STUDY ON HYDROGEN PRODUCTION CHARACTERISTICS FROM SUPERCRITICAL WATER GASIFICATION OF RICE HUSK

He Zigan; Wang Cong; Han Jianing; Zhai Lianbao; Zhu Jian; Kou Jiajing

doi:10.19912/j.0254-0096.tynxb.2024-1518

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (1) : 21-27. DOI: 10.19912/j.0254-0096.tynxb.2024-1518

STUDY ON HYDROGEN PRODUCTION CHARACTERISTICS FROM SUPERCRITICAL WATER GASIFICATION OF RICE HUSK

He Zigan¹, Wang Cong², Han Jianing³, Zhai Lianbao¹, Zhu Jian¹, Kou Jiajing¹

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Abstract

This study employed rice husk as the native biomass and investigated the effects of reaction temperatures （350- 500 ℃）, concentrations （1%-4%）, and an alkali metal catalyst （K₂CO₃） on the performance of supercritical water gasification for hydrogen production. Experimental results indicated that increasing reaction temperature and decreasing reactant concentration could effectively enhance the carbon gasification efficiency （CGE） and reduce the coking rate of rice husk. Under non-catalytic conditions, the optimal conditions for supercritical water gasification of rice husk were identified as 500 ℃ and 1%, achieving a CGE of 37.6% and an H₂ selectivity of 48.3%. Although the supercritical water environment facilitates the dissolution and hydrolysis of biomass, providing ample water to strengthen gas production reactions such as steam reforming and water-gas shift reaction, coking during gasification of rice husk remains an intractable issue that impedes its further gasification. The addition of K₂CO₃, however, significantly diminished the formation of coke. Under the optimal conditions, the CGE of rice husk achieved 49.2%, with total gas yield reaching 58.70 mol/kg. The residual solid, as analyzed by Thermogravimetric Analysis, was virtually carbon-free, indicating that the alkali metal catalyst may intensify the hydrolysis of rice husk, thereby promoting the transference of carbon from the feedstock to the gaseous and liquid phases. In addition, K₂CO₃ exhibited excellent H₂ selectivity for gasification of rice husk, with an H₂ selectivity of 71.0%. And the yield of H₂ also reached 41.66 mol/kg, which was 3.5 timses higher than that under the non-catalytic conditions. The experimental results demonstrated the potential for producing hydrogen-rich gas through K₂CO₃ which catalyzed supercritical water gasification of rice husk.

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biomass / gasification / hydrogen production / rice husk / supercritical water / K₂CO₃catalyst

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He Zigan, Wang Cong, Han Jianing, Zhai Lianbao, Zhu Jian, Kou Jiajing. STUDY ON HYDROGEN PRODUCTION CHARACTERISTICS FROM SUPERCRITICAL WATER GASIFICATION OF RICE HUSK[J]. Acta Energiae Solaris Sinica. 2026, 47(1): 21-27 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1518

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