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Reflections on applications of NMR in heterogeneous catalysis and surface chemistry (1996)

Packer, K. J.

Springer

Topics in catalysis 3 (1996), S. 249-254

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ISSN: 1572-9028

Keywords: NMR characterisation ; heterogeneous catalysts ; surface chemistry

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract The use of NMR to characterise heterogeneous catalytic systems and processes is assessed, critically, in overview. The generally wide scope and applicability of NMR is placed in the context of the constraints of NMR experimental requirements and the general goal of studying catalytic systems under conditions relevant to their actual use. In particular, the issues of sensitivity, resolution and dynamic processes in NMR are considered alongside the aims of surface selectivity, sample environment control and the desirability of associated characterisation of the catalytic systems by methods complementary to NMR.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02431187

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NMR measurements and numerical simulation of fluid transport in porous solids (1997)

Tessier, J. J. ; Packer, K. J. ; Thovert, J.-F. ; [et al.]

Hoboken, NJ : Wiley-Blackwell

AIChE Journal 43 (1997), S. 1653-1661

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ISSN: 0001-1541

Keywords: Chemistry ; Chemical Engineering

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology

Notes: Pulsed magnetic field gradient stimulated echo NMR measurements are performed for diffusion and flow of an aqueous phase both within a sample of packed spherical beads and within a 25% porosity Fontainebleau sandstone. The stimulated echo dependence on the gradient pulse area q is used to derive the displacement probability distributions PΔ(X) for fixed observation times Δ. The shape of PΔ(X) as a function of Δ is simulated for computer-generated porous media, and a good agreement is obtained between the experimental NMR data and the simulations.

Additional Material: 10 Ill.