Dissertation > Excellent graduate degree dissertation topics show
Synthesis of Hierarchically Porous Materials with Phenolic Resin as a Hard Template
Author: GuoLiFang
Tutor: WuPeng；LiuYueMing
School: East China Normal University
Course: Physical and chemical
Keywords: Multi-level pore structure of materials MFI Phenolic prepolymer Hard template Ordered Mesoporous A hetero atom
CLC: TB383.4
Type: Master's thesis
Year: 2010
Downloads: 131
Quote: 0
Read: Download Dissertation
Abstract
|
This paper mainly around the work of two parts, the first part is the synthesis of multi-level pore structure of materials, the second part is the preparation of mesoporous materials with catalytic properties of metal hetero-atom modified molecular sieve material. The multi-level pore structure of materials referred to in this article refers to the microporous and mesoporous structure of multi-level porous materials. Microporous and Mesoporous Materials advantages of integrated multi-stage pore structure materials having both good hydrothermal stability, and strong acidity, but also has larger than the outer surface area, the higher the intragranular diffusion rate, This makes the multi-level pore structure of materials with potential applications in the actual production and living. In the first part of the work, we tried with phenolic prepolymer hard template, a non-ionic surfactant triblock copolymer Pluronic F127 and tetrapropyl ammonium hydroxide (TPAOH) the soft template prepared containing mesoporous MFI Zeolite . First with phenol and formaldehyde under alkaline conditions to prepare a phenolic prepolymer Then the phenolic prepolymer, a block copolymer Pluronic F127, tetrapropyl ammonium hydroxide (TPAOH), and a silicon source (TEOS) is formed in an ethanol solvent gel, and then at 170 ° C. The PTFE autoclave the static crystallization for 2 days to obtain a raw powder, and finally through a 600 ° C air calcined to remove the a hard organic template and soft template obtained containing mesoporous MF I molecular sieves. Mainly in the synthesis process of the following conditions for the synthetic material. Gel (1) pre-crystallization temperature. Study found that the gel pre-crystallization temperature of the synthesis of mesoporous MFI zeolite has a greater impact on the surface of the sample at 80 ° C under a gel obtained by the pre-crystallization was not smooth, with the presence of mesopores, while 20 ° C was pre- obtained by crystallization with conventional MFI zeolite as a smooth surface, no mesopores sample. (2) The results of the triblock copolymer Pluronic F127 F127 Add conducive to the formation of mesoporous. (3) thermal polymerization temperature. Studies show that thermal polymerization temperature to MFI zeolite crystallization impact through the decomposition of the impact templating agent TPAOH. (4) The amount of phenolic prepolymer. The results show that a certain amount of role play hard template the Resol synthesis system is conducive to the formation of mesopores, but when TEOS: Resol the quality ratio exceeds 5.2:3.5 excess Resol inhibition of MFI zeolite crystallization. (5) tetrapropylammonium hydroxide, the amount of ammonium (TPAOH). The study found that with TPAOH dosage increased, the sample obtained in a more uniform and piled into the secondary particle of the primary particles is reduced. In the second part of the work, we ordered mesoporous polymer modified with metal Ti, Sn, Zr and other atoms - silicon oxide nanocomposites and ordered mesoporous carbon - silicon oxide nanocomposites. The specific synthesis process with reference to a ternary the Zhao research group development of to assemble mesoporous polymer - The method of the silicon oxide material, and on this basis, minor change in the synthetic system catalytically active center atom Ti, Sn. Zr mesoporous catalytic materials, and synthetic materials such as XRD, SEM, UV, BET chemical and physical characterization.
|
Related Dissertations
- Cationic Microemulsion-mediated Synthesis of MFI Zeolite,TQ424.25
- Iron- containing mesoporous carbon composite material synthesis and application of research,TB332
- Template-free Synthesis of Mfi-type Zeolite Membranes,O643.3
- Template Synthesis and Properties of Mesoporous Carbon,TB321
- Study on the Application of Ordered Mesoporous Carbon Modified Electrodes in Electrochemical Biosensors,O657.1
- Studies on the New Carbon Materials Modified Electrodes in Electroanalytical Application,O657.1
- Ordered Mesoporous Carbon Composite Materials and eletrocatalysis,O657.1
- The Modification of Ordered Mesoporous Carbon and the Preparation and Characterization of M@Pt Core-Shell Structure Catalyst,O643.36
- Preparation of Tubular Composite Carbon Membrane for Gas Separation,TQ028.8
- Synthesis, Structure Control and Application of Nanoscaled Zero-valent Iron Supported Ordered Mesoporous Carbon,X51
- Norbornane skeleton chiral mesoporous silicone materials synthesis, characterization and catalytic properties of functionalized,TB383.4
- Ordered Mesoporous Carbon Modified : Synthesis and Applications,O613.71
- Synthesis and Application of Silicalite-1 Zeolite and Carbon Composite Membrane,TQ241.21
- Nanocomposite MFI Zeolite Membranes: Synthesis and Application to Molecular Sieving Separation and Extractor-type Catalytic Membrane Reactor,TB383.2
- Preparation and Performance Studying of the TiO2-Based Nano-Structured Materials,O614.411
- Synthesis and Study on Iron-Containing Ordered Mesoporous Silica Membrane Supported by Hollow Fiber,O613.72
- Study on Ethylene and Methyl Methacrylate Polymerization by Dinuclear Metallocenes of Ti, Zr and Nonmetallocene Ti Complexes,O631.3
- Immobilization of their green catalytic properties of organometallic,O643.3
- Study on Electrochemical Sensors of Morphine,TP212
- Study of Electrocatalysis for Dopamine and Nitrobenzene at a Glassy Carbon Electrode Modified with Ordered Mesoporous Carbon,O657.1
CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
© 2012 www.DissertationTopic.Net Mobile
|