The reduction of methylne blue by Sn(II) in acid media is catalyzed by traces of molybdenum. The experimental order found which satisfactorily accounts for all experimental findings indicates that the catalytic action is due to the ability of the Mo(V) to bind with the reagent, forming an intermediate complex. © 1990.
Grases, F., Vila, R., & Amat, E. (1990). Kinetics of the reduction of methylene blue by Sn(II) catalyzed by molybdenum. Journal of Molecular Catalysis, 59(1), 17–21. https://doi.org/10.1016/0304-5102(90)85083-T