Effects of Treatment Conditions on Pd Speciation in CHA and Beta Zeolites for Passive NO Adsorption.

The structure and evolution of Pd species in Pd-exchanged zeolite materials intended for use as passive NO adsorbers were examined under various pretreatment conditions. Using in situ CO-diffuse reflectance infrared spectroscopy, Pd structures were characterized after 500 °C pretreatments in inert (Ar), water (1-2% HO in Ar), oxidizing (air), and reducing (H, CO) atmospheres. Two zeolites of similar Si/Al ratios but different framework topologies (Beta, CHA) were found to show different distributions of Pd species, depending on the reducing agent used.

Direct analysis in real time mass spectrometry (DART-MS) of ionic liquids.

Direct analysis in real time mass spectrometry (DART-MS) was used to analyze ionic liquids (ILs) containing either imidazolium or phosphonium cations combined with different types of inorganic and organic anions. Ionic liquids were directly inserted into the ionization source using a glass probe without dissolution into organic solvents. Mass spectra of the ILs were collected in both positive and negative mode with a linear ion-trap instrument.