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Effects of Desilication in NaOH/Piperidine Medium and Phosphorus Modification on the Catalytic Activity of HZSM-5 Catalyst in Methanol to Propylene Conversion

Author(s):

Ebrahim Safaei and Majid Taghizadeh*   Pages 1 - 23 ( 23 )

Abstract:


Aims & Objective: H-ZSM-5 catalysts with a Si/Al molar ratio of 200 were effectively prepared by a microwaveassisted hydrothermal technique through the existence of tetrapropyl ammonium hydroxide (TPAOH).

Methods: The introduction of controllable mesopores into ZSM-5 crystals was performed efficiently via desilication derived from an alkaline NaOH/piperidine solution. Then, the acidic characteristic of the desilicated ZSM-5 specimens was improved using phosphorus modification. The catalysts were subjected to XRD, ICP-OES, BET, FE-SEM, TGA, NH3-TPD and FT-IR analysis. The catalytic activity of the synthesized zeolites in the reaction of methanol to propylene (MTP) was examined in a packed-bed reactor at 475 °C, atmospheric pressure and WHSV of 0.9 h–1.

Results & Conclusion: The findings showed alkaline treatment in NaOH/piperidine solution created uniform mesoporosity with no severe damage in the crystal structure. Similarly, phosphorus modification developed the acidic features and led to the optimal catalytic efficiency in terms of maximum propylene selectivity (49.16%) and propylene/ethylene (P/E) ratio (5.97) as well as the maximum lifetime of the catalyst.

Keywords:

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Affiliation:

Chemical Engineering Department, Babol Noshirvani University of Technology, P.O. Box 484, Babol 4714871167, Chemical Engineering Department, Babol Noshirvani University of Technology, P.O. Box 484, Babol 4714871167



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