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A two-dimensional 13 C-NMR chemical-shift-chemical-shift exchange experiment is described which permits the measurement of solid state 13 C resonance frequencies at two different sample orientations. This technique provides a method for probing the principal values of multiple 13 C chemical shift tensors in overlapping powder patterns as well as the orientational...
1 3 C NMR and FTIR analyses have been employed to follow the evolution of chemical structure in relation to porosity development, as a function of heat treatment temperature (HTT), for activated carbons produced from white oak by phosphoric acid activation. The chemical changes affected by acid treatment at low HTT are: by 50°C there is significant alteration of the lignin structure; by 100°C...
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