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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

Shen, Qiuwan ; Shao, Zicheng ; Li, Shian ; Yang, Guogang and Sunden, Bengt LU (2023) In Energy 268.
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... (More)

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.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Al doping, Characteristics, LaNiAlO, Methanol steam reforming, Optimal reaction parameters
in
Energy
volume
268
article number
126540
publisher
Elsevier
external identifiers
  • scopus:85146465205
ISSN
0360-5442
DOI
10.1016/j.energy.2022.126540
language
English
LU publication?
yes
id
a0daf30d-c263-4b4b-a005-542676f17842
date added to LUP
2024-01-12 11:39:11
date last changed
2024-01-12 11:39:11
@article{a0daf30d-c263-4b4b-a005-542676f17842,
  abstract     = {{<p>A series of B-site aluminum doped LaNi<sub>x</sub>Al<sub>1-x</sub>O<sub>3-δ</sub> (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 LaNi<sub>0.4</sub>Al<sub>0.6</sub>O<sub>3-δ</sub> exhibited the highest methanol conversion and hydrogen production amount per unit time. However, the excessive aluminum content led to a decrease in H<sub>2</sub> 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 CO<sub>2</sub> selectivity. The results of XRD, XPS and BET indicated that the LaNi<sub>0.4</sub>Al<sub>0.6</sub>O<sub>3-δ</sub> 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 LaNi<sub>0.4</sub>Al<sub>0.6</sub>O<sub>3-δ</sub> sample that were not successfully reduced, but the specific surface area and porous characteristics of the catalyst were changed by H<sub>2</sub> reduction treatment. The optimal reaction temperature, GHSV and W/M were determined to be 600 °C, 10,520 h<sup>−1</sup>, 3:1, respectively. In addition, the LaNi<sub>0.4</sub>Al<sub>0.6</sub>O<sub>3-δ</sub> shows high catalytic activity within 20 h of stability test. The average methanol conversion and H<sub>2</sub> selectivity during 20 h were 91% and 93% on average, respectively.</p>}},
  author       = {{Shen, Qiuwan and Shao, Zicheng and Li, Shian and Yang, Guogang and Sunden, Bengt}},
  issn         = {{0360-5442}},
  keywords     = {{Al doping; Characteristics; LaNiAlO; Methanol steam reforming; Optimal reaction parameters}},
  language     = {{eng}},
  month        = {{04}},
  publisher    = {{Elsevier}},
  series       = {{Energy}},
  title        = {{Effects of B-site Al doping on microstructure characteristics and hydrogen production performance of novel LaNi<sub>x</sub>Al<sub>1-x</sub>O<sub>3-δ</sub> perovskite in methanol steam reforming}},
  url          = {{http://dx.doi.org/10.1016/j.energy.2022.126540}},
  doi          = {{10.1016/j.energy.2022.126540}},
  volume       = {{268}},
  year         = {{2023}},
}