Pyrolysis of biomass Tar model compound with various Ni-based catalysts: Influence of promoters characteristics on hydrogen-rich gas formation

Xueqin Li, Peng Liu, Tingzhou Lei, Youqing Wu, Wenxuan Chen, Zhiwei Wang, Jie Shi, Shiyong Wu, Yanling Li and Sheng Huang

Energy, 2022, vol. 244, issue PB

Abstract: This paper studied the conditions and mechanism of hydrogen-rich gas produced from catalytic pyrolysis of toluene by various Ni-based catalysts in a fixed-bed reactor. We specifically focused on the effect of different promoters and promoter characteristics on the physicochemical properties of Ni/HZSM-5 -based catalyst. The results revealed that, a similar initial activity for Ni-catalysts modified different promoters was tested with toluene conversion higher than 85%. The Fe-modified Ni/HZSM-5 catalyst has the most effective catalyst for hydrogen-rich gas production with the gaseous efficiency of 63.4 wt%, mainly gas (H2, CH4) yield of 118.6 mL/g-toluene, H2 yield of 53.4 mL/g-toluene at 800 °C pyrolysis for 40 min. The smaller crystal particles (3.1 nm), high surface area (219.5 m2/g), and sufficient loading quality (4 wt%) for Ni–Fe catalysts provided efficient active sites and promoted the pyrolysis process of toluene. The activity and stability of catalysts were also improved by Ce-modified Ni/ZSM-5 catalyst with the highest gaseous efficiency of 68.0 wt%, but the H2 yield of 40.3 mL/g-toluene was lower. However, Ni–Mg/HZSM-5 catalyst has lowest activity and stability. The catalyst deactivation is associated with nickel sintering and coke formation. After the Ni–Fe/HZ5 catalyst was regenerated twice, it still maintained high catalytic activity.

Keywords: Biomass tar; Catalytic pyrolysis; Nickel-based catalysts; Promoters; Hydrogen production (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:244:y:2022:i:pb:s0360544222000408

DOI: 10.1016/j.energy.2022.123137

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