deposition precipitation synthesis of supported metal catalysts

... nontoxic nature 1.2 Supported metals in nanocatalysts An important group of heterogeneous catalysts is the group of supported metal catalysts, generally containing small metal particles dispersed ... providing new opportunities for the future development of supported metal nanocatalysts In addition, the effects of defects in graphene on supported nanocatalysts were also investigated and it was found ... performance of supported clusters Current research in controlling the catalytic activity of these catalysts has been focused on tuning the size, dimensionality, charging state of supported metal clusters,...

Ngày tải lên: 09/09/2015, 10:15

... 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

... Physicochemical properties of bimetallic Ru-Cu catalysts Table 5.2 The chemisorption results of the catalysts Chapter Table 6.1 Physicochemical properties of Ru catalysts Table 6.2 Metallic dispersions ... migration of the Ru particles (Maris et al., 2006) 1.4 Carbon -supported catalysts for hydrogenation reactions Many heterogeneous hydrogenation catalysts consist of metals or metal compounds supported ... is the details of synthesis of the mesoporous carbon microfiber supported Ru catalysts by Chapter Introduction using alumina microfibers as templates The catalytic performances of the mesoporous...

Ngày tải lên: 11/09/2015, 10:18

... Synthesis of Porous R-Fe2O3 Nanorods so far, there are only a few successful reports on this kind of synthesis, 23-25 including the synthesis of single-crystalline R-Fe2O3 ... facilitated the deposition of the Au colloids on the catalyst supports In a typical preparation, 0.50 g of R-Fe2O3 was added to 10 mL of DI water, followed by 1.5 mL of 0.01 M HAuCl4 and 1.5 mL of 0.01 ... literature, the Au particle size of 2-4 nm is critical for the high catalytic activity of the supported- Au catalysts For comparison, we prepared an Au catalyst supported on the commercially available...

Ngày tải lên: 20/03/2014, 13:08

... 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 ... 2.1.2 Catalysts supported on γ-Al2O3 In order to compare the activity of metallic oxide and precious metal, the metallic oxide catalysts were impregnated on commercial γ-Al2O3 A suitable amount of ... 2.2.1 19 35 Synthesis of the catalysts 2.1.1 2.1.2 2.1.3 14 14 14 14 15 16 17 17 Mechanism of hydrocarbon oxidation over transition metal oxides 28 Mechanism of the oxidation reaction of carbon...

Ngày tải lên: 12/05/2014, 17:14

Ngày tải lên: 15/05/2014, 02:06

... 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 ... mixture of 20 mL ethanol and 70 mL water was used for making Pd-water slurry Synthesis of Pd(0) -metal oxide slurry Typically for the synthesis of CuO, copper acetate was used as the metal salt ... 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

... 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, ... Nanotubes 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 ... efficiency of Fe2O3/SWNTs nanohybrids with a current density of 150 mA g-1 Page of Zhao et al Nanoscale Research Letters 2011, 6:71 http://www.nanoscalereslett.com/content/6/1/71 Page of Figure...

Ngày tải lên: 21/06/2014, 06:20

... of PECVD-grown CNTs b TEM image of ALD ZnO-coated CNTs c and d SEM images of ALD ZnO-coated CNTs e TEM image of ALD AlxOy-coated CNTs Fig Raman spectrum of CNTs before (a) and after (b) ALD of ... Figure 1a shows the TEM image of the typical morphology of the PECVD CNTs prior to deposition Most of the nanotubes are multiwall tubes, and the average diameter of the CNTs is about nm Figure ... CNTs arrays The shell thickness was controlled by the numbers of the ALD cycles A typical deposition consists of 80 cycles For ALD of alumina (AlxOy), trimethylaluminum [Al(CH3)3] and water were...

Ngày tải lên: 21/06/2014, 08:20

... 5:1387–1392 length of nanowires is up to several tens of micrometers Au particle can be found on the top of each nanowire, and the diameter of the nanowire is consistent with the size of Au particle, ... growth of 1-D nanostructures In order to guide the growth of the teeth of nanocombs, Au nanoparticles are introduced in our experiment A thin layer of Au was deposited on the surface of as-grown ... the side surface of Ga2O3 nanowires, which may derive from the difference of surface energy of Ga2O3 crystal planes Orderly arrange of Au nanoparticles on the specific plane of Ga2O3 nanowire...

Ngày tải lên: 21/06/2014, 17:20

... on the synthesis and properties of InN NWs and related oxides such as In2O3 and SnO2 NWs [25–27], a preliminary investigation on the growth of SnxNy NWs was undertaken Here the synthesis of the ... direct nitridation of Sn over a broad range of temperatures i.e between 300–800 °C due to the formation of Sn droplets on the surface of the Si(111) While there is evidence of one dimensional ... rate of NH3 during the growth while keeping everything else equal at all temperatures so the direct nitridation of Sn alone under a flow of NH3 is not effective and leads to the deposition of Sn...

Ngày tải lên: 21/06/2014, 20:20

... 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 ... properties of metal- filled MWNB have been studied using a PAR vibrating sample magnetometer up to a magnetic field of 10 kOe, and the results have been discussed by comparing with those of metal- filled...

