Where can I find typical values of the Arrhenius activation energy for arbitrary reactions? I only want to have orders of magnitude estimates, but so far I have not been able to find any good resource that lists activation energies for different types of reactions.

There are tons of papers in which people determine precise values for very specific reactions, but I am looking for a kind of database or reference that has a large collection of values. In particular, those for biochemical reactions would be useful to have.

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    $\begingroup$ You can roughly estimate based on the expected half-life and the Eyring equation. See: chemistry.stackexchange.com/questions/61602/… $\endgroup$ – Zhe Apr 5 '17 at 21:25
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    $\begingroup$ That is because there are no typical values, and this is why only individual values are quoted. Fast reactions have small activation energies, slow ones large ones, but what is fast, slow and small or large is subjective. What is true, however, is that because of the exponential dependence of rate constants (1/rate const = lifetime) relatively small differences in activation energy cause a huge difference in reaction lifetime as pointed out by @Zhe. $\endgroup$ – porphyrin Apr 6 '17 at 14:35

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