Effect of alkali metal occurrence on the pyrolysis behavior of rice straw

ZHANG Yu-jie; WANG Jiao-fei; WEI Jun-tao; BAI Yong-hui; SONG Xu-dong; SU Wei-guang; YU Guang-suo

doi:10.1016/S1872-5813(21)60025-7

Volume 49 Issue 6

Jun. 2021

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Article Navigation > Journal of Fuel Chemistry and Technology > 2021 > 49(6): 752-758

ZHANG Yu-jie, WANG Jiao-fei, WEI Jun-tao, BAI Yong-hui, SONG Xu-dong, SU Wei-guang, YU Guang-suo. Effect of alkali metal occurrence on the pyrolysis behavior of rice straw[J]. Journal of Fuel Chemistry and Technology, 2021, 49(6): 752-758. doi: 10.1016/S1872-5813(21)60025-7

Citation:

ZHANG Yu-jie, WANG Jiao-fei, WEI Jun-tao, BAI Yong-hui, SONG Xu-dong, SU Wei-guang, YU Guang-suo. Effect of alkali metal occurrence on the pyrolysis behavior of rice straw[J]. Journal of Fuel Chemistry and Technology, 2021, 49(6): 752-758. doi: 10.1016/S1872-5813(21)60025-7

Citation:

ZHANG Yu-jie, WANG Jiao-fei, WEI Jun-tao, BAI Yong-hui, SONG Xu-dong, SU Wei-guang, YU Guang-suo. Effect of alkali metal occurrence on the pyrolysis behavior of rice straw[J]. Journal of Fuel Chemistry and Technology, 2021, 49(6): 752-758. doi: 10.1016/S1872-5813(21)60025-7

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Effect of alkali metal occurrence on the pyrolysis behavior of rice straw

doi: 10.1016/S1872-5813(21)60025-7

1.
State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Schoolof Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China
2.
Joint International Research Laboratory of Biomass Energy and Materials, Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
3.
Institute of Clean Coal Technology, East China University of Science and Technology, Shanghai 200237, China

Funds: The project was supported by National Natural Science Foundation of China (21968024), Project of Key Research Plan of Ningxia (2019BCH01001) and Project of Key Research Plan of Ningxia (Special Talent Introduction Project) (2019BEB04037, 2019BEB04001)

Received Date: 2020-11-10
Rev Recd Date: 2021-01-04

Available Online: 2021-03-30

Publish Date: 2021-06-30

Abstract

Abstract

Alkali metals are important factors affecting the process of biomass pyrolysis. In this paper, rice straw (RS) with different occurrence forms of alkali metals was used as the research object. The heat decomposition characteristics, the release law of small molecule gases and the change law of in-situ pyrolysis tar composition were investigated by the thermal mass spectrometer (TG-MS) and thermal pyrolysis-GC/MS (Py-GC/MS) to reveal the action mechanism of different occurrence forms of alkali metals in the pyrolysis process. The results showed that with the increase of the removal degree of alkali metal from rice straw, the release temperature of small molecules during the pyrolysis shifted to the high temperature region, due to the catalytic effect of alkali metals on the escape of small molecules. The different occurrence forms of alkali metals had different influences on the tar components. Water-soluble alkali metals inhibited the production of alcohols and promoted the production of ketones and aldehydes. Ion-exchanged alkali metals had different effects on oil composition at different temperatures. At the pyrolysis of 300 ℃, the presence of ion-exchanged alkali metals inhibited the production of aldehydes and ethers, and promoted the production of esters and ketones, but opposite effect was obtained at the temperature higher than 400 ℃. Kinetic analysis showed that both water-soluble alkali metal ions and exchanged alkali metal could reduce the activation energy of biomass pyrolysis.
- straw,
- pyrolysis,
- alkali metal,
- occurrence form,
- tar

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References(23)

References

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