Ammonia Formation from NO Reaction with Surface Hydroxyls on Rutile TiO2(110)-1 x 1
Kim, B; Kay, BD; Dohnalek, Z; Kim, YuK
| HERO ID | 2841933 |
|---|---|
| In Press | No |
| Year | 2015 |
| Title | Ammonia Formation from NO Reaction with Surface Hydroxyls on Rutile TiO2(110)-1 x 1 |
| Authors | Kim, B; Kay, BD; Dohnalek, Z; Kim, YuK |
| Journal | Journal of Physical Chemistry C |
| Volume | 119 |
| Issue | 2 |
| Page Numbers | 1130-1135 |
| Abstract | The reaction of NO with the hydroxylated rutile TiO2(110)-1 x 1 surface (h-TiO2) was investigated as a function of NO coverage using temperature-programmed desorption. Our results show that NO reaction with h-TiO2 leads to formation of NH3, which is observed to desorb at similar to 400 K. Interestingly, the amount of NH3 produced depends nonlinearly on the dose of NO. The yield increases up to a saturation value of similar to 1.3 x 10 (13) NH3/cm(2) at a NO dose of 5 x 10(-13) NO/cm(2), but subsequently decreases at higher NO doses. Preadsorbed H2O is found to have a negligible effect on the NH3 desorption yield. Additionally, no NH3 is formed in the absence of surface hydroxyls (HObs) upon coadsorption of NO and (HO)-O-2 on a stoichiometric TiO2(110) (s-TiO2(110)). On the basis of these observations, we conclude that nitrogen from NO has a strong preference to react with HObs on the bridge-bonded oxygen rows (but not with H2O) to form NH3. The absolute NH3 yield is limited by competing reactions of HOb species with titanium-bound oxygen adatoms to form H2O. Our results provide new mechanistic insight about the interactions of NO with hydroxyl groups on TiO2(110). |
| Doi | 10.1021/jp5109619 |
| Wosid | WOS:000348094000030 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |