Dissertation > Excellent graduate degree dissertation topics show

Ruthenium Catalyst Supported on Alumina for Ammonia Synthesis

Author: ZhangXinBo
Tutor: LiXiaoNian
School: Zhejiang University of Technology
Course: Industrial Catalysis
Keywords: Ruthenium Alumina Supported catalyst Ammonia synthesis Surface basicity
CLC: TQ426
Type: Master's thesis
Year: 2002
Downloads: 144
Quote: 1
Read: Download Dissertation

Abstract


Ruthenium-based catalyst for ammonia synthesis is considered second generation Following the fused iron catalyst for ammonia synthesis catalyst research regardless of the application or in the theoretical aspects are of great significance. In this paper Research ruthenium catalysts for ammonia synthesis problems, especially the research status quo of the alumina-supported ruthenium catalysts for ammonia synthesis. Domestic ruthenium-based ammonia synthesis catalyst on activated carbon as a carrier has more detailed study, Ruthenium Ammonia synthesis catalyst on alumina than less. This thesis is a detailed study of catalyst preparation conditions, promote and alumina modified alumina-supported ruthenium catalysts for ammonia synthesis activity, the following main results: 1) to study the impact on the catalytic activity of the preparation conditions of the carrier. Effects of the precipitating agent NaOH, KOH, NH 3 H 2 O, (NH 4 ) 2 CO 3 the impact on the catalyst activity, having reaming (NH 4 ) 2 CO 3 obtained catalyst activity higher. Investigated using XRD, BET and CO 2 -TPD Al (OH) 3 (600,700,800,900 ℃) calcination temperature of alumina-supported ruthenium-based catalyst activity the impact. The study found that as the calcination temperature, the activity of the catalyst is increased, and the highest value at 800 ℃. Within the scope of the present thesis, the crystallization of the carrier phase is changed; as the calcination temperature increased, the specific surface area of ??the carrier is decreased, while the amount of alkali on the carrier per unit area and per unit mass increases. Therefore, it can be that catalyst activity decreased as the calcination temperature rise is a result of the interaction of the surface area of ??the support surface alkaline. The basicity of the carrier is a major factor affecting the activity of the catalyst. 2) to study the different reduction temperature (350,450,550,650,750 ℃) Ba-Ru-K/Al 2 O 3 catalyst activity. As the reduction temperature increases, the activity of the catalyst is increased at first decreased, but the influence of the reduction temperature on the catalyst activity is not large. 3) to study a single accelerator K, Ba, Sm, K, Ba content and accelerator Sm-K, Ba-K alumina-supported ruthenium catalysts for ammonia synthesis activity. Additives K, Ba, Sm can significantly improve the activity of the catalyst, and the Ba-K, Sm-K pairs of promoting catalyst activity is higher than K, Ba, Sm, single-promoting activity of the catalyst. The study found that the impact of pressure on the activity of the catalyst with the aids is different to K accelerator Ru / Al 2 O 3 catalyst, the change in pressure substantially no effect on the activity of the catalyst; Sm or Ba as a promoting agent catalyst activity increases as the pressure increased. This may be due to the the K promoted H 2 strong chemical adsorption, inhibit the dissociation of nitrogen adsorption caused. Abstract 4) to study the alkaline earth metal - alumina composite oxide (MgO-AI the O Pu the BaO-AI Blade hCaO, AI O Bu SrO-hi O * load nail base ammonia synthesis catalyst activity, study of the alkaline earth metal oxide content influence on the activity of the catalyst using XRD, BET and Co. TPD investigated by means of the carrier structure and nature of the catalytic activity of the composite oxide of the load is higher than the activity of the alumina supported catalyst. magnesium composite carrier MgAI. O. crystalline phase exists, with ugo content increases, the surface area of ??the carrier to reduce the basicity increases aluminum barium composite carrier mainly to B8klZO4 crystalline phase exists as BSO content increases, the surface area of ??the carrier is first increases and then decreases, the carrier the surface alkaline increase. 5) to study a single accelerator Ba, K and dual accelerator the BaK of different composite oxide support (tgo-i o, sac-i o. for CaO-i o, s0-m o) load staple yl catalytic Qi promoting effect, with the different carriers, the promoting effect of the accelerator is not the same. But in general, Ba. K Dual promote promotion and Ba single composite oxide supported catalysts have a higher activity. And studied the influence of pressure on the activity of the catalyst, and K is the promoting agent, the pressure on the activity of the catalyst substantially did not affect aluminum barium composite carrier loads nail base activity of the catalyst is not sensitive to pressure.

Related Dissertations

  1. Ceramic Theramal Sterss Cleaving Technology Based on Laser,TQ174.62
  2. The Preparation of Polyaniline-Metal Complex and the Study on Its Catalytical Property,O634
  3. Gel - Foam Preparation of porous alumina insulation materials,TQ174.1
  4. Lithium anode material calcined alumina crucible Development,TQ174.6
  5. Synthesis, Conducting Properties and Application of Bax Ce0.8Y0.2O3-α + yZnO,TQ174.1
  6. CFD Simulation and Verification Experiment of Fluidized Bed with a Adjustable Slit Height Blast Cap,TQ051
  7. Synthesis, Characterization of Co3O4 /Al2O3 Nanomaterials and Catalytic Degradation on Rhodamine B,TB383.1
  8. Based on the porous structure to improve efficiency of LED light,TN312.8
  9. Development of Ru/C Catalysts for Hydrogenation of Glucose to Sorbitol,O643.36
  10. Precipitation from aqueous solution ultrafine spherical alumina Process,TB383.3
  11. Porcelain steel surface preparation in the lining layer of Technology,TG174.45
  12. One -dimensional properties of the material humidity,TB383.1
  13. 2M219 continuous wave magnetron cathode solder research,TN123
  14. Alumina vacuum carbothermal reduction experimental study of the mechanism and process - aluminum chloride process,TF821
  15. Alumina vacuum carbothermal reduction experimental study,TF821
  16. Processing and Characterization of Short Fiber-reinforced Aluminium Matrix Composites,TB333
  17. Heterogeneous Hydrogenation of Carbon Dioxide to Formic Acid Over the Supported Ruthenium Catalyst,TQ225.121
  18. Microstructure and Properties of Highly Porous Al2O3 Ceramics by Freeze-casting,TQ174.1
  19. Study on the Recovery of Ammonia Synthesis Catalyst,TQ113.2
  20. Studies on Kinetics of Ammonia Synthesis and Hydrogen Inhibition on Carbon-supported Ru Catalysts,TQ113.25
  21. Preparation and Characterization of Ru/CeO2 Catalysts for Ammonia Synthesis,O643.36

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