Coal fly ash(FA),a valuable industrial solid residue generated from coal combustion,is composed of var-ious metal oxides and has a high thermal stability.Given that the coal-based energy will continue to account for a significant portion of global electricity generation in the coming years,the lack of effective management strategies exacerbates the threat of FA wastes to the surrounding environment and human health.For a sustainable development,green and renewable hydrogen economy and CO2 capture efforts provide appealing opportunities to valorize FA as catalysts and/or sorbents due to their appealing physic-ochemical properties.Hydrogen applications along with carbon neutrality are potential strategies to mit-igate climate change crisis,but high processing costs(catalysts/sorbents)are challenging to realize this purpose.In this context,the utilization of FA not only enhances industrial competitiveness(by reducing manufacturing costs),but also provides ecologically friendly approaches to minimizing this solid waste.This state-of-the-art review highlights a wide-ranging outlook on the valorization of FA as catalysts and sorbents for hydrogen-rich gas production via conventional/intensified processes(CO2/H2O reforming,ammonia decomposition,hydride hydrolysis).The fundamental physicochemical characterizations and hazards/utilization of FA,which significantly affect the FA's utilization in various fields,are first intro-duced.The influence of several factors(like FA types and catalysis/sorption operation conditions)on the activity performance of FA-based materials is then discussed in detail.This critical review aims to open the window to further innovative ideas regarding the application of different FA residues in other catalytic and sorption processes.

Kang Gao;Maria C.Iliuta

Department of Chemical Engineering,Laval University,Québec,QC G1V 0A6,Canada

能源化学

[1]Kang Gao;Maria C.Iliuta-.Trends and advances in the development of coal fly ash-based materials for application in hydrogen-rich gas production:A review)[J].能源化学,2022(10):485-512

valorize

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