In situ thermogravimetry in an infrared spectrometer: an answer to quantitative spectroscopy of adsorbed species on heterogeneous catalysts

The Influence of Si/Al Ratio on the Distribution of OH Groups in Zeolites with MWW Topology

“…Pyridine was adsorbed in MCM-22/10 containing only small amount of extraframework Lewis sites, which were saturated during the adsorption of the first pyridine dose. This spectrum was consequently not used for the calculation of the absorption coefficient, according to the procedure described in details in one of our previous publications [31]. The value of the PyH ?…”

On the enhancing effect of Ce in Pd-MOR catalysts for NOx CH4-SCR: A structure-reactivity study

“…The quantification of total number of Brønsted acid sites (BAS) and Lewis acid sites (LAS) was performed through the integration of IR bands around 1545 and 1455 cm -1 , respectively, using molar extinction coefficients reported elsewhere [36]. Although the data from reference [36] are frequently quoted in the literature, according to our AGIR studies [37], their use may lead to a significant overestimate of the concentration of acid sites since the sample mass was not monitored during the pyridine adsorption in reference [36].…”

In situ and post-synthesis control of physicochemical properties of FER-type crystals

“…The amount of pyridine adsorbed on Lewis acid sites was determined from the area of the 1450 cm À1 band using the molar absorption coefficient reported by Vimont et al [32]. The amount of pyridine adsorbed on Brønsted acid sites was determined from the area of the 1545 cm À1 band using the molar absorption coefficient reported by Thibault-Starzyk et al [33]. The amount of bridged hydroxyls (m(OH) band at 3602 cm À1 ) and acetonitrile (CD 3 CN) adsorbed on Lewis and Brønsted acid sites was determined using the molar absorption coefficients reported by Wichterlova et al [34].…”