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Synthesis of Nano H-ZSM-5 for Methanol Conversion to Propylene

Firoozi, Mohammad | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39036 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Baghghalha, Morteza; Asadi, Mousa
  7. Abstract:
  8. Nano and microsize H-ZSM-5 were synthesized by hydrothermal crystallization method with same batch composition to investigate the effect of crystallite size of H-ZSM-5 in the methanol conversion to propylene (MTP) process. The average particle size of nano and microsize H-ZSM-5 were obtained in the range of 0.15- 0.2 and 1- 2 µm, respectively. Also, optimized catalyst of Petrochemical Research and Technology Company was synthesized using terapropylammonium bromide as template. Nowadays, terapropylammonium bromide (TPABr) is cheeper than terapropylammonium hydroxide (TPAOH); therefore we used it as tamplate. Activity tests were conducted at operating conditions of T= 460˚C, P=1 atm and WHSV =1 h-1 with a mixture containing 50 wt. % methanol in water as the reactor feed. All the synthesized zeolites were characterized using XRD, NH3-TPD, BET surface area, SEM and PSA analytical techniques. The surface area, average pore volume and acid site density increased with decreasing the crystal size, but the crystallinity decreased. The nano size H-ZSM-5 showed better performance compared to the micro size H-ZSM-5. For nano and micro H-ZSM-5, maximum selectivity of light olefins and propylene was 83, 63% and 68, 42% respectively. Also, both H-ZSM-5 synthesized using TPABr and TPAOH as template shown same performance, but the selectivity of propylene increased when TPABr used as template
  9. Keywords:
  10. Selectivity ; Propylene ; Nanozeolite ; Methanol Conversion to Propylene (MTP)Process ; Nano Catalyst

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