glycothermal synthesis of mixed metal oxides

... activity of three-way catalysts based on mixed metal oxides for the treatment of exhaust gases from internal combustion engine EXPERIMENTAL 2.1 Synthesis of the catalysts 2.1.1 Sol-gel synthesis of mixed ... oxidation The most active single metal oxides for combustion of VOCs are the oxides of Cu, Co, Mn, and Ni Some typical oxides will be mentioned in more detail 1.3.3.1 Metallic oxides based on CeO2 As ... catalytic activity of three-way catalysts based on mixed metal oxides for the treatment of exhaust gases from internal combustion engine CONTENT OF THESIS LIST OF TABLES LIST OF FIGURES INTRODUCTION...

Ngày tải lên: 12/05/2014, 17:14

... diacetate (10) 40 4.7 Synthesis of Folate-NHS (11) 41 4.8 Synthesis of Folate-DOTA (13) 42 4.9 Synthesis of Folate-DO3tBu (12) 43 4.10 Synthesis of Mannich Salt (14) 46 4.11 Synthesis of Bis-disulfide ... Bis-disulfide (15) 47 4.12 Synthesis of Bis-sulfone (16) 48 4.13 Synthesis of Bromoethyl-bis-sulfide (18) 50 4.14 Synthesis of Piperazine-bis-sulfide (23) 52 4.15 Synthesis of Tert-butyl 4-(2-aminoethyl) ... department of NUS for giving me the opportunity to undertake this project i Table of Contents TABLE OF CONTENTS Acknowledgements i Table of Contents ii List of Figures v List of Schemes vi Index of Abbreviations...

Ngày tải lên: 16/10/2015, 11:57

... aquarium pump Method of Synthesis of metal oxides Fig Flow diagram of the synthsis process of Pd+CuO 92 Inorganic Nanomedicine: Synthesis, Characterization and Application Preparation of Pd (0)-water ... process as compared to the existing processes for the synthesis of metal oxides [21] Characterisation of bulk metal oxides Dry Pd-based metal oxides were characterized using SEM-EDX, XRD and DLS ... Pd-Cu-Ni-O etc The presence of sulphur and carbon in the metal oxides was avoided by using non-sulphur, non-carbon containing metal precursors The synthesis of Pd- based metal oxides by this sonochemical...

Ngày tải lên: 11/06/2014, 12:29

... reactivity of these substrates with mixed- metal clusters To date there have been no reports on the reactivity of osmium-iridium mixed- metal clusters with chalcogenides In continuation of our reactivity ... absence of TMNO It was also found that a 1:2.6:2.6 ratio of 3c: TMNO:Ph3PSe was required to ensure completion of reaction of 3c; reducing the ratio of TMNO or Ph3PSe resulted in recovery of large ... P(7)-Os(4)-Os(2) = 173.39(6)º The molecular structure of 26 consists of a spiked-triangular array of metal atoms The iridium spike does not lie in the plane of the Os3 triangle The two selenium atoms act...

Ngày tải lên: 16/09/2015, 08:30

... introduction to ligands and substrates As the focus of the research is on the synthesis and reactivity of mixed metal carbonyl clusters, a short review of some of the ligands like CO, hydrides, and cyclopentadienyls ... transition metals and chalcogen ligands have been argued to serve as useful models and precursors for the synthesis of new materials [39, 40] Figure 1.9 shows the cluster core structure of the mixed metal ... systems has created a resurgence of interest in the study of mixed metal clusters, in particular those of groups and For example, it has been shown that the carbonylation of methanol to give acetic...

Ngày tải lên: 16/09/2015, 08:32

... molecular structure of consists of a tetrahedral metal core, with six metal- metal bonds as expected from polyhedral skeletal electron pair theory (PSEPT) for a 60 electron metal cluster compound ... Reaction of Cp*Ir(CO)2 with Os3(CO)10(CH3CN)2 The mixed- metal cluster Cp*IrOs3(CO)11, has been isolated in 20% yield by the reaction of Os3(CO)10(CH3CN)2, 6, with Cp*Ir(CO)2, 2a The IR spectrum of ... fragmentation with the formation of Ru3(CO)12 and Cp*Ir(CO)2 indicating that the metal- metal bonds in these clusters are not very strong (Scheme 2.5) This type of break down of cluster skeleton was previously...

