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Dergi Makalesi
Dergi Makalesi
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Yıl:
2006
Peer review policy on journal of molecular catalysis A : chemical
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Tartışma
Tartışma
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Yazar(lar):
Yıl:
2006
Comment on paper entitled: “Silica Sulfate as a recyclable and efficient catalyst for Beckmann rearrangement under microwave irradiation” Journal of Molecular,Catalysis A: Chemical 250 (2006) 100–103
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Dergi Makalesi
Dergi Makalesi
Kaynak:
Yazar(lar):
Yıl:
2003
Erratum to “Encapsulation, characterization and catalytic properties of uranyl ions in mesoporous molecular sieves” Journal of Molecular Catalysis A 181
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yazar(lar):
Yıl:
1999
Analysis of cooperative catalysis by a molecular water oxidation catalyst adsorbed onto an inorganic particle matrix Electrocatalytic water oxidation was carried out using a basal-plane pyrolytic graphite (BPG) electrode coated with electrodeposited Platinum black (Pt-black The plots of VO2 vs. the complex amount on the Pt-black gave a sigmoidal curve, which was explained by both the cooperative catalysis by two molecules The electrocatalytic activity of the complex was analyzed in terms of its intrinsic activity, k (h−1), cooperative catalysis distance, rco (nm) and critical
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yazar(lar):
Yıl:
1997
New directions of catalysis research1 A variety of surface science technologies have been applied on catalysis studies, in an effort to understand surface structure, composition and chemical bonding in catalytic reactions at a molecular level. In order to obtain a better comprehension of industrial catalysts, model supported catalysts with ordered structures should be introduced into catalysis Chemical bonding
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yazar(lar):
Yıl:
2001
A molecular mechanism for Fischer–Tropsch catalysis Thus, hydrogen cyanide became an in situ model compound illuminating a C1 molecular insertion mechanism. This mechanism accounted for all products. Linear hydrocarbons formed from CO/H2 while branched hydrocarbons formed from a mixture of acetylene plus CO/H2 demonstrating the initial C1 species associated Catalysis Molecular mechanism
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yazar(lar):
Yıl:
1996
Computational-chemical advances in heterogeneous catalysis A short overview is presented of current status of computational chemistry with respect to issues in heterogeneous catalysis. Applications to transition-metal- and solid-acid catalysis will be discussed.
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yazar(lar):
Yıl:
1999
A new aspect of catalysis at designed surfaces: the role of gas phase molecules in surface catalytic reactions This paper attempts to extend our previous studies on the chemical design and characterization of attached metal atoms at surfaces of a Nb/SiO2 catalysts prepared by using a suitable metal-complex precursor and the elucidation of catalytic reaction mechanisms in a molecular scale. The paper also reports a new aspect of catalysis on a Co/Al2O3 catalyst which includes surface catalytic reactions assisted by gas phase molecules undetectable
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yazar(lar):
Yıl:
1997
Heterogeneous molecular catalysis: Oxymoron or reality? It has become common to call a molecular catalyst a single site catalyst. The intent is to stress that all sites of a molecular catalyst are identical in activity and selectivity. In this essay, three cases are examined. In each one the evidence is very strong that heterogeneous catalysts can be considered to be molecular catalysts. Heterogeneous catalysis
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yazar(lar):
Yıl:
1999
Bulk and fine chemicals via aqueous biphasic catalysis Homogeneous aqueous biphasic catalysis becomes more and more attractive for both bulk and fine chemical manufacture. Aqueous biphasic catalysis
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yazar(lar):
Yıl:
2009
Confinement in molecular sieves: The pioneering physical concepts Derouane expanded over numerous directions in zeolite chemistry, from the development of pioneering physical concepts to the optimization of chemical synthesis , including catalysis. D.P.V. is particularly indebted to Eric's long term vision regarding the multiple aspects to tackle using molecular simulations of sieves in general.
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yazar(lar):
Yıl:
2004
Biphasic Wacker-oxidation of a series of linear alkenes (from hexene-1 up to dodecene-1) and styrenes catalysed by water soluble calixarene-based systems calixarenes modified by the benzonitrile groups are shown to exhibit higher activity as compared to the same for similar catalytic systems containing a palladium salt and a water soluble calixarene. Biphasic catalysis Supramolecular catalysis Molecular recognition
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yazar(lar):
Yıl:
2003
Unified explanation of catalyzed and non-catalyzed chemical reactions a solid surface, neither physical nor chemical adsorption. Combining the hyperbolas, one from each reactant provides a quantitative interpretation of catalysis by specifying the catalytic metal, its numerical oxidation site for catalysis.
