Abstract
Abstract It has been demonstrated that the isomerisation of maleic acid into fumaric acid in aqueous solution is accerelated by the presence of molecular oxygen, platinum black, palladium black, and various paramagnetic ions, where the isomerisation being probably effectuated by the non-homogeneous magnetic fields of the catalysts in the collision. The isomerisation of maleic acid to fumaric acid in aqueous solution has been kinetically studied both in the presence of paramagnetic oxygen molecules and in the presence of diamagnetic nitrogen molecules, and the energy of activation of the reaction has been calculated. The lower energy of activation in the reaction with oxygen accounts for the catalytic action of the oxygen molecules.
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