TY - JOUR
T1 - Study on activity, stability limit and reaction mechanism of CO self-sustained combustion over the LaMnO3, La0.9Ce0.1MnO3 and La0.9Sr0.1MnO3 perovskite catalysts using sugar agent
AU - Huang, Junqin
AU - Teng, Zihao
AU - Kang, Running
AU - Bin, Feng
AU - Wei, Xiaolin
AU - Hao, Qinglan
AU - Nam Hui, Kwun
AU - San Hui, Kwan
AU - Dou, Baojuan
PY - 2021/5/15
Y1 - 2021/5/15
N2 - The LaMnO
3, La
0.9Ce
0.1MnO
3 and La
0.9Sr
0.1MnO
3 catalysts are synthesized using sugar agent, and the CO self-sustained combustion is investigated, where the catalytic performance is decided by temperature with CO conversions of 10% (T
10), 50% (T
50), and 90% (T
90). The results show that self-sustaining combustion is successfully realized on the catalyst, and the order of activity decrease is as follows: La
0.9Ce
0.1MnO
3 (with sugar) > La
0.9Sr
0.1MnO
3 (with sugar) > LaMnO
3 (with sugar) > LaMnO
3 (without sugar) > La
0.9Sr
0.1MnO
3 (without sugar) > La
0.9Ce
0.1MnO
3 (without sugar). Combined with the results of XPS, H
2-TPR, O
2-TPD and CO-TPD techniques, the excellent activity of La
0.9Ce
0.1MnO
3 (with sugar) can be attributed to the high content of Mn
4+ ions and reactive oxygen vacancies enriched on the catalyst surface, sound low-temperature reduction, and uniform dispersion. Besides, in situ IR spectroscopy results indicate that the catalytic combustion of CO over manganese-based perovskite catalysts follows the L-H mechanism: the chemisorption of CO and O
2 takes place to produce monodentate carbonates and bicarbonate species, which then decompose to yield CO
2 release. The high-temperature stability test provides evidence that the La
0.9Ce
0.1MnO
3 (with sugar) gives 100% CO conversion and that the activities remain almost unchanged after reaction for 12 h, where the temperature of catalyst bed reaches about 717 °C. The results obtained are helpful to accept this technology on efficient and clean energy utilization in iron and steel industry.
AB - The LaMnO
3, La
0.9Ce
0.1MnO
3 and La
0.9Sr
0.1MnO
3 catalysts are synthesized using sugar agent, and the CO self-sustained combustion is investigated, where the catalytic performance is decided by temperature with CO conversions of 10% (T
10), 50% (T
50), and 90% (T
90). The results show that self-sustaining combustion is successfully realized on the catalyst, and the order of activity decrease is as follows: La
0.9Ce
0.1MnO
3 (with sugar) > La
0.9Sr
0.1MnO
3 (with sugar) > LaMnO
3 (with sugar) > LaMnO
3 (without sugar) > La
0.9Sr
0.1MnO
3 (without sugar) > La
0.9Ce
0.1MnO
3 (without sugar). Combined with the results of XPS, H
2-TPR, O
2-TPD and CO-TPD techniques, the excellent activity of La
0.9Ce
0.1MnO
3 (with sugar) can be attributed to the high content of Mn
4+ ions and reactive oxygen vacancies enriched on the catalyst surface, sound low-temperature reduction, and uniform dispersion. Besides, in situ IR spectroscopy results indicate that the catalytic combustion of CO over manganese-based perovskite catalysts follows the L-H mechanism: the chemisorption of CO and O
2 takes place to produce monodentate carbonates and bicarbonate species, which then decompose to yield CO
2 release. The high-temperature stability test provides evidence that the La
0.9Ce
0.1MnO
3 (with sugar) gives 100% CO conversion and that the activities remain almost unchanged after reaction for 12 h, where the temperature of catalyst bed reaches about 717 °C. The results obtained are helpful to accept this technology on efficient and clean energy utilization in iron and steel industry.
KW - Carbon monoxide
KW - Perovskite
KW - Self-sustained combustion
KW - Stability limit
KW - Sugar agent
UR - http://www.scopus.com/inward/record.url?scp=85101325827&partnerID=8YFLogxK
U2 - 10.1016/j.fuel.2021.120289
DO - 10.1016/j.fuel.2021.120289
M3 - Article
SN - 0016-2361
VL - 292
JO - Fuel
JF - Fuel
M1 - 120289
ER -