Preferential occupation of xenon in zeolite MCM-22 as revealed by (super 129)Xe NMR spectroscopy

Article Abstract:

Adsorption of xenon on zeolite MCM-22, a zeolite containing two separate pore systems is investigated with (super 129)Xe NMR spectroscopy as a function of Xe loadings over a wide range of temperatures (120-350 K). NMR results suggest that Xe atoms are preferentially adsorbed in the supercage of the zeolite at low Xe pressures, while Xe atoms can penetrate into the two-dimensional sinusoidal channels at high Xe pressure.

Industrial Gas Manufacturing, Industrial gases, Xenon, Usage, Observations, Nuclear magnetic resonance spectroscopy, NMR spectroscopy

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Heterogeneous versus homogeneous nucleation and growth of zeolite A

Article Abstract:

The effectiveness of the addition of nanoparticles of various materials to act as substrates for zeolite A nucleation and growth is investigated in an attempt to obtain submicron zeolite A crystals. It is observed that though the free energy change for heterogeneous nucleation is less than for homogeneous nucleation, steric factors lead to a lower growth rate.

Nucleation, Nucleation (Chemistry)

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Heterogeneous nonclassical carbonyls stabilized in Cu(I)- and Ag(I)-ZSM-5 zeolites: thermodynamic and spectroscopic features

Article Abstract:

A study was conducted to investigate the room temperature interaction of CO with coordinatively unsaturated Cu(I) and Ag(I) cations hosted in ZSM-5 zeolites. The result confirmed that CO binds to the d-block metal cations through a chemical interaction which involves an enthalpy change of ~120 and 100 kj/mol for Cu(I) and Ag(I) sites respectively.

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