The Effect of Mesoporous Increasing On Activity High Silica HZSM-5 Zeolite in the Methanol Conversion to Olefins

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ahmadpour somayeh; Yaripour Fereydoon; Khorasheh Farhad

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Journal: PETROLEUM RESEARCH Year:2018 | Volume:27 | Issue:99 Page(s): 79-92

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Title

The Effect of Mesoporous Increasing On Activity High Silica HZSM-5 Zeolite in the Methanol Conversion to Olefins

Author(s)

ahmadpour somayeh | Yaripour Fereydoon | Khorasheh Farhad | Issue Writer Certificate

Keywords

HZSM-5 zeoliteQ1

Methanol Conversion to OlefinsQ1

DesilicationQ1

Sodium HydroxideQ1

Cetyltrimethylammonium BromideQ1

Abstract

In this paper, the effect of mesoporous increasing on activity high silica ZSM-5zeolite in Methanol Conversion to Olefins investigated. Therefore, for forming the mesoporous, desiliction method with Sodium Hydroxide, tetrapropylammonium hydroxide and Cetyltrimethylammonium Bromide materials are used. The samples were characterized by XRD, FESEM, N2 Adsorption/Desorption and NH3-TPD techniques. The XRD results indicated that using Tetrapropylammonium hydroxide in Desilication process by Sodium Hydroxide (in meso pore Na-TPA sample) caused high crystallinity preservation for Ref-ZSM-5 zeolite. FESEM images for this sample showed cracks and small holes on the surface of crystals. The N2 Adsorption/Desorption results confirmed an increase in the meso pore volume and meso surface area in Na-TPA sample compare to Ref-ZSM-5 zeolite. These new mesoporous, with increasing access to active sites in framework, caused improvement on the catalytic performance. Performing the reactor test on catalyst in same reaction condition showed that this catalyst with methanol conversion higher than 90% in 41 days had acceptable stability. During this time, average of propylene selectivity, total olefins selectivity and propylene to ethylene ratio were 43%, 76% and 6% respectively. While the desilicated sample with Sodium Hydroxide and Cetyltrimethylammonium Bromide showed complete change from Ref-ZSM-5zeolite to mesoporous Al-MCM-41molecular sieves. This molecular sieves with completely mesoporous structure and, acid sites with low strength did not show activity in the methanol to olefin reaction.

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APA: Copy

ahmadpour, somayeh, Yaripour, Fereydoon, & Khorasheh, Farhad. (2018). The Effect of Mesoporous Increasing On Activity High Silica HZSM-5 Zeolite in the Methanol Conversion to Olefins. PETROLEUM RESEARCH, 27(99 ), 79-92. SID. https://sid.ir/paper/115079/en

Vancouver: Copy

ahmadpour somayeh, Yaripour Fereydoon, Khorasheh Farhad. The Effect of Mesoporous Increasing On Activity High Silica HZSM-5 Zeolite in the Methanol Conversion to Olefins. PETROLEUM RESEARCH[Internet]. 2018;27(99 ):79-92. Available from: https://sid.ir/paper/115079/en

IEEE: Copy

somayeh ahmadpour, Fereydoon Yaripour, and Farhad Khorasheh, “The Effect of Mesoporous Increasing On Activity High Silica HZSM-5 Zeolite in the Methanol Conversion to Olefins,” PETROLEUM RESEARCH, vol. 27, no. 99 , pp. 79–92, 2018, [Online]. Available: https://sid.ir/paper/115079/en

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