Dissertation > Excellent graduate degree dissertation topics show

The Study of Modified Zeolites in the Alkylation of Benzene with Propylene

Author: SongXiangMei
Tutor: ChenBiaoHua
School: Beijing University of Chemical Technology
Course: Chemical Engineering
Keywords: βzeolite MCM-22 zeolite alkylation phosphorus modification alkali-treatment
CLC: O643.3
Type: Master's thesis
Year: 2004
Downloads: 213
Quote: 2
Read: Download Dissertation

Abstract


β、MCM-22 zeolites were modified, the catalytic properties of the modified catalysts in the alkylation of benzene with propylene, as well as the relations between catalytic properties and acidity of catalysts, was studied systematacially，which provides an important theoretics for promoting the industrialization of new catalyst.β、MCM-22 zeolites were modified with different phosphorus sources (（NH4）2HPO4、NH4H2PO4、H3PO4)、different phosphorus contents(P wt%:0.5%、1.0%、1.5%、2.0%). β zeolite was also modified by different concentration of sodium hydroxide solutions(0.05M、0.1M、0.2M). The synthesis of cumene was carried out in a fixed-bed microreactor under liquid-phase over the modified zeolites, the results show that the zeolites modified by proper phosphorus content exhibit excellent reaction selectivity; the selectivity of cumene increased, the content of n-propylbenzene decreased by half and oligomers also decreased; but the catalytic activity was reduced by the alkali-treatment. The acidic properties on surface of the modified catalysts were characterized with TG-DTA, NH3-TPD and FTIR. the results show that the modification of βzeolite by phosphorus decreases the total amount of acid, <WP=6>suppresses acid strength. Phosphorus mainly modified surface acid site of zeolites. The content of phosphorus affects the conditions phosphorus of zeolites surface. While the total acid amount of βzeolite modified with sodium hydroxide solution increased . A siliceous species was selectively dissolved from the framework of zeolite. The acidic property of the zeolites was great influenced by the concentration of sodium hydroxide solution. The relations between catalytic properties and acidity properties of catalysts, was studied. Results show that the strongest acid site of zeolites is against the alkylation of benzene with propylene. The activity of zeolite is related to the acidic intensity and the acidic amount.

Related Dissertations

  1. Synthesis of t- butyl alcohol using tert-butylbenzene, the catalyst selection and research,TQ241.1
  2. The Synthesis of Ethylbenzene by Alkylation of Benzene with Bromoethane,TQ241.1
  3. Studies on the Improvement of Chlorinated Polypropylene with Toluene,TQ325.14
  4. Effect on the Methane Production from the Enhancing Anaerobic Digestion System after Pre-treatment and the Additives,X703
  5. Research on the Industrialization Technology of Sodium Hexadecyl Dephenyl Ether Disulfonate,TQ261.1
  6. Study on the Synthesis of Indoline by Heck Reaction,O626
  7. Preparation of Microcrystalline Cellulose for Synthetic Leather Form Wheat Straw Decomposed by Pollution-Free Process,TQ352
  8. Synthesis of a Novel Hypercrosslinked Resin Via Photochlorination-alkylation and Its Adsorption Performance Study of Phenol,O647.31
  9. Total Synthesis of Lycopodium Alkaloids (-)-8-Deoxyserratinine,O643.32
  10. Synthesis and Insecticidal Activities of 2α/β-Bromo-4α-Alkyloxy-Podophyllotoxin Derivatives,S482.3
  11. Boiling Point Alkylation of Benzene with Propylene and Reactor Simulation,TQ203
  12. Alkylation of Benzene with Ethyl Chloride to Ethyl Benzene,TQ241.1
  13. The Applications of Polymer Supported 2-Phenylimino-2-oxazolidine Chiral Auxiliary,O643.32
  14. Synthesis and Characterization of Mesoporous Mordenite Without the Addition of Organic Template,O643.36
  15. Sec-Butylation of Naphthalene by 2-Butene over Large Pore Zeolite,TQ241.52
  16. Investigation of Sec-Butylbenzene Synthesis from the Alkylation of Benzene with Butylene,TQ241
  17. Investigation of Synthesis of Isopropyltoluene with Toluene Over Zeolite Catalyst,O643.32
  18. Operating Conditions and Kinetics Investgation of Liquid-Phase Alkylation of Benzene with Propylene over Zeolite Catalyst,O643.32
  19. Nutritional and Functional Evaluation of Products Fermented by Chicken Protein,TS251
  20. Mesoporous materials mesoscopic structure and morphology control,TB383.4
  21. Alkylation of Coke-oven Benzene with Ethanol to Ethylbenzene over the Modified ZSM-5 Zeolites,TQ241.21

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