Ngày tải lên: 16/09/2015, 08:32

... disposed parallel to the “hinge” metal metal bond of the butterfly, and the alkyne interacts with all four metal atoms Wing tip metal atoms C π π M π C σ σ M' M π M Hinge metal atoms Figure 3.1 M3M’C2 ... some of the reactions of tetrahedral mixed metal clusters with alkynes It can be seen that most heterometallic tetrahedral clusters reacted with alkynes to afford butterfly clusters Most of these ... Reaction of 3a with MeCCBut Thermal reaction of 3a with 4, 4-dimethyl 2-pentyne afforded red crystals of 10c, with IR spectroscopic characteristics similar to those of 10a and 10b The identity of 10c...

Ngày tải lên: 16/09/2015, 08:32

... sites in heterometallic tetrahedral clusters Studies on metalloselectivity of these clusters have revealed that the selectivity could be influenced by factors such as the nature of the metals and ... Figure 4.3 Isomeric structures of [Ru3Ir(μ-H)3(CO)11(PPh3)] Table 4.1 summarizes the preferred site of substitution of phosphines for various tetrahedral mixed- metal clusters reported in the ... 4.2 Substitution type reactions of Cp*IrOs3(μ-H)2(CO)10, 3c It is evident from the foregoing that clusters containing mixed metals are of interest as sites to probe metallo selectivity and site...

Ngày tải lên: 16/09/2015, 08:32

... about the roles of metal oxides vs organic materials in controlling the adsorption of trace metals to natural heterogeneous materials Indeed, some researchers report that metal oxides are the ... Deming Dong et al position of the solid phase, particularly the content of metal oxides and organic materials Studies have been undertaken to quantify the relative roles of these components in controlling ... overestimation of trace metal associated with the target component For example, when NH2OHÁHCL+HNO3 is used to extract Mn oxides and associated trace metals, the extraction reagent may also desorb trace metals...

Ngày tải lên: 15/03/2014, 23:12

... image of an MWCNTs-doped SnO2 sol (c); FE-SEM image of an MWCNTs-doped SnO2 (d) Please cite this article in press as: N Van Hieu, et al., Gas-sensing properties of tin oxide doped with metal oxides ... member of Physics Society of Vietnam and the Vietnamese Materials Research Society Please cite this article in press as: N Van Hieu, et al., Gas-sensing properties of tin oxide doped with metal oxides ... sensing characteristics of (1 wt%) metal oxides (PtO2 , Fe2 O3 , CuO, La2 O3 )-doped sensors to ethanol gas and LPG have indicated in Fig The sensor responses as a function of operating temperature...

Ngày tải lên: 19/03/2014, 16:48

... the conductivity of nanocrystalline metal oxides The adequacy of above-mentioned model was estimated on the base of results obtained during the impedance spectroscopy of metal oxides At present, ... noble metal clusters accumulate at the step edges of metal oxides (see Fig 31) Due to this behavior of noble metals, an increase of terrace area should be accompanied by an increase in the size of ... process of coalescence starts through the breaking of Me-atoms bonds with the lattice of metal oxides, in Ref [77] it was assumed that the formation energy of surface and bulk vacancies of Me-atoms...

Ngày tải lên: 20/03/2014, 13:11

... 0.4 lb of steam/lb of bone dry biomass The gasifier pressure is 23 psia The olivine circulating flow rate is 27 lb of olivine/lb of bone dry wood Fresh olivine is added at a rate of 0.01% of the ... Performance of Tar Reformer 17 Target Design Tar Reformer Conditions and Outlet Gas Composition 18 Process Conditions for Mixed Alcohols Synthesis 21 System of Reactions for Mixed Alcohol ... ppm of H2S in the syngas to maintain catalyst activity Because the syngas exiting the gasifier contains almost 400 ppmv of H2S, some level of sulfur removal will be required by any of the synthesis...

Ngày tải lên: 25/03/2014, 10:20

... the formation of a large variety of metal oxides at relatively low temperatures via the processing of metal salt or metal alkoxide precursors The structure and composition of nano oxides formed ... is a wet chemical process for the synthesis of colloidal dispersion of inorganic and organic inorganic hybrid materials The synthesis of metal oxides by sol-gel synthesis has proven extremely versatile ... of the metal oxides, one can induce selective adsorption of different metal ions Use of iron oxide nanoparticles is thus becoming very attractive in the area of adsorption or recovery of metal...

