Liang-Wei Lan1*, Yao-Jui Chan1, Chien-Cheng Kuo1
1Department of Physics, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
* presenting author:藍梁瑋,
Trimerized propanal has widely used on industrial application. However, the trimerization usually needs acid as catalyst which causes damage to environment. Recently, some researches have revealed that propanal(C2H5CHO) spontaneously trimerizes to 2,4,6-triethyl-1,3,5-trioxane ring only on Au(110) and Au(531) surface at 180K[1]. The trimerization reaction was proposed that it takes place on specific sites of gold surface but still not be clarified. If what kinds of sites this catalytic reaction prefer is known, we can realize and complete the mechanism of the catalytic reaction on Au(110) surface. In order to figure out this problem, scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED) has been used to investigate the gold surface after the deposition of propanal. Ensure the reaction indeed occur at special sites on Au(110) surface, residual gas analyzer(RGA) were applied to monitor the changes of molecule mass after catalytic reaction. From LEED pattern, the contrast of spots provided us a clue. By comparing the results of LEED and STM, the possible absorption sites of propanal are proposed. More details will be discussed in the talk.

[1] S. M. Wu, C. M. Chiang, J. Phys. Chem. Lett. 2011, 2, 2337–2340

Keywords: Au(110), Propanal, catalysis