ICP-OES yields a Co:Mo molar ratio of 1:6, consistent with the chemical composition of CoMo6O24. Approximately 0.87 POM per Zr6 node is the maximum loading in NU1K after thorough washing. After H2S annealing, the molar ratio of Co to Mo remains 1:6, while S:Mo is 3.87:1. The loading and elemental ratios for the putative CoMo6S24 m-PTM in NU1K are nearly identical to those of the CoMo6O24 n-template, implying that sulfur completely replaces oxygen during H2S annealing.