Enhanced microwave absorption capacity of iron-based catalysts by introducing Co and Ni for microwave pyrolysis of waste COVID-19 Masks

Yuwen, Chao; Liu, Bingguo; Qiu, Rong; Hou, Keren; Zhang, Libo; Guo, Shenghui

doi:10.1016/j.fuel.2023.127551

Cited by 6 publications

(3 citation statements)

References 42 publications

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“…Bimetallic catalysts have been attracting researchers' attention, possessing higher development potential due to the synergistic effect. One can use carbon nanotubes to provide the reaction surface and pore structure, while the other active component can act as inhibiting coke formations [89]; moreover, the synergistic effect can also attribute to the electron transfer between both active components [90,91]. For example, iron-cobalt was used to investigate their synergistic effect.…”

Section: Metal-based Catalystmentioning

confidence: 99%

A Review on the Microwave-Assisted Pyrolysis of Waste Plastics

Yang

Shang

et al. 2023

Processes

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The exhaustion of fossil energy and the severe pollution induced by using plastics has forced people to embark on the road to sustainable development. The high value of the recycling of plastics has become an important part of energy conservation. Microwave treatment, owning specific interactions between the electric field and the molecules of treated materials, presents potential advantages in the application of plastic pyrolysis. Therefore, the research status of the microwave-assisted pyrolysis (MAP) of plastics to produce high-value-added liquid oil, gas, and solid carbon was reviewed in this paper. The effects of plastic properties, microwave treatment parameters, microwave absorbers, co-pyrolysis, catalysts, and reactor devices on the process and the products were analyzed. It is essential to optimize the experimental design by studying microwave-assisted co-pyrolysis technology and the application of catalysts, understanding the mechanism of co-pyrolysis to improve product selectivity. At the same time, the continuous MAP device for large-scale plastics treatment still needs to be developed. In addition, developing a large-scale simulation computing research platform for screening catalysts, optimizing processes, and commercial production is required to make the process more efficient.

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Section: Metal-based Catalystmentioning

confidence: 99%

A Review on the Microwave-Assisted Pyrolysis of Waste Plastics

Yang

Shang

et al. 2023

Processes

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“…Transition metals such as Ni, Fe, and Co can also serve as active metals in plastic pyrolysis. [31] This study investigated the influence of different metals on microwave-assisted catalytic pyrolysis. FeO x was selected as the base material owing to its superior performance as a monometallic catalyst.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the high dielectric loss of the catalyst surface resulted in local hot spots under microwave irradiation, which increased gas production and promoted carbon nanotube growth. Transition metals such as Ni, Fe, and Co can also serve as active metals in plastic pyrolysis [31] …”

Section: Introductionmentioning

confidence: 99%

Co‐, Ni‐, and Cu‐Doped Fe‐Based Catalysts for the Microwave‐Assisted Catalytic Pyrolysis of Polyethylene

Zhang,

Li,

et al. 2024

ChemSusChem

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Environmental issues caused by waste polyethylene are becoming increasingly severe. Among potential treatment processes, microwave‐assisted catalytic pyrolysis is promising for converting waste plastics into valuable products owing to its energy efficiency and environmental sustainability. Herein, a modified citric acid combustion method was used to prepare a series of metal oxide catalysts with loose porous structures. The prepared Fe‐based catalysts doped with Co, Ni, or Cu were employed in the microwave‐assisted catalytic pyrolysis of polyethylene. The bimetallic Co1Fe1Ox catalyst exhibited the best performance, yielding hydrogen at a rate of 60.7 mmol/gplastic. Further variation in the Co:Fe ratio revealed that the Co1Fe9Ox catalyst achieved the highest hydrogen production efficiency (63.64 mmol/gplastic). Similar oil‐phase products were obtained over the various catalysts, as revealed by infrared spectroscopy and proton nuclear magnetic resonance spectroscopy. Furthermore, scanning electron microscopy (SEM) identified carbon nanotubes as the major solid product of pyrolysis, which were attached to the catalyst surface. Finally, a combination of thermogravimetric analysis, SEM, and energy‐dispersive X‐ray spectroscopy indicated that the reduction in catalytic activity following recycling was caused by the accumulation of carbonaceous products on the catalyst surface. Overall, Co1Fe9Ox catalysts were favorable for obtaining H2 and carbon nanotubes by the microwave‐assisted pyrolysis of polyethylene.

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