NMR Techniques in Catalysis Bell by Alexis T. Bell

By Alexis T. Bell

This quantity presents an summary of the functions of recent solid-state nuclear magnetic resonance (NMR) innovations to the learn of catalysts, catalytic techniques, species adsorbed on catalysts and platforms appropriate to heterogeneous catalysis. It characterizes the constitution of catalytic fabrics and surfaces.

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313"~li . ENE per 250 mg figure 27 Effects of p-xylene and temperature on the crystal symmetry of ZSM-5. (From Ref. ) 373 K I I -105 figure 28 I I I PPM from TMS ~·'si MAS NMR spectra of zeolite ZSM-ll at 263 and 373 K as indicated. (From Ref. ) 48 Fyje et al. • ~ T, ~ I -106 • - I f- -124 f- -- 122 - -120 - 118 1-- 116 ~ f- T2TJ '- -114 f- G» T - 116 - 1 12 1- -110 1T2 :... -108 I -110 I I -114 I I -118 I I - 122 I PPM PPtv1 Figure 31 Contour and stacked plots of a two-dimensional COSY experiment on ZSM-39 at 373 K using a modified COSY pulse sequence with fixed evolution delays.

34). Most importantly, doublet splittings are observed for the cross-peaks in F 2 (the limited resolution in F 1 precludes their observation in this dimension). Figure 35 shows plots of rows from this two-dimensional spectrum corresponding to the maxima in the diagonal peaks where the doublet structures are clearly observable. 0 PPM Figure 34 Contour plot of a COSY experiment on ZSM-12 with projection in F2 . The same conditions as those in Fig. 33 were used except that 80 scans were taken in each experiment.

J9j ~------------~ (b) 373 J53 ~,() 333 /; ~~ ~ + 4 JJ. ,p-~ENE per 250 ~9 (a) 100 0 ,i lj "" 80 ~ ~ 60 ~ 393\ 373~ /'; ~ ~ ~ ~ ~ 40 ; 353 ~ : ... ~ / ~. : / ~. : '. ·. 313"~li . ENE per 250 mg figure 27 Effects of p-xylene and temperature on the crystal symmetry of ZSM-5. (From Ref. ) 373 K I I -105 figure 28 I I I PPM from TMS ~·'si MAS NMR spectra of zeolite ZSM-ll at 263 and 373 K as indicated. (From Ref. ) 48 Fyje et al. • ~ T, ~ I -106 • - I f- -124 f- -- 122 - -120 - 118 1-- 116 ~ f- T2TJ '- -114 f- G» T - 116 - 1 12 1- -110 1T2 :...

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