Ngày tải lên: 21/06/2014, 22:20

... the influence of growth temperature on the purity of prepared tube samples, we give the curve (Fig 4) showing the dependence of ID/IG on the growth temperature From Fig 4, two kinds of ID/IG distributions ... in the results and are coated by plenty of amorphous carbons Conclusions A temperature window of SWCNTs growth by catalytic chemical vapor deposition of CH4 over Mo-Fe/MgO catalyst has been studied ... the self-decomposition of CH4 The temperature window of SWCNTs efficiently growth is between 800 and 950 °C, and the optimum growth temperature is about 900 °C Fig Influence of growth temperature...

Ngày tải lên: 22/06/2014, 00:20

... alloy used for the preparation of hydride catalysts Figure 2b shows the EDX spectra of Nifilled MWNT TEM and HRTEM images of SWNTs obtained at a growth temperature of 950°C are respectively shown ... 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 ... Fig Dependence of carbon yield on the reaction temperature be through the precipitation of carbon in the form of MWNTs from the molten catalytic particles The melting temperatures of the alloy-C...

Ngày tải lên: 22/06/2014, 22:20

... dissociation of hydrocarbon molecules catalyzed by the transition metal, and dissolution and saturation of carbon atoms in the metal nanoparticle [22] The precipitation of carbon from the saturated metal ... target is made of pure graphite [33] but in case of the target composed of graphite and metal [76] SWCNTs are synthesized 1.3.3 Chemical vapor deposition (CVD) Chemical vapor deposition (CVD) ... the use of metal catalyst The as-synthesized product contains several kinds of carbonaceous and metal particles that could considerably affect the properties of CNTs and the performance of any...

Ngày tải lên: 25/03/2015, 11:57

... entirety, under the supervision of Prof Stephan Jaenicke, (in the laboratory catalysis lab in S5-04-04 and S5-02-02), Chemistry Department, National University of Singapore, between August 2008 ... acknowledged all the sources of information which have been used in the thesis This thesis has also not been submitted for any degree in any university previously The content of the thesis has been ... been partly published in: H H Liu, G K Chuah, S Jaenicke*, N-alkylation of amines by alcohols over alumina-entrapped Ag catalysts using “borrowing hydrogen” methodology, J Catal 292.(2012) 130...

Ngày tải lên: 08/09/2015, 19:36

... the deposition of the active metal on the surface of the solid, strategies of encapsulation of the metal into the micro-meso-porous hosts such as metal oxides and metal organic framework (MOF) ... Supported group 11 nanosized transition metal catalysts in fine chemical synthesis 1.1.1 1.2 Synthesis of supported group 11 catalysts 1.1.2 Group 11 based catalysts in liquid phase reactions Borrowing ... Table 1-4 Examples of supported group 11 metal catalysed hydrogenation reactions Table 2-1 Parameters of XPS measurements Table 3-1 Textural properties of screened supported Ag catalysts in the...

Ngày tải lên: 09/09/2015, 10:14

... Solid supported- metal catalysts in fine chemical and rare sugar synthesis 14 1.3.1 Metal catalysts 14 1.3.2 Supports 16 1.3.3 Preparation of supported- metal catalysts 18 1.3.4 Application of carbon -supported ... the two significant constituent parts of supported- metal catalysts are the doped metal and the supported material 1.3.1 Metal catalysts Normally, novel metals such as platinum, palladium, rhodium, ... of Group MgO catalysts 58 3.2.3.2 BET and XRD results of Group MgO catalysts 62 3.2.3.3 BET and XRD results of Group MgO catalysts 65 3.2.4 CO2-TPD 68 3.2.4.1 CO2-TPD of Group MgO catalysts 68...

Ngày tải lên: 09/09/2015, 10:17

... XIAOWEI Table of Contents Thesis Declaration i Acknowledgements iii Table of Contents iv Summary ix List of Tables xi List of Figures xiii List of Schemes xiv List of Abbreviations xvii List of Publications ... Reaction Optimization for the Synthesis of Chiral 3Chlorooxindoles 134 5.2.2 Substrate Scope for the Synthesis of Chiral 3Chlorooxindoles 136 5.2.3 Facile Synthesis of Various 3-Heteroatom-substituted ... thiourea organocatalysts, including enantioselective synthesis of 3(2H)-furanones and 2,3-dihydrofurans with novel Lthreonine derived bifunctional catalysts, asymmetric formation of 3-spirocyclopropyl2-oxindoles...

Ngày tải lên: 10/09/2015, 09:06

... 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 ... Motivations and Design of Experiment 68 5.2 Synthesis of rGO Incorporated Porous Hollow Fe3O4 Beads (Fe3O4/rGO) 70 5.2.1 Preparation of GO 70 5.2.2 Synthesis of rGO Incorporated ... Design of Experiment 120 7.2 Synthesis of Ultra-small Fe3O4 nanoparticles decorated graphenes (USIO/G) 123 7.2.1 Preparation of GO 123 7.2.2 Synthesis of Ultra-small...

Ngày tải lên: 10/09/2015, 09:30