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Highly Dispersed Zn Sites on ZrO2 by Flame Spray Pyrolysis for CO2 Hydrogenation to Methanol

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Title: Highly Dispersed Zn Sites on ZrO2 by Flame Spray Pyrolysis for CO2 Hydrogenation to Methanol
Authors: Fujiwara, Kakeru Browse this author →KAKEN DB
Akutsu, Taiki Browse this author
Nishijima, Masahiko Browse this author
Tada, Shohei Browse this author →KAKEN DB
Keywords: Methanol synthesis
Flame synthesis
Solid solution
Zn substitution
Tetragonal ZrO2
Issue Date: Nov-2023
Publisher: Springer
Journal Title: Topics in Catalysis
Volume: 66
Issue: 19-20
Start Page: 1492
End Page: 1502
Publisher DOI: 10.1007/s11244-023-01803-w
Abstract: In this study, we synthesized xZnO-ZrO2 (x = 14-40 at%) by flame spray pyrolysis under a lean-fuel condition. The optimal ZnO content was investigated to obtain a ZnO-ZrO2 solid solution with high specific surface area for CO2-to-methanol hydrogenation. The Zn species in ZnO-ZrO2 were highly dispersed and hexagonal ZnO was not detected by X-ray diffraction (XRD). After heating the particles in Ar at 400 degrees C for 3 h, hexagonal ZnO particles were observed at x = 40 at%, while below x = 28 at%, the Zn species remained high dispersion state. A fraction of the Zn species was substituted into the bulk of the ZrO2 particles, as evidenced by the shift of the ZrO2 (101) peak in the XRD patterns. The elemental mapping of Zn and Zr in 28 at% ZnO-ZrO2 showed that the Zn species on the surface were uniformly distributed. The presence of partially reduced Zrd(delta+) state (delta < 4) was confirmed by X-ray photoelectron spectroscopy. The Zrd(delta+) state in the ZnO-ZrO2 particles was prominent when ZnO content was below 28 at%. The catalytic activity of 28 at% ZnO-ZrO2 for CO2-to-methanol hydrogenation was higher than that of 40 at% ZnO-ZrO2. At 300 degrees C and 1.0 MPa, the CO2 conversion and the selectivity to methanol over 28 at% ZnO-ZrO2 were 9 and 48%, respectively, resulting in the high yield of methanol (4.3%).
Rights: This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at:
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 多田 昌平

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