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Effects of B-site Al doping on microstructure characteristics and hydrogen production performance of novel LaNixAl1-xO3-δ perovskite in methanol steam reforming

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  • Shen, Qiuwan
  • Shao, Zicheng
  • Li, Shian
  • Yang, Guogang
  • Sunden, Bengt

Abstract

A series of B-site aluminum doped LaNixAl1-xO3-δ (x = 0–1) perovskite samples were prepared by the sol-gel method and applied as catalysts for methanol steam reforming (MSR). The synthesized perovskite catalysts were characterized by SEM, XRD, SEM-EDS, XPS, TEM and BET. Results showed that LaNi0.4Al0.6O3-δ exhibited the highest methanol conversion and hydrogen production amount per unit time. However, the excessive aluminum content led to a decrease in H2 selectivity, and the high W/M promoted the reverse water-gas shift reaction (RWGS), which resulted in a decrease in CO selectivity and an increase in CO2 selectivity. The results of XRD, XPS and BET indicated that the LaNi0.4Al0.6O3-δ catalyst sample still exhibit a very typical perovskite structure after hydrogen reduction treatment. The results also indicated that there were active sites for MSR on the LaNi0.4Al0.6O3-δ sample that were not successfully reduced, but the specific surface area and porous characteristics of the catalyst were changed by H2 reduction treatment. The optimal reaction temperature, GHSV and W/M were determined to be 600 °C, 10,520 h−1, 3:1, respectively. In addition, the LaNi0.4Al0.6O3-δ shows high catalytic activity within 20 h of stability test. The average methanol conversion and H2 selectivity during 20 h were 91% and 93% on average, respectively.

Suggested Citation

  • Shen, Qiuwan & Shao, Zicheng & Li, Shian & Yang, Guogang & Sunden, Bengt, 2023. "Effects of B-site Al doping on microstructure characteristics and hydrogen production performance of novel LaNixAl1-xO3-δ perovskite in methanol steam reforming," Energy, Elsevier, vol. 268(C).
    • Handle: RePEc:eee:energy:v:268:y:2023:i:c:s0360544222034272
    DOI: 10.1016/j.energy.2022.126540
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    References listed on IDEAS

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