Ngày tải lên: 28/05/2014, 14:52

... for Detection of Every Nanotube by Surface-Enhanced Raman Spectroscopy J Am Chem Soc 2009, 131:14310 13 Li J, Tang SB, Lu L, Zeng HC: Preparation of Nanocomposites of Metals, Metal Oxides, and ... ligands, which acted as bridges connecting metal ions and CNMs Our methods can be applicable for a large variety of metal ions By adopting bi -metal or even tri -metal precursors in a certain mole ratio, ... http://www.nanoscalereslett.com/content/6/1/71 Page of Figure TEM images of various metal oxide NPs of Fe2O3, SnO2, CeO2, and TiO2 on a few-layer graphene earth metal oxides on MWNTs See Additional file (SI 5) for more...

Ngày tải lên: 21/06/2014, 06:20

... burning of graphitic layers of nanotubes and a slight weight gain at 850 °C of Ni-encapsulated MWNB may be due to the formation of higher oxides of metal after complete burning of graphitic layers of ... concentrated on the synthesis of SWNT, MWNT and metal- filled MWNT, addressing various key issues such as scale up, reproducibility and low cost Several methods of filling of CNTs by foreign metal nanowires ... Fine powders of alloys, with fresh surfaces, were obtained with several cycles of hydrogen absorption and desorption Synthesis, Characterization and Magnetization Measurements of Metal- Encapsulated...

Ngày tải lên: 21/06/2014, 22:20

... TEM images of Zr-based AB2 alloy filled MWNTs grown at a temperature of 850°C, (c) HRTEM image of Ni-filled MWNT grown at 875°C, (d) TEM image of MWNTs grown at 900°C optical mode E2g of two-dimensional ... the metal surfaces of the metal particle to release carbon, which dissolve in these metal particles The dissolved carbon diffuses through the particle and gets precipitated to form the body of ... analysis (EDAX) spectra of the alloy-filled MWNTs (Fig 2a) showed the presence of Zr, Cr, Fe and Ni; the constituents of the alloy, with a composition comparable to that of the initial alloy used...

Ngày tải lên: 22/06/2014, 22:20

... for this material The advantages and disadvantages of single transition metal oxides LiMO2 have inspired the researches on mixed transition metal oxides to obtain higher reversible capacity for ... I TABLE OF CONTENTS III SUMMARY VI LIST OF FIGURES IX LIST OF TABLES XIII LIST OF SYMBOLS XIV LIST OF PUBLICATIONS ... ratios of metal salt have been tried and compared Difference in structures has been investigated by XRD pattern analysis, indicating sufficient amount of electrospun CNFs can reduce metal oxides...

Ngày tải lên: 09/09/2015, 11:17

... and Design of Experiment 31 3.2 Synthesis of Carbon Coated Tin oxide (SnO2@C) Hollow Spheres 34 3.2.1 Synthesis of PVP-Modified Polystyrene (PS) Beads 34 3.2.2 Synthesis of Tin Oxide ... REVIEW OF METAL OXIDE ANODE MATERIALS 1.3.1 OVERVIEW Metal oxides have been proposed as potential LIB anode materials due to their advantages Firstly, the most attractive feature of metal oxides ... fabrication Besides, most metal oxides are nontoxic and thus environmental friendly However, the usage of metal oxides as anode materials also faces several difficulties Firstly, metal oxides are generally...

Ngày tải lên: 10/09/2015, 09:30

... control of all of them; The synthesis of Ag@AgAu metal core alloy shell nanoparticles with tunable shell composition This type of bimetallic nanoparticles was formed by carefully controlling the synthesis ... In addition to the reduction of metal ions, thermal decomposition of organometallic compounds in the presence of surfactants is another approach to the synthesis of metal 20 Chapter nanoparticles ... and after size sorting of and Ag@AgAu bimetallic of Ag 129 148 IX LIST OF FIGURES Figure 2.1 Schematic illustration of the total free energy of a nanoparticle as a function of the nucleus radius...

Ngày tải lên: 11/09/2015, 09:01

... properties of the metal catalytst depends on following factors (Kacer and Cerveny, 2002): i) type of a metal, ii) structure and morphology of metal particles; iii) surface association of two or more metals ... presence of bimetallic entities was characterized and the bimetallic catalysts were evaluated in D-glucose hydrogenation Chapter is the details of synthesis of the mesoporous carbon microfiber ... structure models of bimetallic nanoparticles are shown in Figure 2.7 Core-shell segregated bimetallic nanoparticles (Figure 2.7a) consist of a shell of one type of atom B surrounding a core of another...

Ngày tải lên: 11/09/2015, 10:18