Physikalische Chemie - Direktor: Prof. Dr. Martin Wolf
Department Seminar
Host: T. Kumagai

Tuesday, October 30, 2018, 11:10 am
PC Seminar Room, G 2.06, Faradayweg 4
Prof. Jun Yoshinobu
Functional Materials, Institute for Solid State Physics, University of Tokyo
Adsorption, reaction and hydrogenation of carbon dioxide and formic acid on the Cu model catalysts
Although the interaction between carbon dioxide (CO2) and solid surfaces is classified as weak adsorption (physisorption) [1, 2], it is possible to synthesize several chemicals such as formic acid, methanol, methane, etc. from CO2 using catalysts [3].
In recent years, we have been studying the interaction between CO2 and Cu(111) and Cu(997) surfaces [4] and the interaction and chemistry of formic acid on Cu(111) surface [5] in ultrahigh vacuum (UHV), by means of temperature programmed desorption (TPD), infrared reflection absorption spectroscopy (IRAS), photoelectron spectroscopy, etc. The collaboration between our experimental quantitative analysis and the theoretical study based on first principles calculations [6] has clearly elucidated that the van der Waals interaction plays a vital role in surface chemistry of CO2 and formic acid.
In order to elucidate the roles of co-catalyst and defect, several model catalysts were prepared by depositing Zn on Cu(111) and Cu(997) surfaces [7], and the surface chemistry of formic acid in UHV [8] and the interaction between CO2 and H2 under near ambient pressure condition [9] were investigated on these prepared Cu model catalysts.
In the talk, I will present that the van der Waals interaction plays an important role in adsorption and reaction of CO2 [6] and formic acid [5] on metal surfaces, the step site activates the decomposition of formic acid into formate species and Zn atoms stabilize the adsorbed formate species on Cu surfaces [8]. The hydrogenation of CO2 on Zn-Cu model catalysts in near-ambient pressure condition will be discussed [10].
[1] H.-J. Freund and M. Roberts, Surf. Sci. Rep. 25 (1996) 225..
[2] U. Burghaus, Prog. Surf. Sci. 89 (2014) 161..
[3] G.A. Olah et al., “Beyond oil and gas: the methanol economy” (WILEY-VCH, Weinheim, 2009).
[4] T. Koitaya et al., J. Chem. Phys. 144 (2016) 054703.
[5] Y. Shiozawa et al., J. Chem. Phys. 143 (2015) 234707.
[6] F. Muttaqien et al., J. Chem. Phys. 147 (2017) 094702.
[7] T. Koitaya et al., Surf. Sci. 663 (2017) 1.
[8] Y. Shiozawa, Ph.D thesis in Univ. of Tokyo (2017); Y. Shiozawa et al., in preparation.
[9] T. Koitaya et al., Topics in Catalysis, 59 (2016) 526.
[10] T. Koitaya et al., in preparation (2018)..