Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 110 for “"silica gel"”.
-
Performance of solar regenerated rotating beds of silica gel
Photocopy of typescript.
-
The drying of air continuously by air-borne silica gel
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1943.
-
Post combustion capture of carbon dioxide through hydrate formation in silica gel column
… flue-gas streams through hydrate formation in a silica gel column. Power plant flue-gas contains essentially CO₂and nitrogen (N2) after suitable pre-treatment steps, thus a model flue-gas comprising 17% co₂and 83% N2 was used in the study. Previous studies employed a stirred-tank reactor to …
-
Solid-state NMR (¹³C, ²⁷Al and ²⁹Si) study of the reaction between AlMe₃ and the silica gel surface
The reaction between the silica gel surface and trimethylaluminum (AlMe3) has been studied in this thesis research. We have examined the AlMe3/silica reaction in the following stages: the initial AlMe3-reacted silica surface after it had been treated with AlMe3; the AlMe3-treated surface after it …
-
Application of synthetic molecular sieve zeolites and silica gel towards the separation of sulfur dioxide from combustion gases
… Molecular Sieves types 13X and AW500 and Davison Silica Gel were the materials studied. The motivation for this investigation was based on the premise that a suitable method for removing sulfur dioxide from combustion gas streams has not been realized. Sulfur dioxide adsorption capacities were …
-
Synthesis and characterization of polyamidoamine dendrons
… Poly AMido AMine (PAMAM) dendrons using silica gel as support and characterize them. PAMAM dendron, a hyperbranch of the PAMAM dendrimer, was divergently synthesized on solid support. Prior to the propagation through (1) Michael addition of acryl ester to an amino reactive site of the …
-
Collection of gas phase chlorine using bonded silica sorbents
Sulfonamide functionalities bound to silica substrates have been investigated for collection of gas phase chlorine. Sorbents were prepared by bonding aminopropyl groups to a substrate (silica gel or filters) and then reacting with alkyl or aryl substituted sulfonyl chloride to produce the …
-
The use of novel mesoporous molecular sieve MCM-41 for the sorption and separation of neutral and overbased sulphonate and phenate lubricant detergents
… were then compared to traditional size exclusion gels and zeolites for their ability to sorb overbased and neutral sulphonate and phenate detergents, which were Soxhlet extracted from base oil, characterised by infrared spectroscopy and the results used to predict possible separations of binary …
-
On-line liquid distribution chromatographic/spectrofluorometric determination of PAH distribution in coal-derived products
… products. The PAHs were isolated by preparative silica gel columns with a hexane mobile phase, and fractionated into five samples based on the number of condensed rings. Each fraction was separated by reverse phase HPLC with an acetonitrile/water mobile phase. Compounds were detected by means of …
-
Leached chrysotile asbestos : characterization, leaching mechanism and use in the synthesis of zeolites
… of transformation of chrysotile to amorphous silica hemihydrate. In the second part, three types of zeolites were synthesized (Na-Y, Na-X and Na-A) using as starting material both silica gel (conventional method) and leached asbestos (new method). In a kinetic study of the crystallization of …
-
Complexos luminescentes de íons lantanídeos trivalentes ligados covalentemente à superfície da sílica gel.
… ligand (DTPA) covalently bonded to the silica gel surface modified with N-(3-trimethosysilylpropyl)diethylenetriamine (3N) and -diketonates ligands such as 2-thenoyltrifluroacetonate (tta), dibenzoymethanate (dbm), 2-acetyl-1,3-indanedione (acind) and 2-benzoyl-1,3-indanedione (bind) as …
-
Síntese e caracterização de um novo agente sililante - imobilização na sílica gel em meio aquoso.
… in solution. The immobilization of AMPTGA onto silica gel surface was carried out in accordance with the principles of green chemistry, which water was used as solvent and at room temperature, under stirred. The new solids were characterized by elemental analysis of CHNS, infrared spectroscopy, …
-
Immobilized Bis-Indenyl Ligands for Stable and Cost-Effective Metallocene Catalysts of Hydrogenation and Polymerization Reactions
… bis-indenyl ligands on the surface of mesoporous silica gel was designed. Four bis-indenyl ligands containing functionalized tethers of various lengths with terminal alkene groups were synthesized. All bis-indenyl ligands were immobilized on the surface of mesoporous functionalized silica gel by …
-
An exploration of the mechanism of hydrophilic interaction chromatography (HILIC) and the application of HILIC in metabolomic profiling
… of acidic and neutral test probes was studied on silica gel based columns which confirmed the hypothesis that HILIC is due to a combination of hydrophilic interactions and electrostatic interactions. Among the acidic probes tested, the more negatively charged maleic acid was not strongly retained …
-
The Structure Function Relationship of Silica Polyamine Composites
… this thesis were to improve the performance of silica polyamine composites by manipulating the surface structure and to understand the relationship between, polymer structure and ligand modification of the grafted polyamine. Improvements in silica polyamine composite performance resulted from …
-
The Structure Function Relationship of Silica Polyamine Composites
… this thesis were to improve the performance of silica polyamine composites by manipulating the surface structure and to understand the relationship between, polymer structure and ligand modification of the grafted polyamine. Improvements in silica polyamine composite performance resulted from …
Page 1 of 6