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Extra-Framework
Al-Modified Defective Hierarchical
ZSM‑5 Zeolite for Catalytic Cracking of n‑Pentane
to Olefins
Yifan Wang (380120)
Yajie Tian (1352913)
Xin Yu (124814)
Bofeng Zhang (10525083)
Hongyan Wang (41596)
Hao Yang (328526)
Qian Li (114642)
Guozhu Liu (1295691)
Biophysics
Biochemistry
Space Science
Medicine
Cell Biology
Genetics
Physiology
Pharmacology
Biotechnology
Evolutionary Biology
Environmental Sciences not elsewhere classified
Chemical Sciences not elsewhere classified
Ecology
Biological Sciences not elsewhere classified
Cancer
Science Policy
Hematology
Infectious Diseases
Computational Biology
transfer resistance leading
introduced via impregnation
characterization results confirm
bimolecular hydrogen transfer
63 %, respectively
600 ° c
conventional microporous zsm
hierarchical nanosponge zsm
>- pentane conversion
>- pentane cracking
>- pentane
porous zsm
low conversion
defective hierarchical
monomolecular cracking
catalytic cracking
site density
propylene selectivity
n </
introduce defects
high mass
defect sites
deactivation rate
commonly encountered
aci ).
26 h
16 h
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. 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. 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>.
2026-09-28T00:00:00Z
Text
Journal contribution
10.1021/acs.iecr.6c03025.s001
https://figshare.com/articles/journal_contribution/Extra-Framework_Al-Modified_Defective_Hierarchical_ZSM_5_Zeolite_for_Catalytic_Cracking_of_n_Pentane_to_Olefins/34018284
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