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yazar(lar):
Yıl:
2002
The transition state shape-selective aromatic alkylation over MnAPO-11 molecular sieve catalysts MnAPO-11 molecular sieves with medium size elliptical pore are synthesized and characterized. Transition state shape-selective catalysis of these molecular sieves are studied. Methylation of alkylaromatic compounds were efficiently catalyzed by these molecular sieves while aromatic ethylation was almost negligible. MnAPO-11 molecular sieves
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yazar(lar):
Yıl:
2002
Biphasic catalysis Supramolecular catalysis Molecular recognition
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yazar(lar):
Yıl:
1998
Molecular imprinting of polymerised catalytic complexes in asymmetric catalysis In homogenous catalysis, acetophenone was quantitatively converted to (R) phenyl ethanol 3 in 7 days, (67% ee) using two equivalent of (1S,2S)-N,N′-dimethyl Using the (S,S) isomer of the diamine leads to the reduction of propiophenone into (R) in 6 days with 47% ee In order to use molecular imprinting effect obvious for molecule related in structure to the template (propiophenone, 4′-trifluoromethyl acetophenone) and it is not efficient if the substrate has a Asymmetric catalysis Molecular imprinting
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yazar(lar):
Yıl:
1999
Kinetic dependence of the rate on the initial concentration of [Rh] and stoichiometric reactions of Rh-complexes with triethoxysilane and 1-hexene allow a steps, in particular reductive elimination of disiloxane (EtO)3SiOSiMe3 which generates hydridorhodium(I) complex suggested as an intermediate for the catalysis Molecular catalysis
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yazar(lar):
Yıl:
2000
New water-soluble palladium complexes with molecular recognition abilities based on β-cyclodextrin (β-CD) modified by nitrile-containing groups have been Biphasic catalysis Molecular recognition Supramolecular catalysis
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yazar(lar):
Yıl:
2001
Halogenation of terminal acetylenes by perhalogenoalkanes under phase transfer catalysis conditions Halogenation of terminal acetylenes by perhalogenoalkanes such as CCl4, CBr4 and CI4 under phase transfer catalysis conditions was studied. The quantum chemical calculations of bromination of 2-pyridylacetylene using the semiempirical AM1 method were carried out. Phase transfer catalysis
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yazar(lar):
Yıl:
2016
Green chemistry, catalysis and valorization of waste biomass This review focuses on the pivotal role of catalysis, both chemical and biological, in the development of sustainable technologies for the conversion of waste biomass to fuels, commodity chemicals and bio-based materials, such as bio-plastics, in a so-called bio-based, circular economy.
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yazar(lar):
Yıl:
2000
A new concept for the application of linear free energy relationships in catalysis Linear free energy relationships (LFERs) have been used in heterogeneous catalysis for a long time. Laidler, Chemical Kinetics, Harper Collins Publishers, New York, 1987, pp. 246–251.]. This work deals with the idea of validating a new concept for the application of LFER in heterogeneous catalysis.
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yazar(lar):
Yıl:
2009
A DFT study of the electronic structure of cobalt and nickel mono-substituted MoS2 triangular nanosized clusters Molybdenum disulfide nanoparticles are of interest for their extensive use in heterogeneous catalysis. On the basis of the electronic structure, the charge distribution and the Δ(ELUMO − EHOMO) gap analysis, the triangle molecular model with nickel substitution Charge distribution analysis points out a chemical reduction on the molybdenum sites when the cluster is doped.
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Başyazılar
Başyazılar
Kaynak:
Yazar(lar):
Yıl:
2017
Preface to Special Issue: C–H functionalization in modern molecular catalysis
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Araştırma Makalesi
Araştırma Makalesi
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Yazar(lar):
Yıl:
1996
The flexible surface: new techniques for molecular level studies of time dependent changes in metal surface structure and adsorbate structure during catalytic Many of the unique chemical properties of the surface can be associated with its ability to restructure rapidly as adsorbate bonds form or break. The investigations provide definitive evidence for physisorbed intermediates, stagnant chemisorbed species, and an unreconstructed surface during catalysis A detailed molecular mechanism for these two reactions can be proposed.
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yazar(lar):
Yıl:
1996
concepts of molecular chemistry which can be applied to mechanisms of heterogeneous catalysis. The similarity of the ‘supramolecular’ surface chemistry to molecular chemistry was limited since the surface hydroxyl groups of silica were found to participate A hydroxyl group in the coordination sphere of rhodium is a source of electrophilic protons, and neighbouring hydroxyl groups facilitate surface mobility
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yazar(lar):
Yıl:
2001
A brief outline of the historical development of heterogeneous catalysis as applied to the Heck reaction is given (Section 2). Heterogeneous catalysts supported over different kinds of supports (carbon, inorganic oxides, molecular sieves, polymeric materials, etc.) are reviewed Particular attention is paid to the metal leaching and the nature of catalysis, two tightly connected problems which appear to be still controversial ( electron spectroscopy for chemical analysis
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yıl:
1997
Chemical activities of graphitic carbon spheres Monodispersive carbon spheres with a high percentage of purity have been synthesized using a mixed-valent oxide-catalytic carbonization (MVOCC) process In this paper, the chemical activities of the carbon spheres are examined by dispersing Pt, CdS and WO3 nanoparticles, respectively, on the carbon surfaces The spheres are composed of graphitic flakes with high density open edges at the surfaces, thus, they are a good candidate for catalysis applications.
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yazar(lar):
Yıl:
2000
A kinetic study of the joint homogeneous–heterogeneous catalysis for the quaternization of silver (I)-coordinated triethylamine and tributilamine by ethyl The data obtained substantiated the superficial molecular arrangement, previously proposed by Barbosa and Spiro, and exposed a new competitive reaction Estimates of the solution rate constants were obtained for both systems and evidence of a surface effect is also presented. Superficial molecular arrangement
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yazar(lar):
Yıl:
2001
Catalysis and polymer networks — the role of morphology and molecular accessibility Molecular accessibility
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Araştırma Makalesi
Araştırma Makalesi
Kaynak:
Yazar(lar):
Yıl:
2004
Molecular building block approaches to chiral porous zirconium phosphonates for asymmetric catalysis Porous zirconium phosphonates containing chiral dihydroxy functionalities have been synthesized via a building block approach. This work represents a novel approach towards heterogeneous asymmetric catalysis. The tunability of such a molecular building block approach promises to lead to practically useful heterogeneous asymmetric catalytic processes. Molecular building block Asymmetric catalysis