Characterization of catalyst acidity by microcalorimetry and temperature-programmed desorption

Desorption kinetics and interaction of Xe with single-wall carbon nanotube bundles

“…We will illustrate that this need not be the case for thermal desorption from porous samples, where diffusion within the sample must be considered. However, standard models for differential thermal analysis of solid-gas reactions [17] or for the analysis of thermal desorption, from zeolites for example [18,19,20] do not account for concentration gradients. We will develop in the following a simple one-dimensional coupled desorption-diffusion (CDD) model which allows the calculation of the desorption rate from porous samples.…”

General aspects of zeolite acidity characterization

“…These results show how important it is to control the experimental conditions, and how difficult it is to determine intrinsic desorption rates from TPD measurements of microporous materials. Sharma et al [133] measured the TPD profiles of H-ZSM-5 with different carrier flows, and also observed variations in peak positions not ascribable to acidic strength. Some technical details must be considered in the design of TPD equipment [130].…”

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

“…H-ZSM-5 is often considered as a typical example of a zeolite having one family of bridging hydroxyls [11,46,47]. However, some studies dealing with benzene adsorption suggest heterogeneity of the Brønsted sites in ZSM-5.…”