Haag and co-workers measured the cracking rate of n-hexane by HZSM-5 relative to a high-surface-area catalyst under identical experimental conditions. The dependence of the rate on the Al:Si ratio and on the intensity of the signal due to tetrahedral Alsitesin the ²⁷Alsolid state NMR are shown in the figures below. State what you can conclude from the linear dependence of activity on both the Al:Si ratio and the NMR signal from tetrahedral sites.

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1000 relative cracking activity 100 10 0.1 0.00001 0.001 Al:Si ratio 0.1 relative cracking activity 250 200 150 100 50 0 50 100 tetrahedral 27 Al NMR signal