The effects of a sub-nanometer grain boundary in all-silica chabazite (CHA) zeolite membranes on their permeation properties were investigated by non-equilibrium molecular dynamics (NEMD). results indicated that at the total pressure 0.5 MPa, 298 K, CO2 selectivity toward CH4 drastically increased due to presence region inside membrane. This was consequence selective condensation boundary. calc...

This study investigates NO adsorption on Pd-exchanged chabazite (Pd/H-CHA), a promising passive NOx adsorber (PNA) for capturing cold-start emissions of gasoline- and diesel-powered vehicles. Temperature-programed desorption (TPD) IR spectroscopy are combined with theoretical calculations to elucidate how where is stored, water O2 affect this process. Pd/H-CHA produces two TPD features, around ...

FeIII-containing aluminosilicate zeolites are present in cement-relevant and natural environments. Although FeIII is known to occur framework tetrahedral sites where it substitutes isomorphically AlIIIO4 or extra-framework octahedral as free Fe(H2O)63+, the structural incorporation process of into different little known. We aim discern feasible pathways using hydrothermal synthesis methods sync...

Zeolites have been used in agriculture since the 1960s, due to effectiveness of these crystalline microporous solids as soil amendments for plant growth, their cation exchange capacity (CEC) and slow-release fertilizer properties. Most work on fertilizers has focused natural Clinoptilolite, Phillipsite Chabazite. The aim this study was synthesize clinoptilolite type zeolite-enriched amendments....

The design of efficient separation and catalytic processes in nanoporous adsorbents requires fine tuning gas adsorption their porosity. Here, using a large set Si-rich zeolites (silicalite-1, Beta, chabazite, ITQ-13), we report on an experimental study vapor showing the pivotal role hydroxyl concentration. By studying water methanol assisted with situ IR 29Si NMR measurements, find that switche...

The influence of the nature of the cation on the interaction of the silicoaluminophosphate SAPO-34 with small hydrocarbons (ethane, ethylene, acetylene, propane, propylene) is investigated using periodic density-functional theory calculations including a semi-empirical dispersion correction (DFT-D). Initial calculations are used to evaluate which of the guest-accessible cation sites in the chab...