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 42 for “"MCM-41"”.
-
Catalytic Ozonation of Emerging Pollutants in Water in the Presence of MCM-41 and Fe-MCM-41
… modification of Mobil Composition of Matter No. 41 (MCM-41) by the incorporation of iron in its molecular structure and the loading of the support (iron substituted MCM-41; Fe-MCM-41) with active metals of manganese and cerium improve the removal of the representative organic pollutants …
-
Using oscillations to detect capillary condensation in MCM-41
… This method was tested using a synthesized MCM-41 sample and propane gas. The principle of the method is to calculate the effective mass from the frequency of the oscillation of a spring-mass system. A weight holder containing MCM-41 was suspended in a pressure vessel with a series of …
-
Investigation of Distribution and Transport of CO2 in Polyimine/MCM-41 Hybrid System: Modeling and Simulation Approach
… exploring CO2 transport in the hyperbranched PEI/MCM-41 hybrid system and conducting an in-depth investigation of CO2 transport in hyperbranched PPI membranes and corresponding MCM-41 systems. Central to the dissertation is the use of multiscale modeling, including First Principles Calculations …
-
The use of novel mesoporous molecular sieve MCM-41 for the sorption and separation of neutral and overbased sulphonate and phenate lubricant detergents
… of large pore sized materials such as MCM-41 enables larger molecules to be separated by the process of size exclusion than by traditional zeolites. In this work, mesoporous materials were synthesised and characterised using powder x-ray diffraction and nitrogen surface studies and …
-
Fabrication of a novel radiopharmaceutical: lutetium-177 loaded MCM-41mesoporous silica
… A method for loading [superscript 177]Lu into MCM-41 was evaluated by varying starting material and loading reaction factors. For the procedure of [superscript 177]Lu loaded MCM-41, cetyltrimethylammonium bromide was dissolved in a solution of 384 ml of MilliQ water heated at 45[degree sign]C …
-
Inclusion of Molybdenum into microporous and mesoporous materials
… large microporous cloverite, and mesoporous MCM-41. The large pore supports were used to produce catalysts that can accommodate catalysis reactions involving large molecules. The objective of this work is to study the preparation and characterisation of the molybdenum supported catalysts. …
-
Sillica Nanoporous Materials Adsorption and Release Study
… materials called mesoporous silicates such as MCM-41, SBA-15 has attracted the attention of many scientists as drug delivery vehicles for their outstanding features like high surface area, high porosity, well-ordered, tunable nanometer pores and "non-cytotoxic" properties.</p> <p>In this …
-
Combined computational and neutron scattering studies of hydrocarbons confined in mesoporous materials
… both as unconfined liquids and confined in MCM-41 and the catalyst Pt/MCM-41 were obtained. Similar combined MD and QENS studies were carried out on toluene and methylcyclohexane as well as on the three xylene isomers, mesitylene and trifluorobenzene. The time and length scales investigated …
-
Interaction of amino acids with different ionogenic groups
… Silikagels und des mesoporösen silikatischen MCM-41. Der Fokus lag auf der Feststellung, welchen Einfluss die Struktur des Silikates als ein Ausgangsmaterial auf die Eigenschaften des hergestellten Materials, auf die Synthese und auf die Effizienz des Produktes in den katalytischen- und …
-
Highly Ordered Hexagonal Mesoporous Silica as Hosts and Templates for Encapsulation of Germanium Semiconductor Clusters
Highly ordered mesoporous MCM-41 silica particles with several morphologies have been synthesized in an alkaline solution using cationic amphiphilic surfactant CTAB as template. The size and the morphology were controlled by varying the reaction temperature and time or by controlling the …
-
Synthesis and characterisation of silica adsorption platforms for use in environmental remediation
In this work a new method of production of MCM-41 was used which involved synthesis under mild conditions (room temperature) and shorter reaction times as well as reduced surfactant removal times (15 min) compared to the previously published methods that take approximately 10 h. This material was …
-
Spectroscopic and Kinetic Studies of Hydrodenitrogenation and Hydrodesulfurization over Supported Nickel Phosphide (Ni₂P)
… Ni₂P on different siliceous supports, SiO2 and MCM-41. It also includes characterization of these catalytic materials using X-ray diffraction (XRD), temperature-programmed reduction (TPR), Fourier transform infrared (FTIR) spectroscopy and X-ray absorbance fine structure (XAFS) spectroscopy. In …
-
Studies of liquid-liquid phase transition and critical phenomena in supercooled confined water by neutron scattering
… pores of a mesoporous silica material MCM-41-S. By being able to suppress the homogenous nucleation process inside the narrow pore, one can keep water in the liquid state down to at least 160 K. We observe a density minimum at 210±5 K. This is the first experimental evidence of the …
-
Neutron scattering investigations on the liquid-liquid transition in deeply cooled confined water
… water in a hydrophilic nanoporous material, MCM-41, the homogeneous nucleation process can be avoided, which allows us to keep water in liquid state at least down to 130 K. Therefore, the confined water provides us an opportunity to detect the hypothetical HDL and LDL in the deeply cooled …
-
Pirólisis de biomasa residual abundante en la región sur de la provincia de Buenos Aires para la obtención de productos de alto valor agregado
… de la presencia de catalizadores de la familia MCM-41 en contacto con la celulosa. Se establecen las relaciones entre las propiedades fisicoquímicas de los catalizadores y los rendimientos a los productos. Se destaca el catalizador Al-MCM-41 que produce 60 % de líquido con 89 % de …
-
Inorganic nanoparticles for applications in biomedical sciences
… lines was studied. 3) Tetracycline-Containing MCM-41 Mesoporous Silica Nanoparticles for the Treatment of Escherichia Coli: Tetracycline (TC) is a very well-known antibiotic whose use has been limited due to drug resistance. Nanoparticle formulations, can help overcome the resistance mechanisms …
-
Valorización de etanol y acetona mediante procesos catalíticos
… conversiones al utilizar aluminosilicatos tipo MCM 41 y zeolitas BEA como catalizadores. Sin embargo, estos resultados están condicionados por la obtención de ácido acético e isobuteno. El aporte de H2 mejora la estabilidad y la actividad de ambos materiales. Consecuentemente, se propuso un …
-
Preparation and Characterisation of Ionic Liquids and Investigations into their Potential use in the Absorption and Sequestration of Carbon Dioxide
… were immobilised onto a mesoporous silica (MCM-41) and their CO2 absorption capability was investigated. These contained NH2 functionality and as such are capable of CO2 absorption through the formation of a carbamate species. The low volatility of the ionic liquids compared to amines, such …
-
X-ray Scattering Study Of Capillary Condensation In Mesoporous Silica
… of the fluid. Periodic mesoporous silica such as MCM-41 and SBA-15 were synthesized and used as the samples with water as the capillary condensation agent.The gas sorption method and SAXS were used to extract the pore parameters of the samples.The stresses acting on the silica scaffold due to the …
Page 1 of 3