tailoring reaction enthalpies of hydrogen storage materials
Báo cáo nghiên cứu khoa học: " EXPERIMENTAL AND THEORETICAL ANALYSIS OF A CRITICAL CHEMICAL REACTION: DECOMPOSITION OF HYDROGEN PEROXIDE (H2O2)" potx
... important heat & fluxes here are the heat flux of the reaction, Q reaction, and the heat flux of cooling, & Q cooling They are defined as: & Qreaction = ΔH reaction rVr (10) & Qcooling = UA(Tr − T ... optimization of the kinetic parameters of reaction The error function to be optimized is given by equation (13): OF = • M • (Q exp i − Q reaction ) ∑ i M − i =1 (13) The concentration profile inside ... The influences of hydrogen peroxide and catalyst concentration and of the initial temperature of the reactor on the reaction rate and the heat flow behavior were evaluated The hydrogen peroxide...
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The synthesis and application of energy storage materials derived from small molecules
... AND APPLICATION OF ENERGY STORAGE MATERIALS DERIVED FROM SMALL MOLECULES ZOU SHIQIANG (M.Sc, Peking University) A THESIS SUBMITTED FOR THE DEGREE OF MASTER OF SCIENCE DEPARTMENT OF CHEMISTRY NATIONAL ... schematic of the main chemical reaction in PTCB 12 synthesis Fig 2.3 The experiment scheme of chapter 13 Fig 2.4 TGA result of TCB 15 Fig 2.5 TGA result of PTCB 15 Fig 2.6 FTIR spectrum of TCB and ... study 47 IX List of Figures FIGURES Fig 1.1 PAGE Illustration of the charge/discharge processes in rechargeable Li-ion battery Fig 1.2 The redox mechanisms of three types of organic materials Fig...
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Numerical simulation and performance test of metal hydride hydrogen storage system
... conducted under the condition of 12 atm and room temperature After two hours absorption, the amount of hydrogen storage is 200 Nl under the condition of atm The hydrogen storage gravimetric capacity ... directing hydrogen can increase the penetration depth of hydride reaction and decrease the hydrogen absorption time Nomenclature Permeability of porous medium K Molecular weight M mass of hydrogen ... overview of hydrogen storage alloys from a gas reaction point of view”, J Alloys Compd 1999, 293-295, 877-888 [2] J Kapischke, J Hapke, “Measurement of the effective thermal conductivity of a Mg-MgH2...
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Development of high hydrogen capacity complex and chemical hydrides for hydrogen storage
... Table of Contents Acknowledgements I Table of Contents III Summary VIII List of Tables XI List of Figures XIII List of Schemes Chapter XXII Introduction 1.1 DOE target for hydrogen storage 1.2 Materials ... either of them as hydrogen storage system.4, Not surprisingly, the state -of- the-art hydrogen storage tank can store up to 700 bar H2.6 Besides compressed H2, storing hydrogen in liquid form offers ... flow rate 1.2 Materials for hydrogen storage Today’s available hydrogen storage technologies can be classified into two major categories, conventional and solid state hydrogen storage systems...
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Exploration of new technologies for hydrogen storage
... merits make MOFs the ideal materials for hydrogen storage Hydrogen storage on MOFs was initially investigated by Yaghi and co-workers, who reported a high hydrogen uptake of 4.5 wt % on MOF-5 at 77 ... portable hydrogen generators 2.6 Hydrogenation/Dehydrogenation of Liquid Hydrogen Carriers Hydrocarbons are hydrogen- rich compounds Some hydrocarbons can undergo hydrogenation/dehydrogenation reactions ... large quantity of hydrogen since the adsorption bonding enthalpies of hydrogen molecules are too weak to retain hydrogen Comparative research on the dependence of storage capacities of different absorbents...
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Encapsulation of phase change materials for heat storage
... energy storage 2.2 Thermal energy storage techniques 2.3 Candidate heat storage materials 15 2.4 Factors affecting the energy storage capacity of PCM 20 2.5 Encapsulation of phase change materials ... challenging techniques of thermal energy storage and the advantages and disadvantages of each storage techniques are presented Moreover, the study of heat storage materials, encapsulation of PCMs and encapsulation ... x LIST OF TABLES Table 2.1: Comparison of various heat storage media 13 Table 2.2: Physical properties of some PCMs 16 Table 2.3: Comparison of organic and inorganic materials for heat storage...
