What does this equation mean?

The rate-limiting step on a conventional iron catalyst is dissociative chemisorption of the strong nitrogen-nitrogen triple bond — breaking $\mathrm{N_2}$ apart on the metal surface before hydrogenation can proceed. This single fact explains why heterogeneous ammonia catalysis has historically required both high temperature, to overcome the activation barrier for N2 dissociation, and high pressure, to compensate for the resulting unfavorable equilibrium at that temperature. Materials innovation inside the heterogeneous paradigm has targeted exactly this bottleneck rather than abandoning it: ruthenium supported on an electride material with strong electron-donating character was shown to accelerate nitrogen dissociation and suppress hydrogen-induced poisoning of the ruthenium surface, cutting the effective activation energy relative to conventional supported-ruthenium catalysts and operating at markedly milder pressure in laboratory tests [ 2 ] . That is a genuine, measured improvement in intrinsic catalytic kinetics — not, by itself, a claim that the entire Haber-Bosch infrastructure is about to be replaced; commercial ammonia plants still overwhelmingly run iron- or conventional ruthenium-based beds at large scale, and a laboratory-scale kinetic gain does not automatically transfer to plant economics, which are dominated by compression costs, feedstock hydrogen supply, and heat integration across the whole loop.