Bronsted and Lewis acid sites in dealuminated ZSM-12 and beta zeolites characterized by NH3-STPD, FT-IR, and MAS NMR spectroscopy

Article Abstract:

The acidity characteristics of dealuminated ZSM-12 and beta zeolites are studied using nuclear magnetic resonance, NH3-stepwise temperature-programmed desorption and infrared spectroscopy in a wide range of Si/Al ratios.

Chemistry, Physical and theoretical, Physical chemistry, Organometallic compounds

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Resonant diffusion of normal alkanes in zeolites: effect of the zeolite structure and alkane molecule vibrations

Article Abstract:

A theoretical study was conducted to analyze the diffusion of normal alkanes in one-dimensional zeolites based on the stochastic equation formalism. The theory supports the diffusion of a single normal alkane molecule in zeolites and the computation of the tracer diffusion constant. Experimental results indicated that diffusion was not resonant in zeolites supporting no periodic variance of the pore cross-sectional area along the length of the channel.

Molecular dynamics, Alkanes, Diffusion, Diffusion (Physics)

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Theoretical models for the rate of NO decomposition over copper-exchanged zeolites

Article Abstract:

A study was conducted to characterize the catalytic influence of copper-exchange zeolites for the decomposition of nitric oxide. Experimental results indicated that an electron transfer from copper ions to the nitric oxide molecule weakened the interaction between the nitrogen and oxygen atoms. In addition, there was consequent breakdown of the N-O bond under the influence of either the zeolite or another nitric oxide molecule.

Nitric oxide, Copper, Catalysis

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