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Decolorization of Dye with Iron Oxide Catalysed Decomposition of Hydrogen Peroxide
... experimental condition (FeOOH reactions and tert-butanol reaction) Dye removal (reaction 6) is competitive reaction with reaction & CONCLUSION The removal of dye (Reactive Red 6) in hydrogen peroxide/iron ... the reaction rate of H2O2 with hydroxyl radical is relatively slow (k= 2.7x107 M-1s-1, Buxton et al (1988)) The relative difference of the respective rate constant of reaction make a decision of ... different effect of tert-butanol on hydrogen peroxide decomposition and dye removal The presence of tert-butanol caused only slight change of hydrogen peroxide decomposition, whereas 10 mM of tert-butanol...
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Characteristics of hydrogen production from food waste and waste activated sludge
... Clostridium sp can produce moles of hydrogen with mole of n-butyrate or moles of hydrogen with mole of acetate from mole of hexose In most cases using soluble defined substrates, hydrogen production yield ... hydrogen production potentials were in the range of 10-70 mL H2/g VS However, systematic studies of the anaerobic fermentation of solid wastes are still lacking, although hydrogen yield and hydrogen ... amounts of food waste and sewage sludge were added in individual bottles Each bottle was supplemented with 200 mg of KH2PO4, 14 mg of MgCl2•4H2O, mg of Na2MoO4•4H2O, mg of CaCl2•2H2O, 2.5 mg of MnCl2•6H2O,...
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Production of hydrogen using composite membrane in PEM water electrolysis
... produced hydrogen and oxygen gases are collected in respective vessels The yield of hydrogen is calculated by taking the volume of the vessel and length of the vessel and length of the hydrogen ... the molecular weight of hydrogen (g mol-1),F the faraday’s constant (96485 C mol-1) and Ne the number of electrons involved in the reaction The experimental yields of the hydrogen with composite ... performance of composite membrane in water electrolysis process for the production of hydrogen The characterization studies of the Composite membrane are done by ion exchange capacity (IEC) and FT-IR Materials...
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Tài liệu Báo cáo khoa học: Reaction mechanisms of thiamin diphosphate enzymes: redox reactions pdf
... the steady Redox reactions of thiamin diphosphate enzymes state of the overall reaction of PDHc by acid quench trapping [36] This finding is consistent with a stepwise mechanism of oxidation–reduction ... deprotonation of C2a-OH of HEThDP and protonation of FAD at N5 and N1) The tight and rigid binding of both cofactors excludes a direct carbanion mechanism with covalent linkage between C2a of the HEThDP ... addition of the second substrate CoA Quantitative analysis of substrate turnover revealed that two moles of final oneelectron acceptor ferredoxin are reduced per mole of pyruvate in the presence of...
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Tài liệu Báo cáo khoa học: Structural and mechanistic aspects of flavoproteins: probes of hydrogen tunnelling pptx
... theory of the kinetics of the coagulation of colloidal solutions Z Phys Chem 92, 129–168 Ansari A, Jones CM, Henry ER, Hofrichter J & Eaton WA (1992) The role of solvent viscosity in the dynamics of ... observation of a-2° KIEs values larger than the EIE was rationalized by Huskey & Schowen [36] because of coupling of the motion between the 2° hydrogen (labelled in Fig 1A) and the 1° (transferred) hydrogen ... reverse rate of this step (koff in Eqn 4) is comparable with the rate of H transfer, then kinetic isotope fractionation can occur, leading to the formation of more protiated than Hydrogen tunnelling...
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Tài liệu Báo cáo khoa học: nsights into the reaction mechanism of glycosyl hydrolase family 49 Site-directed mutagenesis and substrate preference of isopullulanase doc
... a-(1fi4)-linked glucose units of pullulan (Fig 4A) IPU is an anomer-inverting enzyme Comparison of the active sites of the model of IPU and Dex49A The active site structures of the model of IPU (Fig 4A) and ... composed of residues 25–540 The overall structure of the model of IPU and the mutated residues in this study are shown in Fig To elucidate the mechanism of the substrate recognition of IPU, two ... Prediction of the positions of amino acid residues whose substitutions resulted in the reduction of the IPU activity A B Fig Patterns of hydrolysis for pullulan (A) and panose (B) by W402F IPU Reaction...
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Tài liệu Báo cáo Y học: Insights into the reaction mechanism of Escherichia coli agmatinase by site-directed mutagenesis and molecular modelling ppt
... positions of other Fig Scheme of the binuclear manganese cluster and the localization of the side-chains of Asp153 and Asn153 in the modelled structures of wild-type and D153N mutant forms of E coli ... (Fig 5) Moreover, one of the carboxylate oxygens of Asp153 and the carboxamide oxygen of Asn153 are positioned in such a way as to allow metal coordination interaction with one of the manganese ions ... agmatinase, the whole hydrogen bond network was optimized The position of the active site manganese ions was calculated using the averaged distance template of 1CEV and 1RLA, and then a full hydrogen bond...
