Dissertation > Excellent graduate degree dissertation topics show

Design and preparation of dextrin hydrolysis hydrogenation to produce a catalyst for sorbitol

Author: XuLiang
Tutor: LiHui
School: Shanghai Normal University
Course: Industrial Catalysis
Keywords: amorphous alloy catalyst dextrin sorbitol saccharifying enzyme hydrogenation yolk-shell structure
CLC: TQ426
Type: Master's thesis
Year: 2013
Downloads: 25
Quote: 0
Read: Download Dissertation

Abstract


Catalysis is the decrease in the activation energy due to the participation of asubstance called a catalyst and thereby increases the rate of chemical reaction withoutchange in the quality and quantity of catalyst during the reaction. Study and usecatalysts can greatly reduce the cost of production, improve product quality, protectthe environment and make rational use of resources. This thesis devotes to thepreparation of highly effective catalyst with large surface area, high catalytic activityand selectity by the nanometer material synthesis technology. The amorphous alloycatalyst prepared by chemical reduction method is a kind of nanocatalyst. Amorphousalloy catalyst is a kind of special material with short-range ordering while long-rangedisordering structure. The composition of alloy and unique structure can be easilymolulated by this chemical reduction method, resulting in excellent catalytic activityand selectivity. Moreover, there is low environmental pollution during the preparationprocess. All these advantages of this highly efficient catalyst is consisten with thedevelopment trend in today’s chemical industrial with the scientific concept of savingenergy and environmental protection, attracting the increasing attention of people.The first part of this thesis modulates the reaction conditions of glucoamylasehydrolyzed dextrin. The second part of the study is the application of Ru-basedcatalyst in the hydrogenation of glucose to sorbitol and its reaction conditions. Thelast part of the study is putting the Ru metal and the enzyme together as the catalyst ofthe hydrolysis-hydrogenation of dextrin to sorbitol. The main content of the thesis isas follow:(1) Starch glucoamylase was used as a catalyst for the hydrolysis of dextrin.Temperature, pressure, the amount of added enzyme and pH value were modulated forthis reaction. A high conversion and high selectivity can be achieved under relativelymild conditions. By using the glucoamylase, the conversion of dextrin reached morethan80%with selectivity of100%, and a glucose aqueous solution with highconcentration can be synthesized. (2) A highly dispersed, high active and high selective Ru-based catalyst forhydrogenation was prepared through impregnation method. In the preparation process,we have adopted the microwave quick-drying method, which decreased the outwardmigration of the metal ions within the pores of the catalyst. Using KBH4as a reducingagent, the metal ions is quickly reduced, preventing the produced metal particles fromagglomeration. Then, a highly dispersed Ru-B amorphous alloy catalyst was preparedfor catalytic hydrogenation. In this chapter, we also optimized the reaction conditionsfor the hydrogenation of glucose. Under the relatively mild reaction conditions, theyield of sorbitol reached99%, and the selectivity was100%. The results showed thatwhen the loading of Ru is2.5%, temperature is75°C, hydrogen pressure is6.0MPa,pH=7.0,80μl of the enzyme is added, the yield of sorbitol is the highest.(3) We studied the problems during one-pot hydrolysis-hydrogenation of dextrinto sorbitol, and produced a catalyst with Yolk-Shell structure to achieve high yield ofsorbitol. We investigated the catalyst preparation method, etching conditions, and therecycling use of the catalyst, and obtained a better result with a sorbitol yield of morethan80%.

Related Dissertations

  1. Study on Using Sepiolite As Supported Catalysts in Selective Hydrogenation of Cinnamaldehyde to Cinnamyl Alcohol,O643.32
  2. Ni / TiO 2 -SiO 2 Preparation, Characterization and Hydrogenation of Maleic Anhydride,TQ225.2
  3. High hydrothermal stability of nickel-based catalyst and hydrogenation of butyne diol,TQ223.162
  4. Metallic Nanomaterials: Synthesis and Catalytic Application,TB383.1
  5. Preparation and Catalysis of Supported Nano-platinum Catalysts,O643.36
  6. Catalytic Transfer Hydrogenation of Biodiesel in Aqueous Media,TE667
  7. Research on the Asymmetric Transfer Hydrogenation of 2-aroyl-1-tetralones and Bis(aroylmethyl)sulfones and Sulfides,O621.25
  8. Investigation on the Asymmetric Transfer Hydrogenation of β-Oxosulfonamides and the Organocatalytic Synthesis of 5-Hydroxypyrazolidines,O621.36
  9. Synthesis, Characterizations and Catalysis of Mesoporous Carbon Material Supported Metal Catalysts,O643.36
  10. Preparation of Supported Gold Catalysts and Their Performance for Selective Hydrogenation of Cinnamaldehyde,O643.32
  11. Synthesis of 2-methyl-4-methoxylaniline by Pt/C Catalytic Hydrogenation,TQ246.31
  12. Preparation and Catalysis of Supported Palladium Nanoparticles Catalyst for Hydrogenation of 2-tertiary Butyl Anthraquinone to Produce H2O2,TQ123.6
  13. Hydrogenolysis of Sorbitol to Lower Glycols Over Ru/CNFs Catalysts,TQ223.162
  14. Pilot Process and Industrial Engineering Design for Continuous Production of p-aminophenol,TQ246.35
  15. Research on the Degradation of Straw Fiber for Chemical Derivatives Development,TQ352
  16. Studies on the Processing Technology and Oxidation Resistance Research of Purple Sweet Potato Wine,TS262
  17. Functionalization of Carbon Nanotubes and Their Preliminary Applications as Supporting Materials,TB383.1
  18. Study on Preperation of P-xylenediamine by Catalytic Hydrogenation,TQ246.31
  19. Study on Improving Limit Dextrinase Activity in the Saccharifying Course,TS262.5
  20. Research on the Quality Improvement of the Dried Meat Slice by Tenderizing and Moisturizing,TS251.1
  21. The Studies of Gluconobacter Melanogenus on the High Concentration Sorbitol Conversion,TQ920.6

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