Study on high-value products of waste plastics from microwave catalytic pyrolysis: Construction and performance evaluation of advanced microwave absorption-catalytic bifunctional catalysts

Luo, Juan; Gong, Guojin; Ma, Rui; Sun, Shichang; Cui, Chongwei; Cui, Han; Sun, Jiaman; Ma, Ning

doi:10.1016/j.fuel.2023.128296

Cited by 11 publications

(2 citation statements)

References 49 publications

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“…On the other hand, the introduction of bifunctional catalysts is also a method for designing efficient catalysts. − Liu et al used a mixture of Pt/WO 3 /ZrO 2 and HY zeolite as a catalyst to hydrogenate polyethylene (LDPE) at 225 °C through multiple-stage catalytic hydrogenation, resulting in liquid fuel products composed of gasoline, diesel oil, and kerosene with a yield of up to 85% . The study found that, when Pt/WO 3 /ZrO 2 was used alone as a catalyst, the conversion rate of LDPE, even at higher temperatures, was relatively low.…”

Section: Catalytic Hydrogenolysis Of Polyolefins/polyestersmentioning

confidence: 99%

Catalytic Strategies for the Upcycling of Polyolefin Plastic Waste

Xu,

Tang,

2024

Langmuir

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Chemical upgrading of waste plastics is currently one of the most important methods for addressing plastic pollution. In comparison to the current methods of incineration or landfill, chemical upgrading enables the utilization of carbon and hydrogen elements in waste plastics as resources. This process strongly relies on efficient catalysts and reaction systems. Through catalyst design, waste plastics can be converted into fuels or chemicals under the optimized reaction conditions, extending their life cycles. In this review, we systematically discuss various chemical conversion methods for polyolefin waste plastics, which account for a large proportion of waste plastics. We further explore the remaining challenges and future development trends in this field, including improving product value through product engineering and shifting research perspectives to exploring the tolerance of catalysts toward impurities in practical waste plastic waste rather than using pure plastic feedstock.

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Section: Catalytic Hydrogenolysis Of Polyolefins/polyestersmentioning

confidence: 99%

Catalytic Strategies for the Upcycling of Polyolefin Plastic Waste

Xu,

Tang,

2024

Langmuir

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“…In contrast, carbon monoxide (CO) serves as an indispensable foundational material in organic synthesis, contributing to the production of diverse organic chemicals, including methanol, formamide, dimethylformamide, methyl formatted, and acetic acid (Medrano-García et al 2019;Luo et al 2023). The reduction of carbon dioxide (CO 2 ) to CO represents a transformative approach to converting greenhouse gases into intermediates for the synthesis of high-value-added chemicals (Bai et al 2017).…”

Section: Graphical Abstract 1 Introductionmentioning

confidence: 99%

Variable frequency microwave induced CO2 Boudouard reaction over biochar

Ren,

Jiang,

Wang

et al. 2024

Biochar

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The Boudouard reaction presents promising application prospects as a straightforward and efficient method for CO2 conversion. However, its advancement is hindered primarily by elevated activation energy and a diminished conversion rate. This study employed a microwave reactor with a variable frequency as the initial approach to catalyze the CO2 Boudouard reaction over biochar, with the primary objective of producing renewable CO. The study systematically investigated the influence of various variables, including the heating source, microwave frequency, microwave power, gas hourly space velocity (GHSV), and carrier gas, on the conversion of CO2 and the selectivity towards CO. The experimental findings indicate that under static conditions, with a fixed microwave frequency set at 2450 MHz and 100 W microwave power, the Boudouard reaction did not initiate. Conversely, a CO2 conversion rate of 8.8% was achieved when utilizing a microwave frequency of 4225 MHz. Under this unique frequency, further elevating the microwave power to 275 W leads to the complete conversion of CO2. Furthermore, a comparative analysis between microwave and electrical heating revealed that the CO production rate was 37.7 μmol kJ−1 for microwave heating, in stark contrast to the considerably lower rate of 0.2 μmol kJ−1 observed for electric heating. Following the reaction, the biochar retained its robust 3D skeleton structure and abundant pore configuration. Notably, the dielectric constant increased by a factor of 1.8 compared to its initial state, rendering it a promising microwave-absorbing material. Graphical Abstract

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Preliminary strategy and product analysis of microwave pyrolysis of waste printed circuit board

Liu,

Li,

Shu

et al. 2024

Can J Chem Eng

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In this study, microwave pyrolysis of waste printed circuit boards (WPCBs) was carried out in an inert atmosphere, and the effects of pyrolysis temperature and nitrogen flow rate on the yield and composition of pyrolysis products were investigated. With the increase of pyrolysis temperature, the yield of liquid product increases gradually, and the yield of solid product decreases gradually. At 600°C, the yield of each phase tends to be stable. When the temperature continues to rise, the content of H2 and CO decreases, and the content of C6 ~ C9 in the liquid product decreases. Microwave heating promotes the pyrolysis of brominated epoxy resin, which helps to improve the recovery rate of valuable substances and reduce the environmental impact of waste treatment. This study demonstrates that the microwave pyrolysis of WPCBs in nitrogen atmosphere has great potential in the green recovery process.

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Study on high-value products of waste plastics from microwave catalytic pyrolysis: Construction and performance evaluation of advanced microwave absorption-catalytic bifunctional catalysts

Cited by 11 publications

References 49 publications

Catalytic Strategies for the Upcycling of Polyolefin Plastic Waste

Catalytic Strategies for the Upcycling of Polyolefin Plastic Waste

Variable frequency microwave induced CO2 Boudouard reaction over biochar

Preliminary strategy and product analysis of microwave pyrolysis of waste printed circuit board

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