Dissertation > Excellent graduate degree dissertation topics show

Study on Ni2P Catalysts Supported on TiO2-Pillared Sepiolite for Thiophene Hydrodesulfurization

Author: LiaoHui
Tutor: WangXiang
School: Nanchang University
Course: Industrial Catalysis
Keywords: Ni2P Pillared sepiolite Thiophene Hydrodesulfurization Titanium
CLC: TQ426
Type: Master's thesis
Year: 2013
Downloads: 48
Quote: 0
Read: Download Dissertation

Abstract


With the petroleum becomes heavy, inferior degree deepen and the environmental laws become more and more strict, the sulfur content was strictly limited in the world, there puts forward the concept of deep hydrodesulfurization in both academia and industry. Deep hydrodesulfurization of oil is one of the most effective means to product clean fuel. Therefore, it is very urgent to develop more high-performance hydrodesulfurization catalyst.Transition-metal phosphides have been claimed to be promising new high-activity catalysts for HDS and HDN reactions and have very good resistance to coke deposition and poisoning. Ni2P has been reported as the most active phase among transition-metal phosphides for both HDN and HDS reactions. In this paper, a series of Ni2P catalysts with different supports were prepared by temperature-programmed reduction. Thiophene hydrodesulfurization was chosen as probe reaction to investigate activity of the catalysts. The catalysts were characterized by X-ray diffraction, BET, thermogravimetry(TG), transmission electron microscope and temperature-programmed reduction.In the first part, TiO2-pillared sepiolite was prepared by ion exchange method. The results demonstrated that the specific surface and pore volume of Ti-Sep were enlarged and catalyst thermal stability was improved; the surface acidity was enhanced and surface acid content was increased.In the second part, Ni2P/Ti-Sep catalysts were prepared by temperature-programmed reduction using nickel hydroxide as a nickel source and phosphorous acid as a phosphorus source (Ni/P=1/2), and the catalysts were applied to HDS of thiophene. Consequently, thiophene conversion on Ni2P/Ti-Sep is improved compared with Ni2P/Na-Sep and Ni2P/Ti-Sep, which were prepared on sepiolite without Ti-pillared. Ni2P shows better activity than Ni12P5. Ni2P/Ti-Sep with a Ni loading of15%(w) shows the highest activity among all of the studied catalysts, on which thiophene conversion of can reach100%at400℃. The method supposes an energy saving as there is no need of calcination and a lower reduction temperature is required.In the third part, Ni2P/Ti-Sep catalysts were prepared by temperature-programmed reduction using nickel nitrate as a nickel source and (NH4)2HPO4as a phosphorus source, and the catalysts were applied to HDS of thiophene. The optimum condition of Ni2P preparation was drawn as follows:Ni/P initial molar ratio1/1.25, the final reduction temperature of catalysts600℃, heating rate3℃/min, the optimum Ni load15w%. Thiophene conversion on Ni2P/Ti-Sep is improved compared with Ni2P/Al2O3.

Related Dissertations

  1. Study on the Chimisorption Removal of FCC Gasoline Sulfur Compound,TE624.55
  2. Spectra and Electrochemical Behavior with Analytical Application of Three Herocyclic Bis-Schiff Bases,O626
  3. Studies on the Synthesis of Heterocyclic Compounds Containing Nitrogen Atom Induced by Low-valent Titanium Reagent,O621.3
  4. Preparation and Photocatalytic Properties of Rare Earth Doped TiO2 and ZnWO4 with Different Morphologies,O643.36
  5. Exeprienmental Study on Direct Laser Fabrication of Titanium Matrix Composites Based on Single-path Laser Cladding,TB331
  6. Synthesis of Platinum-based Composite Catalysts and Their Electrocatalytic Properties for Methanol Oxidation,TM911.4
  7. Experiment Studies on the Effects of MMP-2 Expression Induced by Titanium Particles in MC-3T3-E1 Cells in Vitro,R687.4
  8. Photophysical and Charge Transport Properties of Fluorene-thiophene Conjugated Oligomers: A Theoretical Insight into Structure-Property Relationships,O633.5
  9. Studies on Synthesis of the Thiophenes and Applications,O621.25
  10. Photo-induced Charge Transfer Dynamics Study on 2,2’-bithiophene and its Carbonyl Derivatives,O643.12
  11. Synthesis and Photochromic Caused by Visible Light of Conjugated Thiophene Spirooxazine Compounds,O626.12
  12. The Synthesis of Structural Controllable Titanium Dioxide Nanorods Array and Its Electrochemical Performance,TB383.2
  13. Synthesis and Anti-tumor Activities of N’-benzylidene-2-(4-oxothieno [2,3-d] Pyrimidin-3 (4H)-yl) Acetohydrazone Derivatives,R96
  14. Preparation of Highly Reactive Anatase Titanium Dioxide and Its Application in Photocatalytic Hydrogen Generation,TQ116.2
  15. The Study of Selective Catalytic Reduction of NO by CH4 in Combination of Non-thermal Plasma and Catalysts,O643.32
  16. Improvement of Processing Technology for Enhanced Production Quality of Fujian Rice Wine,TS262.4
  17. Study of Thiophene Removal from Light Oil by Adsorption,TE624.55
  18. Study on Novel Fluorescent pH Sensors Derived from Iminocoumarin and Thiophene-carboxaldehyde,O626.12
  19. Study on Chemical Process of Epichlorohydrin (ECH) Via Direct Epoxidation of 3-Chloroprop-1-ene,TQ223.26
  20. Novel Functional Hexaarylbenzene Derivatives: Synthesis and Properties of Hexakis [3-(3’-Thienyl) Phenyl] Benzene Derivatives,TQ251.2
  21. Study on the Preparation and Photocatalytic Activity of Titanium Dioxide Nanoparticles,O643.36

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