Defect engineering to boost catalytic activity of Beta zeolite on low-density polyethylene cracking

Kokuryo, Shinya; Miyake, Koji; Uchida, Yoshiyuki; Mizusawa, Atsushi; Kubo, Tadashi; Nishiyama, Norikazu

doi:10.1016/j.mtsust.2021.100098

Cited by 17 publications

(24 citation statements)

References 40 publications

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“…The catalytic activity of the prepared catalysts was evaluated by degradation of low-density polyethylene (LDPE) using thermogravimetric (TG) analysis. 36 The LDPE/catalyst mixture or pure LDPE was placed in an alumina pan for thermogravimetric analysis. The mass ratio of the catalyst/LDPE mixtures was fixed at 20/80.…”

Section: Methodsmentioning

confidence: 99%

“…35 We have found that the Lewis acidity of zeolites is important for the catalytic degradation of plastics. 36,37 So far, many efforts have been made to enhance the Lewis acidity of zeolites, and it has been reported that this can be achieved by doping metals (e.g., Sn and Zr) into zeolites, but these are only a few of the many elements. 38,39 Herein, we aim to improve the Lewis acidity by doping various metals into zeolites.…”

Section: Introductionmentioning

confidence: 99%

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LDPE cracking over mono- and divalent metal-doped beta zeolites

Kokuryo

Tamura

Miyake

et al. 2022

Catal. Sci. Technol.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

LDPE cracking over mono- and divalent metal-doped beta zeolites

Kokuryo

Tamura

Miyake

et al. 2022

Catal. Sci. Technol.

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“…We synthesized zeolites by a dry gel conversion method referring to our previous report. 52 Here, we used aluminum sulfate hexadecahydrate, Al 2 (SO 4 ) 3 ·16H 2 O, and 35 wt % tetraethylammonium hydroxide (TEAOH) aqueous solution. The precursor solutions were prepared at the mass ratios of 1 ZrO 2 –SiO 2 ( x )/0.57 Al 2 O 3 /1.2 TEAOH/0.2 NaOH/11.2 H 2 O.…”

Section: Experimental Sectionmentioning

confidence: 99%

“…The catalytic activity of the obtained samples for cracking of LDPE was investigated by using thermogravimetric analysis (TGA) according to our previous work. 52 An alumina pan was applied for TGA. The mass ratio of catalyst/LDPE mixtures was fixed at 20 wt %.…”

Section: Experimental Sectionmentioning

confidence: 99%

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Design of Zr- and Al-Doped *BEA-Type Zeolite to Boost LDPE Cracking

et al. 2022

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Nowadays, the increase in plastic waste is causing serious environmental problems. Catalytic cracking has been considered a promising candidate to solve these problems. Catalytic cracking has emerged as an attractive process that can produce valuable products from plastic wastes. Solid acid catalysts such as zeolites decompose the plastic waste at a lower temperature. The lower decomposition temperature may be desirable for practical use. Herein, we synthesized both Zr- and Al-incorporated Beta zeolite using amorphous ZrO 2 –SiO 2 . The optimized Zr content in the dry gel allowed the enhancement of Lewis acidity without a significant loss of Brønsted acidity. The enhancement of Lewis acidity was mainly due to Zr species incorporated into the zeolite framework. Thanks to the enhanced Lewis acidity without any significant loss of Brønsted acidity, higher polymer decomposition efficiency was achieved than a conventional Beta zeolite.

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Utilization of Deposited Coke on Zeolites During the Catalytic Cracking of Nitrogen‐Containing Polymer for the Oxygen Reduction Reaction

Kokuryo,

Shu,

Taniguchi

et al. 2023

Advanced Sustainable Systems

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This work focuses on the development of a new method to utilize deposited coke on zeolite catalysts, formed during the plastic waste cracking. Nitrogen‐doped carbon catalysts are prepared using nylon‐66 and Zn2+ ion‐exchanged ZSM‐5 zeolites. After the cracking reaction, nitrogen‐doped carbon materials are obtained by removing zeolites from zeolite/coke composites using base and acid treatment. The synthesized N‐doped carbon using Zn2+ type ZSM‐5 zeolites exhibits higher catalytic performance on the oxygen reduction reaction (ORR) with an onset potential of 0.95 V (vs RHE) and a half‐wave potential of 0.80 V (vs RHE) than that using H+ type ZSM‐5 zeolites. The characterization revealed that the evaporation of Zn2+ in zeolites significantly enhanced the porosity of N‐doped carbon. Moreover, the aromatization and poly‐cyclization reactions promoted the generation of highly active edge Valley‐N sites, leading to their outstanding activity on ORR. This work provides new directions for the utilization of deposited coke on zeolites.

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Defect engineering to boost catalytic activity of Beta zeolite on low-density polyethylene cracking

Cited by 17 publications

References 40 publications

LDPE cracking over mono- and divalent metal-doped beta zeolites

LDPE cracking over mono- and divalent metal-doped beta zeolites

Design of Zr- and Al-Doped *BEA-Type Zeolite to Boost LDPE Cracking

Utilization of Deposited Coke on Zeolites During the Catalytic Cracking of Nitrogen‐Containing Polymer for the Oxygen Reduction Reaction

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