Benzene, toluene and xylene (BTX) from in-situ gas phase hydrodeoxygenation of guaiacol with liquid hydrogen donor over bifunctional non-noble-metal zeolite catalysts

Xu-dong Fan, Yu-jian Wu, Zhi-yu Li, Yan Sun, Ren Tu, Pei-Dong Zhong, En-chen Jiang and Xi-wei Xu

Renewable Energy, 2020, vol. 152, issue C, 1391-1402

Abstract: Hydrogen donors were employed to replace pure hydrogen as a hydrogen source for in-situ gas phase HDO due to their low storage and transportation cost. A series of catalysts have been prepared by modifying the zeolite HZSM-5 with polymetallic and multi-carriers. Gas-phase hydrodeoxygenation (HDO) of guaiacol was conducted under a pressure 2 MPa and a temperature at 350 °C. The effect of polymetallic and multi-carrier modification on HDO activity was investigated. The physicochemical properties of catalysts were characterized by BET, XRD, SEM, H2-TPR, XPS and NH3-TPD. The characterization results showed that when La was loaded, the catalyst Ni/HZSM-5&La obtained a stronger medium-strong acidity. The electronic transfer of the elemental nickel was promoted. After HDO, the catalyst Ni/HZSM-5&La exhibited the highest HDO rate and BTX selectivity, reaching 97.79% and 34.25%, respectively. The real bio-oil HDO under a hydrogen donor were also analyzed. The results showed the content of the hydrocarbon compound were over 95%. The reaction mechanism was discussed through the distribution of liquid product species. Direct demethoxylation pathway (DMO) and methylation pathway (ME) were considered as the main pathways.

Keywords: BTX; Hydrodeoxygenation; Guaiacol; Bio-oil; Hydrogen donor (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (4)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:152:y:2020:i:c:p:1391-1402

DOI: 10.1016/j.renene.2020.01.015

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