Dissertation > Excellent graduate degree dissertation topics show

Preparation and Application of C-MCM-22 Composite Zeolites

Author: ShenWeiBin
Tutor: FangZuoWen
School: Shantou University
Course: Industrial Catalysis
Keywords: hard template zeolites MCM-22 composite zeolites
CLC: TB383.4
Type: Master's thesis
Year: 2010
Downloads: 58
Quote: 0
Read: Download Dissertation

Abstract


For hard templates have good stability and spatial confinement, the hard template method is a very important method for synthesizing composite materials and the zeolites with specific size and morphology.In this paper, firstly, SiO2 colloidal crystal and MCM-22 zeolites were synthesized. Secondly, macroporous carbon zeolites were prepared using SiO2 colloidal crystal as hard template. Thirdly, granular C-MCM-22 composite zeolites were prepared using carbon zeolites as hard template, and monodisperse C-MCM-22 composite zeolites were preapared using MCM-22 zeolites as hard template. All the materials were characterized by XRD、SEM, and so on. At last, composite catalysts were used in the synthesizing of dimethyl carbonate （DMC）by gas-phase oxidative carbonylation of co-feeding methanol with dimethyl ether. The results aresummarized as follows:1. Monodisperse SiO2 microspheres were prepared by sol-gel method. Then, SiO2 colloidal crystal was synthesized by solvent evaporation method. Finally, macroporous carbon zeolites were prepared using SiO2 colloidal crystal as hard template. The characterized results indicated that the monodispersed SiO2 microspheres with diameter about 200nm had regular spherical shape, and the SiO2 colloidal crystal was ordered. The macroporous carbon zeolites have copied the ordered structure of SiO2 colloidal crystal. Its bore diameter was as large as the bore diameter of SiO2 microspheres.2. Using hexamethyleneimine（HMI） as soft template, and the macroporous carbon zeolites as hard template, granular C-MCM-22 composite zeolites were prepared by static hydrothermal crystallization. The characterized results of SEM and XRD showed that the lamellar MCM-22 zeolite had grown inside the macroporous carbon zeolites. The shape of this MCM-22 zeolites were different from the common MCM-22 zeolites. Its diameter ranges from 50 nm to 200 nm.3. Monodisperse MCM-22 zeolites were prepared by static hydrothermal crystallization method. Then, the monodisperse C-MCM-22 composite zeolites were prepared by static hydrothermal crystallization method, using sucrose as carbon source and MCM-22 zeolites as hard template. The characterized results proved that the MCM-22 zeolites was thin pancake-shaped, and the monodisperse C-MCM-22 composite zeolites, wrapped by a layer of carbon, was thin pancake-shaped too. After the MCM-22 zeolites were moved away from C-MCM-22 by HF, the zeolites are pancake-shaped with hollow.4. The space time yield of DMC over the mixed catalysts of Cu-Pd-TBAB/AC and Cu-Pd/MCM-22 could be improved effectively after the dimethyl ether was introduced to the gas-phase oxidative carbonylation of methanol. However, the catalytic performance in the co-feeding system over the bi-functional catalysts, which were prepared by using the monodisperse C-MCM-22 composite zeolites or granular C-MCM-22 composite zeolites as support, was decreased.

Related Dissertations

  1. Catalytic Performance of HZSM-5 Modified by Mn/Fe-Mn for the NH3-SCR,O643.32
  2. Study on Microwave-Assisted Synthesis of MWW-Type Zeolites,TQ424.25
  3. Ammonia Removal from Well Water Using Natural Zhenjiang Zeolite,X52
  4. Synthesis of Aluminophosphate Zeolites in Imidazolium Based Ionic Liquids,TQ424.25
  5. Synthesis and Characterization of Hierarchical-Structured Mordenite,O643.36
  6. Study of the Adsorption on External Br(?)nsted Acid Sites in H-MCM-22 Zeolites by Theorical Calculation,O647.31
  7. Studies on Friedel-Crafts Reation of Anisole Catalyzed by Zeolites,O643.32
  8. MCM-22 zeolite supercages the acidic and reaction theory study,O643.32
  9. Ⅰ. High coordination A1 of aluminum phosphate skeleton of the research Ⅱ. Molecular sieve nanocomposites nonlinear optical materials exploration research,TQ424.45
  10. Adsorption and Separation of Alkanes in Zeolites by Molecular Simulations,O647.31
  11. Solid State NMR Studies of the Acidity of Microporous and Mesoporous Materials,O482.532
  12. Preparation and Characterization of Porous Oxide Spherical Particles,TB383.4
  13. Synthesis and structure of ordered organic polymer mesoporous materials,TB324
  14. Hierarchical Zeolite: Synthesis, Characterization and Catalytic Application,O643.36
  15. Investigation of Adsorption Process on Zeolites and Modified Zeolites by Frequency-Response Method,TQ028.15
  16. The Research of Mechanical Properties of Microporous-Inorganic Single Crystas,O733
  17. Density Functional Theory Study on MCM-22 Zeolite,O643.36
  18. Theoretical Investigations on Properties and Modification of Two Material Molecules,O643.36
  19. Application of Zeolite NaA Membranes in Selective Oxidation Reaction,O643.36
  20. The Research on the New Catalyst Material for Olefin Isomerization in FCC Gasoline,TE624.9

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
© 2012 www.DissertationTopic.Net  Mobile