Dissertation > Excellent graduate degree dissertation topics show

Supercritical Catalytic Cracking of N-Dodecane on HZSM-5 and Y Zeolites

Author: WangRanMing
Tutor: ZhangXiangWen
School: Tianjin University
Course: Chemical processes
Keywords: endothermic hydrocarbon fuel supercritical catalytic cracking coke deposit Dodecane HZSM-5 Y zeolite
CLC: O643.32
Type: Master's thesis
Year: 2010
Downloads: 19
Quote: 0
Read: Download Dissertation

Abstract


The cooling technology using the physical and chemical heat sink of hydrocarbon fuel provides the best means for the thermal management of engine system and the body of advanced aircraft. As can offer sufficient cooling capacity and facility in storage, the endothermic hydrocarbon fuels have been widely studied.The endothermic reactions of endothermic hydrocarbon fuels include thermal cracking, catalytic dehydrogenation and catalytic cracking, during which the catalytic cracking is the most potential process. This paper focused on the catalytic cracking of dodecane on HZSM-5 and Y zeolite under supercritical conditions.As reaction temperature increases, catalytic activity, deactivation rate and coke deposition rate increase. Small molecule products, olefins and aromatics also increase with the increase of reaction temperature. With reaction time increases, catalyst activity decreases, coke deposition increases, but the rate of deactivation and coking decrease gradually and eventually become stable. It illustrates that supercritical fluid has some effect of extraction of the coke.For the HZSM-5, the greater the Si/Al ratio, the lower the initial reaction activity, but the reaction activity decline more slowly, and the final stable reaction activity increases with the increase of Si/Al ratio; the coke increases with the Si/Al ratio reduce. And as the Si/Al ratio increases, the olefin products in gas and the small molecular products in liquid increase, but the yield of aromatics decrease significantly. For different types of Y zeolites, little changes were found among their reaction activity, deactivation characteristics and products distribution.It was found that: the catalytic activity and anti-deactivation capabilities of Y zoelite are far less than HZSM-5, the coke is also much higher than that on HZSM-5; the long-chain alkanes species increase significantly, and the number of branched chain also increases, the aromatic and olefin species are much fewer than that on HZSM-5.The simulation of reaction data demonstrate that: for the same reaction temperature (e.g., 400℃), the deactivation rate of 140H is about 58% that of 25H, the carbon deposition rate of 140H is about 38% that of 25H. For the same catalyst sample (e.g., 140H), the deactivation rate at 400℃is about 66% that at 450℃.

Related Dissertations

  1. Study on the Preparation of Biodiesel from Fried Oil with Supercritical Methanol,TE667
  2. The Drying of Tilapia Fillet Using Supercritical Carbon Dioxide,TS254.4
  3. Study on the Chimisorption Removal of FCC Gasoline Sulfur Compound,TE624.55
  4. Experiment Study of the Biogas Purification Process by Zeolite Filling Washing,TQ221.11
  5. The Supercritical Carbon Dioxide Extraction and Functional Quality Evaluation of Camellia Seed Oil,TS225.16
  6. Study on the Preparation Technology and Quality Standard of Danggui Dropping Pills,TQ461
  7. Research on the Efficiency of Circle-Flow Constructed Wetland Process for Swine Wastewater Treatment and Zeolite Regeneration,X713
  8. Cationic Microemulsion-mediated Synthesis of MFI Zeolite,TQ424.25
  9. Study on Removal of Cd2+ in Aqueous Solution on Zeolite 4A,X703
  10. Plateau rape pollen extraction and analysis of fatty acids,S896.4
  11. Study on the Properties of Catalytic Carcking Supported on Compound Catalysts with Heavy Aromatics,TQ203.2
  12. Research on the Lumped Reactions Kinetic Model for FDFCC Process,TE624.41
  13. Preparation and Characterization of Al2O3/C Hybrid Aerogels and Al2O3 Aerogels,O648.17
  14. Studies on Removal of Trace Water form Methylal,TQ224.1
  15. Preparation of Zeolite Doping Nano-TiO2 and Research of the Photocatalytic Properties,TB383.1
  16. Numerical Analysis of the Heat-Flow Coupling for Rotor of Supercritical Steam Turbine,TK261
  17. Studies on the Component Type and Hypocholesterolaemia Effect of the Effective Constituent Groups in the Fistular Onion Stalk,R285
  18. Supercritical Power Unit Load Control and Optimization Based on Generalized Predictive Control,TM621.6
  19. Modified polypropylene microcellular foam morphology and Control Research,TQ328
  20. Steady-state Thermal Analysis of Gear Transmission System for Supercritical/Ultra-supercritical Thermal Power Units,TH132.41
  21. Test of Advanced Wastewater Treatment by Hydrogen Peroxide,activated Carbon,zeolite Different Combination Processes,X703

CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalytic reaction
© 2012 www.DissertationTopic.Net  Mobile