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Tài liệu Mesoscopic Model for Mechanical Characterization of Biological Protein Materials docx
... degree -of- fold, Q, is responsible for high yield stress of biological protein materials through breakage of hydrogen bond of β-sheet structural motif For deeper understanding the role of native ... better than that of Kevlar.6 This highlights that understanding of mechanical behavior of protein materials such as spider silk may provide the key concept for design of biomimetic materials, and ... role due to hydrogen bonding of βsheet structural motif This indicates that hydrogen bonding of β-sheet motif plays a significant role in mechanical properties of biological protein materials Moreover,...
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Báo cáo khoa học: Spectroscopic investigation of the reaction mechanism of CopB-B, the catalytic fragment from an archaeal thermophilic ATP-driven heavy metal transporter potx
... excess, offering an explanation of why the KM value of the ATPase reaction is relatively high compared with the lig fairly low equilibrium binding constant Kdiss of ATP Conclusions Partial reactions ... Hydrolytic mechanism of the catalytic CPx-ATPase domain Fig Investigation of the ATPase reaction by FTIR spectroscopy (A) Time course of ATP photo-release from cgATP The absorbance changes of the symmetric ... of IR difference spectra of nucleotides in the presence and absence of CopB-B leads to the conclusion that the phosphate groups of ATP apparently not contribute signicantly to the formation of...
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Báo cáo khoa học "ADIABATIC TEMPERATURE RISE AND REACTION RATE OF MASS STRUCTURE IN LOTTE CENTER HANOI PROJECT " pptx
... period layer of vinyl + layers of curing blanket + roof 20 days (a) Temperature analysis of the total cross section of mat foundation (b) Stress dispersion of the total cross section of mat foundation ... measured results (Center) Table The amount of adiabatic temperature rise and reaction velocity of the real member Class Temp of concrete placing Temp increased Reaction velocity Mock-up Test 32℃-35℃ ... TCI of the total cross section of mat foundation during and after curing Figure Full-Scale thermal stress and TCI of mat foundation Hydration history of mat foundation via actual construction of...
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Báo cáo khoa học: Production and utilization of hydrogen peroxide associated with melanogenesis and tyrosinase-mediated oxidations of DOPA and dopamine docx
... of reaction The rate of DOPA autoxidation was 0.8 pmÆmin)1 In reaction mixtures containing DOPA and tyrosinase, the rate of substrate oxidation 2409 Hydrogen peroxide in tyrosinase-mediated reactions ... Hydrogen peroxide in tyrosinase-mediated reactions M Mastore et al Fig Overview of the principal melanotic pathways and some of the proposed sites of activity of DOPA decarboxylase ... time, the production of H2O2 during tyrosinase-mediate oxidations of the DOPA and dopamine Comparative analyses of reaction rates 2411 Hydrogen peroxide in tyrosinase-mediated reactions M Mastore...
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The NINCH Guide to Good Practice in the Digital Representation and Management of Cultural Heritage Materials pptx
... percentage of salary cost • Software cost per item (both hardware and software costs should be on the basis of the depreciation of equipment or projected replacement cost, rather than the total cost of ... life-cycle management of digital resources Projects should plan for the life-cycle management of digital resources, including the initial assessment of resources, selection of materials and digital ... uses of material by multiple and diverse audiences Address the need for the preservation of original materials Projects should incorporate procedures to address the preservation of original materials...
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Báo cáo Y học: Kinetic and biochemical analyses on the reaction mechanism of a bacterial ATP-citrate lyase ppt
... Examination of the inhibitory effect of ADP As an increased ratio of ADP towards ATP signicantly inhibits Cl-ACL activity, we investigated the effect of ADP on the phosphorylation of AclA Addition of ... occurred in the absence of CoA Taking into account the reaction mechanism of mammalian ACL [23], the nal step of the reaction can be assumed to be the nucleophilic attack of CoA to the phosphorylated ... the reaction mixture The results are shown in Table The enzyme exhibited maximum activity in the presence of ATP, and in the presence of dATP showed 40% of this activity In the presence of CTP,...
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Effect of hydrogen peroxide on the destruction of organic contaminants synergism and inhibition in a con
... effect at higher concentrations A summary of the reaction rate constants of certain of these reactions is provided in Table Redox potentials of many of these reactions in homogeneous solutions and ... the ratio of H2 O2 molar extinction coefficient is 1960 Another pathway is the reaction of hydrogen peroxide with superoxide radical [31,37,38,49,52,60,61] In addition, the reaction of hydrogen ... concentration of hydrogen peroxide from zero to 100 mM They observed a slight enhancement of the degradation rate by 10% at hydrogen peroxide concentrations of 1–10 mM At 100 mM of hydrogen peroxide,...
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