Study on the kinetics of the adsorption and desorption of NH on Fe/HBEA zeolite.

In this work, a Fe/HBEA zeolite (Si/Al: 12.5), representing an effective catalyst for the NH-SCR process, was physico-chemically characterized and investigated regarding the kinetics of the adsorption and desorption of NH. The sample was evaluated by N physisorption, Fe Möessbauer and DRUV-Vis spectroscopy, while the kinetics was investigated by temperature-programmed desorption of NH (TPD) including different adsorption temperatures.

Synthesis and stability of single-phase chalcopyrite - a potential reference material for key investigations in chemistry and metallurgical engineering.

Single-phase chalcopyrite (CuFeS) is a key reference material in the development of new metallurgical processes to ensure a reliable copper supply. Here, we report on the successful synthesis of single-phase chalcopyrite and its phase behaviour. We further rationalise different opinions previously expressed in the literature.

Kinetic modeling of the adsorption and desorption of CO2 on α-Fe2O3.

The present paper addresses the interaction of CO2 with polycrystalline α-Fe2O3 revealing considerable catalytic activity in CO oxidation to yield CO2. The mechanism of adsorption and desorption of CO2 was investigated by diffuse reflectance infrared fourier transform spectroscopy (DRIFTS), while the kinetics was examined by temperature-programmed desorption (CO2-TPD). For numeric modeling as well as simulation of the surface coverage, an elementary kinetic mean field model was constructed using Arrhenius-based rate expressions.

Salen-based metal-organic frameworks of nickel and the lanthanides.

A well defined salen-nickel complex was introduced as "metalloligand" in lanthanide-based MOFs. By using this strategy unique structures, in which the salen-nickel unit acts as flexible strut, were obtained. The shape of the network is strongly influenced by the ion radius of the lanthanide element.

On the local sensitivity of different IR techniques: Ba species relevant in NO(x) storage-reduction.

IR spectroscopy is widely used to elucidate reaction mechanisms in NO(x) storage and reduction (NSR). Observed band positions and assignments of vibrational modes, however, differ remarkably among the various investigations. We report an IR study of barium species relevant in NSR, aiming to clarify the source of the reported discrepancies and different surface and bulk sensitivity of various IR measurement configurations.