Empirical and Analytical Correlation of the Reaction Kinetics Parameters of Cuttle Bone Powder Immobilized Lipase Catalyzed Ethyl Ferulate Synthesis

Biological network inference is based on a series of studies and computational approaches to the deduction of the connectivity of chemical species, the reaction pathway, and the reaction kinetics of complex reaction systems from experimental measurements. Inference for network structure and reaction kinetics parameters governing the dynamics of a biological system is currently an active area of research. In the era of post-genomic biology, it is a common opinion among scientists that living systems (cells, tissues, organs and organisms) can be understood in terms of their network structure as well as in term of the evolution in time of this network structure. In this chapter, the authors make a survey of the recent methodologies proposed for the structure inference and for the parameter estimation of a system of interacting biological entities. Furthermore, they present the recent works of the authors about model identification and calibration.

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A self-adjusting platinum surface for acetone hydrogenation

Proceedings of the National Academy of Sciences ◽

10.1073/pnas.1917110117 ◽

2020 ◽

Vol 117 (7) ◽

pp. 3446-3450 ◽

Cited By ~ 4

Author(s):

Benginur Demir ◽

Thomas Kropp ◽

Keishla R. Rivera-Dones ◽

Elise B. Gilcher ◽

George W. Huber ◽

...

Keyword(s):

Reaction Kinetics ◽

Density Functional ◽

Surface Coverage ◽

Binding Energies ◽

Microkinetic Modeling ◽

Reaction Conditions ◽

Platinum Surface ◽

Kinetics Parameters ◽

Supported Platinum Catalysts ◽

Wide Range

We show that platinum displays a self-adjusting surface that is active for the hydrogenation of acetone over a wide range of reaction conditions. Reaction kinetics measurements under steady-state and transient conditions at temperatures near 350 K, electronic structure calculations employing density-functional theory, and microkinetic modeling were employed to study this behavior over supported platinum catalysts. The importance of surface coverage effects was highlighted by evaluating the transient response of isopropanol formation following either removal of the reactant ketone from the feed, or its substitution with a similarly structured species. The extent to which adsorbed intermediates that lead to the formation of isopropanol were removed from the catalytic surface was observed to be higher following ketone substitution in comparison to its removal, indicating that surface species leading to isopropanol become more strongly adsorbed on the surface as the coverage decreases during the desorption experiment. This phenomenon occurs as a result of adsorbate–adsorbate repulsive interactions on the catalyst surface which adjust with respect to the reaction conditions. Reaction kinetics parameters obtained experimentally were in agreement with those predicted by microkinetic modeling when the binding energies, activation energies, and entropies of adsorbed species and transition states were expressed as a function of surface coverage of the most abundant surface intermediate (MASI, C3H6OH*). It is important that these effects of surface coverage be incorporated dynamically in the microkinetic model (e.g., using the Bragg–Williams approximation) to describe the experimental data over a wide range of acetone partial pressures.

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Thermal Reaction Kinetics of Fly Ash Cement Paste at the Age of 28 Days

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.668-669.91 ◽

2014 ◽

Vol 668-669 ◽

pp. 91-94 ◽

Cited By ~ 1

Author(s):

Xiao Fang He ◽

Chang Wen Miao ◽

Yong Hao Wu ◽

Xin Xin Cao ◽

Dan Liu

Keyword(s):

Activation Energy ◽

Fly Ash ◽

Apparent Activation Energy ◽

Reaction Kinetics ◽

Thermal Reaction ◽

Physical Parameters ◽

Scanning Calorimetry ◽

Kinetics Parameters ◽

Cement Pastes ◽

Kinetics Of

The thermal reaction kinetics of fly ash cement pastes were studied by Differential Scanning Calorimetry (DSC) and Thermal Gravity Analysis-Differential Thermal Gravity (TG-DTG) method, the kinetics parameters such as apparent activation energy was calculated by the Kissinger method, and the physical parameters were obtained. The result show that the fly ash cement pastes performance three endothermic reaction stages at different heating rates, peak temperatures of each stage at the range of 91.85~121.08°C, 453.93~496.48°C, and 680.21~751.62°C. TG-DTG show there were three thermal decomposition stages, thermal dehydration reaction apparent activation energy of fly ash cement pastes in each stage were 47.23kJ/mol, 128.84kJ/mol, and 134.07kJ/mol.

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KINETIKA FOTODEGRADASI METHYLENE BLUE MENGGUNAKAN KOMPOSIT Ag3PO4/Ag/HAp TULANG IKAN KAKAP MERAH (Lutjanus sp.)

