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Investigation on the mechanism of diffusion in mesopore structured ZSM-5 and improved heavy oil conversion

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Abstract.
A large probe molecule, cumene, was chosen to study diffusion and adsorption on mesopore structured
ZSM-5, using a high precision intelligent gravimetric analyzer. Compared with ZSM-5, a 2–3 order of
magnitude increase in the diffusion coefficient of cumene was observed on the mesopore structured
ZSM-5. The increased adsorption rate and the increased adsorption heat with increased cumene coverage,
supported a mechanism of diffusion, phase transition, and re-arrangement of cumene molecules during
the adsorption process on the mesopore structured ZSM-5. The introduced mesopores also decreased the
diffusion–adsorption activation energy by a factor of 4.6. Consequently, although the amount of strong
Brønsted acid sites decreased, the conversion of cumene on the mesopore structured ZSM-5 catalyst
doubled compared to ZSM-5 catalyst, and the total light olefins yield increased by 2.47 wt% with Daqing
heavy oil as a feedstock.

Keywords:
Mesopore ZSM-5
Diffusion
Phase transition
Re-arrangement
Adsorption heat
Activation energy
Heavy oil cracking

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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) 228–234

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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