Molecular and dissociative chemisorption and condensation of SO2 on Cu(111)

The chemisorption of SO2 on the Cu/Au(111) surface: Interplay between ensemble and electronic effects

“…6 indicate that there was no cleavage of S-O bonds on the bimetallic surface. From previous studies it is known that SO 2 easily dissociates on Cu(1 0 0) and Cu(1 1 1) [13][14][15][16][17]32,33]. Comparing to photoemission data reported for SO 2 on pure Au(1 1 1) [18], we find similar results.…”

“…7 and 8, unlike the cases of SO 2 /Cu(1 0 0) and SO 2 /Cu(1 1 1) mentioned above [13][14][15][16][17]32,33]. In Fig.…”

“…7 displays S 2p and O 1s core level spectra acquired after dosing SO 2 at 100 K (followed by heating to the indicated temperatures) on Au(1 1 1) pre-deposited with 0.4 ML of Cu at 100 K. One can see that the S 2p and O 1s signals still remained by 350 K and they disappeared by 400 K. As we will see below, the position of the S 2p features at room temperature denotes the presence of chemisorbed SO 2 and no signal is seen in the 164-161 eV region where the features for chemisorbed S are expected [3,5,6]. The Cu 0.4 /Au(1 1 1) surface binds SO 2 more strongly than Au(1 1 1) [18] but more weakly than Cu(1 0 0) or Cu(1 1 1) [13][14][15][16][17]32,33]. Fig.…”

“…As shown in Fig. 4 [13][14][15][16][17] or other metals [35,37,38], where SO 2 readily dissociates at the raised temperature. However, Cu/Au(1 1 1) behaves differently from the pure metal.…”

“…2CO 2 + S n [10][11][12]. From previous studies it is known that SO 2 easily dissociates on Cu(1 0 0) and Cu(1 1 1) [13][14][15][16][17]. On these surfaces, the molecule adsorbs intact at 100 K, and undergoes decomposition at temperatures between 200 and 300 K. The final products of the decomposition process are S and O adatoms with SO 3 as an intermediate.…”