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Microwave-assisted dry reforming of methane for syngas production: a review

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Abstract

Abatement of emissions of greenhouse gases such as methane and carbon dioxide is crucial to reduce global warming. For that, dry reforming of methane allows to convert methane and carbon dioxide into useful synthesis gas, named ‘syngas’, a gas mixture rich in hydrogen and carbon monoxide. However, this process requires high temperatures of about 900 °C to activate methane and carbon dioxide because dry reforming of methane reaction is highly endothermic. Therefore, a solid catalyst with appropriate thermal properties is needed for the reaction. As a consequence, efficient heating of the reactor is required to control heat transfer and optimize energy consumption. Microwave-assisted dry reforming of methane thus appears as a promising alternative to conventional heating. Here we review the recent research on microwave-assisted dry reforming of methane. We present thermodynamical aspects of the dry reforming of methane, and basics of microwave heating and apparatus. We analyse reformers that use microwave heating. Catalysts used in a microwave-assisted reformer are presented and compared with reactors using conventional heating. Finally, the energy balance is discussed.

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Abbreviations

BMR:

Bi-reforming of methane

btoe:

Billion tonnes oil equivalent

CNTs-HPCFs:

Carbon nanotubes-hollow porous carbon fibres

CQ:

Metallurgical coke

C/MR:

Catalyst and microwave receptor

DRM:

Dry reforming of methane

eFe:

Steel-making slag

FTIR:

Fourier transform infrared spectroscopy

IEA:

International energy agency

Microwave-assisted DRM:

Microwave-assisted dry reforming of methane

MAE:

Microwave-assisted extraction

MPO:

Methane partial oxidation

MWCNT:

Multi-walled carbon nanotubes

MWH:

Microwave heating

M/GR:

MWCNT/layered graphene composite

M/CSCNT:

MWCNT/cup-stacked CNT composite

OMR:

Oxy-CO2 methane reforming

PSA:

Pressure swing adsorption

PTO:

Lead titanate

PZT:

Ferroelectric lead zirconate titanate

SEM:

Scanning electron microscopy

SMR:

Steam methane reforming

TEM:

Transmission electron microscopy

VHSV:

Volume hourly space velocity

WGSR:

Water–gas-shift reaction

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Acknowledgements

A part of this work is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under Grant Number “104.05-2019.344” for the project entitled “Syngas generation from bi-reforming of biomass-derived feedstocks using microwave-enhanced reactor”. A part of this work was financially supported by The Japan Society for the Promotion of Science (JSPS) for Grant-Aid for Challenging Research (Pioneering) (17H06225). The authors are also grateful to the Cooperative Research Program of Network Joint Research Center for Materials and Devices that has been supported by Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan.

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Correspondence to Doan Pham Minh.

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Pham, T., Ro, K.S., Chen, L. et al. Microwave-assisted dry reforming of methane for syngas production: a review. Environ Chem Lett 18, 1987–2019 (2020). https://doi.org/10.1007/s10311-020-01055-0

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