TY - JOUR
T1 - Improvement in ammonia synthesis activity on ruthenium catalyst using ceria support modified a large amount of cesium promoter
AU - Osozawa, Mami
AU - Hori, Ayane
AU - Fukai, Kosuke
AU - Honma, Tetsuo
AU - Oshima, Kazumasa
AU - Satokawa, Shigeo
N1 - Funding Information:
This work was supported by CREST, Japan Science and Technology Agency (JPMJCR1441). The synchrotron radiation experiments were carried out at BL14B2 of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI, proposal no. 2020A1626). We thank MicrotracBEL for measurements of the CO chemisorption data at low temperature.
Funding Information:
This work was supported by CREST , Japan Science and Technology Agency ( JPMJCR1441 ). The synchrotron radiation experiments were carried out at BL14B2 of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI, proposal no. 2020A1626). We thank MicrotracBEL for measurements of the CO chemisorption data at low temperature.
Publisher Copyright:
© 2021 Hydrogen Energy Publications LLC
PY - 2022/1/12
Y1 - 2022/1/12
N2 - A supported ruthenium catalyst (Ru/Cs+/CeO2) for ammonia synthesis is described which incorporates a large amount of a Cs+ promoter in a porous CeO2 support to enhance the electron donation effect of the alkali promoter on the ruthenium catalyst. Optimization of the Ru and Cs+ promoter contents improves the ammonia synthesis rate to more than 4 times that of the benchmark catalyst (Cs+/Ru/MgO) at 350 °C and 0.1 MPa, and the ammonia synthesis rate is stable for 100 h. Introduction of the Cs+ promoter into the support before the Ru impregnation increases the particle size of the Ru catalyst. Despite a decrease in the number of active sites, the TOF of the catalyst is more than 50 times that of Ru (2 wt%)/CeO2. CO adsorption measurements suggest an electron donating effect by the Cs+ promoter to ruthenium metal. Reaction order analysis indicates this is due to a mitigation of hydrogen poisoning.
AB - A supported ruthenium catalyst (Ru/Cs+/CeO2) for ammonia synthesis is described which incorporates a large amount of a Cs+ promoter in a porous CeO2 support to enhance the electron donation effect of the alkali promoter on the ruthenium catalyst. Optimization of the Ru and Cs+ promoter contents improves the ammonia synthesis rate to more than 4 times that of the benchmark catalyst (Cs+/Ru/MgO) at 350 °C and 0.1 MPa, and the ammonia synthesis rate is stable for 100 h. Introduction of the Cs+ promoter into the support before the Ru impregnation increases the particle size of the Ru catalyst. Despite a decrease in the number of active sites, the TOF of the catalyst is more than 50 times that of Ru (2 wt%)/CeO2. CO adsorption measurements suggest an electron donating effect by the Cs+ promoter to ruthenium metal. Reaction order analysis indicates this is due to a mitigation of hydrogen poisoning.
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U2 - 10.1016/j.ijhydene.2021.10.204
DO - 10.1016/j.ijhydene.2021.10.204
M3 - Article
AN - SCOPUS:85119493080
VL - 47
SP - 2433
EP - 2441
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
SN - 0360-3199
IS - 4
ER -
