Dissertation > Excellent graduate degree dissertation topics show

Study on Preparation, Modification and Catalytic Performance of Nano Aluminosilicates Solid Acid

Author: ZhangGuiFang
Tutor: JiangXin
School: Zhejiang University
Course: Chemical Engineering
Keywords: adsorption phase technique nanosized aluminosilicates solid acid doping liquid phase Beckmann rearrangement reaction Cyclohexanone oxime
CLC: TQ426
Type: Master's thesis
Year: 2012
Downloads: 40
Quote: 0
Read: Download Dissertation

Abstract


Aluminosilicates solid acids catalysts play an important role in petrochemical industry. The size and dispersion of aluminosilicates have a significant effect on their catalytic activity especially for the liquid phase Beckmann rearrangement reaction. However, the problems resulting from nanoparticles, including preparation method, actual catalytic performance and stability still need to be addressed. In this paper, a novel efficient supported nanosized-aluminosilicates solid acid catalyst is well designed and prepared by absorption phase method based on previous work.Firstly, well-dispersed and size-controlled nanosized aluminosilicates solid acid is in situ prepared on the surfaces of silica gel particle, by precisely controlling the reaction conditions, including the precursors, the bulk phase. TEM shows that the size distribution of the nano solid acid catalysts is between2and5nm. In the structure fine aluminosilicates particles suggest high acid catalytic performance, and stable silica nanoparticles inhabit the agglomeration of nano-aluminosilicates particles and improving the stability of supported catalysts. The nano-aluminosilicates particles with amorphous phase are filled with some micro phase with ordered structure, illustrated by HRTEM and XRD. These catalysts are used to liquid phase Beckmann rearrangement reaction of cyclohexanone oxime, showing higher catalytic activity. FTIR and NH3-TPD are conducted to interpret the catalytic results. The highest catalytic activity could be achieved by optimized the precursors, the components of bulk phase under following steps.In order to improve the catalytic performance, small amount of other elements, including Ti, Zr, Cr. Mo, W, Co. and Ni are doped into the supported nanosize aluminosilicates to adjust and control the properties of acid sites, considering that their corresponding oxide showing different acid properties. TEM show the morphology and structure changes little. However, the composition and distribution of the acidic sites are largely changed with the element doping, which are evidenced by FTIR, NH3-TPD. According to the Beckmann rearrangement reaction, doping with Ti, Zr, Mo, W. Co, and Ni could highly enhance the catalytic activity, except Cr. For Ni-doping, the doping sequence and amount have great impact on catalytic activity, which is similar to Ti-doping. Both Ni-doping and Ti-doping samples with doping amount of2wt%shows the highest catalytic activity.

Related Dissertations

  1. Preparation and Photocatalytic Properties for Water Decomposition of Titanate Photocatalyst,O643.36
  2. The Study of Preparation and Photocatalytic Activity of TiO2 by Electrospinning,O614.411
  3. Study and Preparation of BaTiO3-based NTC Ceramic Thermistors,TQ174.1
  4. First- principles calculations of doped anatase titanium dioxide photocatalytic properties,O643.36
  5. Preparation of Epichlorohydrin from Crude Glycerol of Biodiesel By-product,TQ223.26
  6. Preparation of One-dimensional Nano TiO2 and Study on the Decolorization of Dyeing Wastewater,TB383.1
  7. First-Principles Studies of Cathode Material LiMO2 （M=Co, Ni, Mn） of Lithium Ion Batteries,TM912
  8. Iron, lanthanum -doped nano TiO \u003csub\u003e 2 \u003c/ sub\u003e Preparation and photocatalytic properties,O614.411
  9. First-Principles Study of Si/Ge Adsorption on Doping Graphene,O469
  10. Supported Tungstophosphoric Acid and Modified of SBA-15 as Solid Acids for THF Polymerization,O643.36
  11. Na, K and Mg of preparation and properties of doped ZnO thin films,TB383.2
  12. Influence of Doping Effect on Zinc Oxide by First Principles Studies,O614.241
  13. Study on Microstructure and Superconducting Properties of MgB2 Wires Fabricated by Two-Step PIT,TM26
  14. Preparation and Photocatalytic Properties of Rare Earth Doped TiO2 and ZnWO4 with Different Morphologies,O643.36
  15. Magnetocaloric Effect in Pure and Doped Magnetic Relaxor Ferroelectrics CdCr2S4,O482.5
  16. Porous MIn 2 S 4 (M = Zn, Cd) photocatalyst Preparation, Characterization and Photocatalytic Performance,O643.36
  17. Preparation and Surface Functionalization of Mg-doped ZnO Quantum Dots,O614.241
  18. Preparation and Characterization of Silica-, Alumina-Based Catalysts for Methanol Dehydration,TQ426
  19. First-Principle Studies of Cathode Materials LiFePO4 and Its Doped Systems for Lithium Ion Batteries,TM912
  20. Study on the Photoluminescence Properties of the Rare Earth Doped Oxide Phosphors Prepared by Hydrothermal Method,TQ422
  21. Synthesis and Electrochemical Performances of New Lithium-ion Battery Cathode Materials Li3V2（PO4 ）3 and Li[NixLi1/3-2x/3 Mn 2/3-x/3)O2,TM912

CLC: > Industrial Technology > Chemical Industry > Reagents and the production of pure chemicals > Catalyst ( catalyst )
© 2012 www.DissertationTopic.Net  Mobile