Cr⁶⁺ Loaded Lewis Acidic Sn-Beta Zeolites as Reusable Catalysts for Selective Production of Light Olefins via Polyolefin Cracking

Kokuryo, Shinya; Tsubota, Soshi; Miyake, Koji et al.

Advanced Sustainable Systems, 2024, 9(3), 2400625

Number of Access:427（2025-08-14 15:06 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/98883

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Title
Cr⁶⁺ Loaded Lewis Acidic Sn-Beta Zeolites as Reusable Catalysts for Selective Production of Light Olefins via Polyolefin Cracking
Creator
CreatorName
Kokuryo, Shinya
CreatorName
Tsubota, Soshi
NRID
1000040844717 1000040844717
ORCID
0000-0001-9868-5391 0000-0001-9868-5391
researchmap permalink
7000028816 7000028816
Scopus Author ID
56594314800 56594314800
CreatorName
Miyake, Koji
NRID
1000060559558 1000060559558
ORCID
0000-0001-5043-9239 0000-0001-5043-9239
researchmap permalink
Yoshiaki_Uchida Yoshiaki_Uchida
Scopus Author ID
8348749200 8348749200
CreatorName
Uchida, Yoshiaki
CreatorName
Mizusawa, Atsushi
CreatorName
Kubo, Tadashi
NRID
1000010283730 1000010283730
researchmap permalink
read0046501 read0046501
Scopus Author ID
7201750198 7201750198
CreatorName
Nishiyama, Norikazu
Subject
catalytic cracking
coking inhibition
lewis acid
light olefin
polyolefin
zeolites
Description
Kokuryo S., Tsubota S., Miyake K., et al. Cr⁶⁺ Loaded Lewis Acidic Sn-Beta Zeolites as Reusable Catalysts for Selective Production of Light Olefins via Polyolefin Cracking. Advanced Sustainable Systems, (2024); https://doi.org/10.1002/adsu.202400625.
Abstract
Catalysts for the selective recovery of light olefins from polyolefins should be developed to save limited fossil resources. It is previously revealed that Brønsted acid-free Sn-Beta zeolites selectively produced light olefins from polyolefin cracking. Brønsted acid sites ionize olefins by protonation and the generated carbenium ions are converted into other hydrocarbons via various reactions, thereby the elimination of their effects led to the improvement of light olefin production ability. However, the deactivation of zeolites by coke deposition is a critical problem for industrialization. Inhibition of coking deactivation is previously achieved by doping Cr⁶⁺ species connected to silanol groups in zeolites. This work aimed to inhibit coke deposition and realize selective and continuous production of light olefins through repetitive polyolefin catalytic cracking. Sn-Beta zeolites are prepared with various crystallinity by changing the feed fluoride ions content in their synthesis and found that their activity on low-density polyethylene (LDPE) cracking strongly depended on the feed F/Si ratios, implying the active sites for polyolefin cracking are Lewis acidic open-Sn sites. Moreover, Cr⁶⁺-doped Sn-Beta zeolites showed over 45% light olefin yields even in the third LDPE cracking test, although excess Cr adding led to reduce the catalytic activity of Sn-Beta zeolites.
Publisher
John Wiley and Sons Inc
Source Title
Advanced Sustainable Systems
Volume (Issue)
9(3)
Page
2400625
Date of Issued
2024-11-07
Language
English
Handle URL
https://hdl.handle.net/11094/98883
eISSN
23667486
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1002/adsu.202400625
Access Rights
open access
CopyRight
This article is licensed under a Creative Commons Attribution 4.0 International License.
oaire:version
Version of Record
Category
学術雑誌論文 Journal Article