collapsed building and ...
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Article
Triangular NiII2LnIII and Ni II2YIII complexes derived from di-2-pyridyl ketone: Synthesis, structures and magnetic properties
(2011)The synthetic investigation of the NiII/M(NO3) 3·6H2O/di-2-pyridyl ketone [(py)2CO] tertiary reaction system in EtOH has yielded triangular Ni2M cationic complexes (M = lanthanide, Y). The reaction between Ln(NO3) 3·6H2O, ...
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Article
Tricyclo[3.3.1.03,7]nonane-3,7-diyl bis(methanesulfonate)
(2010)The crystal structure of the title compound, C11H 18O6S2, was determined to investigate the effect of the eclipsed mesyl groups on the bond length of the vicinal quaternary C atoms. The two quaternary C atoms of the ...
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Article
Triggering selective uranium separation from aqueous solutions by using salophen-modified biochar fibers
(2018)Salophen modified biochar fibers derived from Luffa cylindrica sponges were prepared and subsequently studied as a potential U(VI) adsorbent by batch-type experiments. The material was characterized by spectroscopic and ...
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Article
Turbidimetric Titration Study of the Interaction of Proteins with Acrylic Polyampholytes
(1995)A study of the interaction of proteins [soybean trypsin inhibitor (0.3–1 mg/mL)] with dilute solutions of synthetic polyampholytes (0.05–0.4 mg/mL) composed of acrylic (or methacrylic) acid, (dimethylamino)ethyl methacrylate, ...
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Article
Two isomeric [Mn12O12(OMe)2(O 2CPh)16(H2O)2]2- single-molecule magnets and a MnIII polymer prepared by a reductive aggregation synthetic route
(2005)We describe a new synthetic procedure in Mn cluster chemistry involving reductive aggregation of permanganate (MnO4-) ions in MeOH/benzoic acid solution and the first two products that were obtained from this procedure. ...
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Article
Two ligand-binding sites in the O2-sensing signal transducer HemAT: Implications for ligand recognition/discrimination and signaling
(2006)We have identified a ligand (CO) accommodation cavity in the signal transducer sensor protein HemAT (heme-based aerotactic transducer) that allows us to gain single-molecule insights into the mechanism of gas sensor proteins. ...
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Article
Two new coordination polymers containing the triangular [Mn3O(O2CR)6]0/+ units
(2008)The preparation and crystal structures of two linear chain compounds of oxo-centered triangular Mn clusters are reported. {[Mn4O(O2CMe)8(py)] · 2MeCN}∞ (1 · 2MeCN)∞ was formed when a concentrated solution of [Mn3O(O2CMe)6(py)3] ...