The adsorption and reactions of methyl iodide on powdered Ag/TiO2

Methanol carbonylation catalyzed by TiO2–supported gold: An in-situ infrared spectroscopic investigation

“…This result is also consistent with our IR data showing that part of the initially present cationic gold was reduced in the presence of flowing CO. Interestingly, the TPR data characterizing the sample after it had been exposed to the flowing mixture of CO, methanol and methyl iodide show that the area under the low-temperature peak increased in intensity (Figure 10d), indicating that the presence of methyl iodide led to the reoxidation of part of the gold that had been reduced in the presence of flowing CO. (Figures 7 and 8, dark gray). These bands are assigned to the  aCH3 ,  sCH3 ,  aCH3 and  sCH3 vibration modes, respectively [59,60]. When a TiO 2 -supported gold sample was treated in He saturated with methyl iodide, the same bands appeared (Supplementary Data), thus confirming that they are indeed related to the presence of methyl iodide.…”

A surface science perspective on TiO2 photocatalysis

“…As with other noble metals, supported Ag nanoparticles are believed to promote charge separation and electron trapping [150][151][152]551,659,1233,1236,1238,[1241][1242][1243][1244][1245][1246]1251,[1253][1254][1255], and to facilitate surface chemistry not seen on bare TiO 2 surfaces [1088,1114,1166,1215,1233,1234,[1237][1238][1239]1241,1248]. As an example, Kominami et al [1233] found that among TiO 2 -supported noble metals, Ag and Cu were best at assisting nitrate photoreduction to ammonia because these metals displayed the best activity for H + reduction by photoexcited electrons trapped at the noble metal particles.…”

Mixed phase titania nanocomposite codoped with metallic silver and vanadium oxide: New efficient photocatalyst for dye degradation

“…1d) shows a narrow peak with a BE of 529.6 eV and slight asymmetry, corresponding to bulk oxygen bonded on TiO 2 or vanadium oxide. A little shift of the BEs of Ti and O are attributed to the polarization effect due to the incorporation of both V and Ag species within TiO 2 matrix [30].…”