CHEMISTRY PROGRESS ◽

10.35799/cp.12.2.2019.27930 ◽

2020 ◽

Vol 12 (2) ◽

Author(s):

Stoflly E. M. Pangajow ◽

Audy Wuntu ◽

Meiske S. Sangi

Keyword(s):

Methylene Blue ◽

Visible Light ◽

Reaction Kinetics ◽

Fish Bone ◽

Order Reaction ◽

Kinetics Model ◽

Light Radiation ◽

Second Order Reaction ◽

Bone Powder ◽

Kinetics Of

ABSTRAKTujuan dari penelitian ini untuk mengkaji kinetika fotodegradasi methylene blue (MB) menggunakan komposit Ag3PO4/Ag/HAp tulang ikan kakap merah (Lutjanus sp.). Serbuk tulang ikan yang dikalsinasi hingga 1000ºC dan direaksikan dengan AgNO3 dengan rasio mol 5:1 (Ag:HAp) dan dihasilkan komposit Ag3PO4/Ag/HAp. Larutan MB diinteraksikan dengan komposit dengan variasi waktu 5-180 menit dibawah radiasi cahaya tampak. Konsentrasi MB yang tersisa ditentukan ditentukan dengan spektrofotometer UV-Vis dan data yang diperoleh dianalisis dengan model kinetika reaksi orde ke-1 dan ke-2. Hasil penelitian menunjukkan bahwa fotodegradasi MB oleh komposit Ag3PO4/Ag/HAp mengikuti model kinetika fotodegradasi orde ke-2. ABSTRACT The purpose of this research was to study the kinetics of methylene blue (MB) photodegradation using composite Ag3PO4/Ag/HAp bone fish of red snapper (Lutjanus sp.). Fish bone powder which was calcined to 1000ºC and reacted with AgNO3 with mole ratio of 5 : 1 (Ag: HAp) and produced Ag3PO4/Ag/HAp composite. MB solution was interacted with composites with variation of time 5-180 minutes under visible light radiation. The remaining MB concentrations determined were determined by a UV-Vis spectrophotometer and the data obtained were analyzed with first and second order reaction kinetics model. The results showed that MB photodegradation by Ag3PO4/Ag/HAp composites followed the 2nd order photodegradation kinetics model.

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A coupled transport and solid mechanics formulation with improved reaction kinetics parameters for modeling oxidation and decomposition in a uranium hydride bed.

10.2172/1095935 ◽

2013 ◽

Cited By ~ 1

Author(s):

Maher Salloum ◽

Andrew Shugard ◽

Michael Kanouff ◽

Patricia Gharagozloo

Keyword(s):

Reaction Kinetics ◽

Solid Mechanics ◽

Coupled Transport ◽

Kinetics Parameters

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Numerical methods for reaction kinetics parameters: identification of low-temperature propane conversion in the presence of methane

Procedia Engineering ◽

10.1016/j.proeng.2017.09.654 ◽

2017 ◽

Vol 201 ◽

pp. 612-616 ◽

Cited By ~ 5

Author(s):

L.F. Akhmadullina ◽

L.V. Enikeeva ◽

I.M. Gubaydullin

Keyword(s):

Numerical Methods ◽

Low Temperature ◽

Reaction Kinetics ◽

Parameters Identification ◽

Propane Conversion ◽

Kinetics Parameters

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Enzymatic Production of Bio-Diesel from Waste Cooking Oil Using Lipase

The Open Chemical Engineering Journal ◽

10.2174/1874123100802010084 ◽

2008 ◽

Vol 2 (1) ◽

pp. 84-88 ◽

Cited By ~ 7

Author(s):

Sulaiman Al-Zuhair

Keyword(s):

Immobilized Lipase ◽

Sol Gel ◽

Waste Cooking Oil ◽

Molar Ratio ◽

Free Form ◽

Kinetics Parameters ◽

Enzymatic Production ◽

Cooking Oil ◽

Free Lipase

The applications of lipase immobilized on ceramic beads and entrapped in sol-gel matrix, in the production of bio-diesel from waste cooking oil, are compared to that of free lipase. Experimental determination of the effect of molar equivalent of methanol, to moles of ester bond in the triglyceride, on the rate of the enzymatic trans-esterification was experimentally determined. It was found that for the same weight of lipase used, the production of bio-diesel was much higher using lipase immobilized on ceramic beads in comparison to that using lipase entrapped in sol-gel and in free form. Substrates inhibition effect was observed in all cases, which agrees with previous results found in literature. The optimum methanol:oil molar ratio was found to be 0.87 for immobilized lipase from yeast source, C. antartica and 1.00 for free lipase from the same yeast source and immobilized lipase from bacterial source, P. cepacia. On the other hand, it was shown that biodieasel can be produced in considerable amounts, with yield reaching 40%, in absence of organic solvent using immobilized lipase, from P. cepacia, on ceramic beads. The results of this study can be used to determine the kinetics parameters of mathematical models which describe the system.

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