Interaction of benzene with hydroxyl groups in zeolites: A FTIR study of C6H6 and C6D6 adsorption on H-ZSM-5 and D-ZSM-5

FTIR Evidence of Different Bonding of Methane to OH Groups on H–ZSM-5, HY, and SiO2

“…The OD bands are shifted to a lesser extent as expected from the OH−OD isotopic shift factor of the isolated groups. Similar phenomena has been recently described with other molecular probes 39,44 and attributed to the lower acidity of the OD groups as compared to the OH. A careful inspection of the spectra presented in Figure 1B indicates the same effect is also valid for the shifted silanol groups.…”

Understanding the suppressive role of catalytically active Pt–TiO2 interfacial sites of supported metal catalysts towards complete oxidation of toluene

“…Aer the adsorption of toluene, strong negative peaks appear at ∼3700 cm −1 , which are attributed to the consumption of OH at the interfacial TiO 2 sites. [61][62][63] Meanwhile, two sets of bands appear at 3600 cm −1 and 1495 cm −1 , and their intensities increase with adsorption time. These two bands are assigned to the O-H stretching vibration of adsorbed water [61][62][63] and the benzene breathing vibration of adsorbed toluene species, 54,[64][65][66] respectively.…”

“…[61][62][63] Meanwhile, two sets of bands appear at 3600 cm −1 and 1495 cm −1 , and their intensities increase with adsorption time. These two bands are assigned to the O-H stretching vibration of adsorbed water [61][62][63] and the benzene breathing vibration of adsorbed toluene species, 54,[64][65][66] respectively. These results mean that toluene would react with the OH species at the interfacial TiO 2 sites, leading to the formation of water and partially dehydrogenated toluene, which is very consistent with the TPD results.…”

Aromatic–hydroxyl interaction of an alpha-aryl ether lignin model-compound on SBA-15, present at pyrolysis temperatures

“…In general, the interaction between surface hydroxyls and electron-donating adsorbates leads to a shift of the sharp free hydroxyl band to lower wavenumbers. [31][32][33][34][35] The strength of the aromatic-hydroxyl interaction with the toluene moiety is reflected in the degree of the redshift in wavenumbers of the hydroxyl infrared absorption band (discussed in Section S9 of the ESI †). 33 Similar hydroxyl redshifts have been observed when anisole and phenol molecules hydrogen bond with hydroxyls on oxide surfaces: whether through the aromatic ring, the organic molecule's oxygen, or the alcohol hydrogen.…”