Study of <scp>Fe‐Ni‐Mg</scp> catalytic activities for hydrogen‐rich gas production from biomass pyrolysis
Qiuxiang Lu, Xu Zhang, Shenfu Yuan, Xiaoguang Xie
Abstract
We investigate the various roles of MgO in Fe-Ni-Mg catalytic system in the catalytic pyrolysis of pine needle biomass in a fixed bed reactor. And the change of productions was discussed to reveal the various roles of MgO at 750°C. We found that in the presence of MgO, hydrogen content was enhanced. And the variation in the Mg/3 Fe 1 Ni mass ratios indicated that MgO could act as a promoter at 750°C, and a catalyst at Mg/3 Fe 1 Ni ratio of <1, and >1, respectively. Moreover, the impact of temperature and heating rate for biomass pyrolysis with 3 Fe 1 Ni 0.4 Mg catalyst were studied. Firstly, as the temperature changed from 450°C to 750°C, hydrogen increases from 40.70 mL/g to 120.98 mL/g. Secondly, when the heating rate was 10°C/min, the gas yield reached the maximum value of 34.27%. At the same time, the content of hydrogen product was also the maximum, 120.98 mL/g, a possible mechanism of biomass pyrolysis with Fe-Ni-Mg catalytic system is proposed. The surface characteristics of 3 Fe 1 Ni, 3 Fe 1 Ni 0.4 Mg and 3 Fe 1 Ni 4 Mg catalysts were analyzed with XRD, SEM, and TEM. XRD results indicated that Fe-Ni alloy was formed during high temperature, which contributed to the enhancement of hydrogen. These findings manifested that Fe-Ni-Mg catalyst can be used as low-cost catalyst to enhance hydrogen.