Table · dataset · 2026
Extra-Framework Al-Modified Defective Hierarchical ZSM‑5 Zeolite for Catalytic Cracking of n‑Pentane to Olefins
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In the catalytic cracking of naphtha to light olefins over conventional microporous ZSM-5 zeolite, issues such as high mass-transfer resistance leading to low conversion and high acid-site density causing olefin consumption are commonly encountered.
Description
In this work, a hierarchical nanosponge ZSM-5 zeolite (NP) with a Si/Al ratio of 20 was synthesized. Acid washing was applied to reduce the acid-site density and introduce defects (NP-Aci).
Furthermore, extra-framework Al was introduced via impregnation to modify the defective hierarchical-porous ZSM-5 (Al/NP-Aci). Characterization results confirm that the impregnated Al is anchored at defect sites, existing as extra-framework Al that acts as a Lewis acid. In <i>n</i>-pentane cracking, the Lewis-acid-modified Brønsted acid sites promote the monomolecular cracking of <i>n</i>-pentane, while the lowered acid density suppresses the bimolecular hydrogen transfer of the olefins.
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At 600 °C, the Al/NP-Aci catalyst achieves 98.03% <i>n</i>-pentane conversion, with ethylene and propylene selectivity of 30.12% and 19.63%, respectively. Moreover, the Al/NP-Aci catalyst exhibits excellent cracking stability, showing a deactivation rate of only 3.81% after 16 h of reaction at 600 °C under a weight hourly space velocity (WHSV) of 6.26 h<sup>–1</sup>.
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Where it is published
- DOI doi.org/10.1021/acs.iecr.6c03025.s001 ↗
DOI / persistent id · from zivahub uct ac za
Catalogue records · 1
- OAI-PMH record api.figshare.com/v2/oai?verb=GetRecord&metadataPrefix=oai_dc&identifier=oai%3Af… ↗
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Topics
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- Astronomy & Astrophysics · Biochemistry and cell biology · Bioinformatics and computational biology · Cancer · Chemistry · Earth & Environmental Science · Ecology · Evolutionary biology · Genetics · Infectious diseases · Life Sciences · Medicine & Health · Research, science and technology policy
Provenance · 1 source records, 18 field assertions
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|---|---|---|---|
| ZivaHub | oai:figshare.com:article/34018284 | 11 d ago | JSON v1 |
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