Theoretical determination of proton affinity differences in zeolites

Experimental and Theoretical Studies of the Proton Affinity of Fluoroboroxine*

The proton affinity of fluoroboroxine, FBO, is explored both experimentally and theoretically. Results of selected-ion flow tube measurements are reported for proton transfer reactions which place the proton affinity (PA) of FBO between those of ethylene and acetylene, PA(C2H4) > PA(FB0) > PA(C,H,), with PA(FB0) equal to 158 + 6kcalmoll’. FBOH’ is produced from the reaction of BF: with H,O and ...

Persistent methylbenzenium ions in protonated zeolites: the required proton affinity of the guest hydrocarbon.

Proton Adsorption Selectivity of Zeolites in Aqueous Media: Effect of Si/Al Ratio of Zeolites.

In addition to their well-known uses as catalysts, zeolites are utilized to adsorb and remove various cations from aqueous system. The adsorption of the cations is ascribed to the negative charge of zeolites derived from isomorphous substitution of Si by Al. The amount of Na+ adsorption on 4A, X, Y, Na-P1 and mordenite type zeolites were determined in aqueous media, in a two-cation (Na+ and H+)...

Proton Adsorption Selectivity of Zeolites in Aqueous Media: Effect of Exchangeable Cation Species of Zeolites

The saturation of negative charges of zeolites by specific cations to modify their physicochemical and catalytic properties has broadened the applications of zeolites. The adsorption behavior of H+ to Li+, Na+, K+, Rb+ and Cs+-saturated Linde-type A, Na-P1, mordenite, X type and Y type zeolites was evaluated at different pH-pM, where pH-pM is equal to log {(M+)/(H+)} and M+ represents either Li...

determination of maximal singularity free zones in the workspace of parallel manipulator

due to the limiting workspace of parallel manipulator and regarding to finding the trajectory planning of singularity free at workspace is difficult, so finding a best solution that can develop a technique to determine the singularity-free zones in the workspace of parallel manipulators is highly important. in this thesis a simple and new technique are presented to determine the maximal singula...