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Selective production of propylene from methanol: Mesoporosity development in high silica HZSM-5

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Abstract.
The mesoporosity development in high silica HZSM-5 was carried out by alkaline desilication treatment
and soft template method, and its relationship with the catalytic performance of the modified catalysts in
methanol-to-propylene reaction was studied. High propylene selectivity (42.2%) and propylene/ethylene
ratio (10.1) were observed on the high silica HZSM-5 catalyst modified by alkaline desilication. The
enhanced catalytic performance can be attributed to the newly created open mesopores on the surface
of the zeolite crystals together with the low Brønsted acidity. A greater amount of mesoporosity could
be readily formed in HZSM-5 crystals via the soft template route. However, the mesopores formed in
this method are randomly distributed in the zeolite crystals and play a minor role in the molecular
transport of the reaction, so the improvement in propylene selectivity and propylene/ethylene ratio of
the catalyst is less evident. The higher propylene selectivity and propylene/ethylene ratio on modified
HZSM-5 (especially by alkaline treatment) than unmodified HZSM-5 could be also related to different
contributions of the methylaromatics route and olefins methylation/cracking route in MTP reaction.

Keywords:
HZSM-5
Methanol-to-propylene process
Propylene selectivity
Propylene/ethylene ratio
Mesoporosity
Diffusion

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Informasi Detail

Judul Seri

Journal of Catalysis

No. Panggil

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Penerbit

London : Elsevier Inc.., 2008

Deskripsi Fisik

Journal of Catalysis 258 (2008) 243–249

Bahasa

English

ISBN/ISSN

00219517

Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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