Synergistic effect in heterogeneously catalyzed reduction of U(VI) and Np(V) and decomposition of hydrazine and oxalic acid with bimetallic Pt-Ru catalysts

Catalytic reactions of oxalic acid degradation with Pt/SiO2 as a catalyst in nitric acid solutions

“…Various methods of oxalic acid destruction, such as the addition of oxidizing agents, 10,11 electrolytic oxidation 12,13 and using a catalyst in nitrate solution, [6][7][8][14][15][16][17][18][19][20] have been developed to replace the method for oxalic acid oxidized by KMnO 4 . H 2 O 2 is the most popular reagent for the addition of oxidizing agents in this approach and has the advantage of not importing additional impurity ions into the reaction system, but its drawback is that oxalic acid degradation to limiting oxalic acid concentration is excessively prolonged due to the low reaction rate.…”

“…In addition, oxalic acid degradation to limiting oxalic acid concentration by this method is lengthy, and the prolonged reaction process at elevated temperatures causes severe erosion damage to the alloy reactor. In heterogeneous catalysis, using supported platinum as a catalyst is common, [15][16][17][18][19][20] and this method shows the characteristics of rapid and stable oxalic acid degradation without an induction period. Moreover, the catalyst is recyclable without introducing impurity ions.…”

“…As a result, this method is one of the preferred alternatives to the method currently used for oxalic acid oxidation by KMnO 4 . Pt/ SiO 2 is commonly used as a catalyst for nitrate degradation in solution, [15][16][17][18][19][20][21] and the oxalic acid degradation with Pt/SiO 2 as a catalyst only is carried out by a simple exploratory process. 19,20 The catalytic processes and mechanisms of oxalic acid degradation are still poorly understood.…”

“…Pt/ SiO 2 is commonly used as a catalyst for nitrate degradation in solution, [15][16][17][18][19][20][21] and the oxalic acid degradation with Pt/SiO 2 as a catalyst only is carried out by a simple exploratory process. 19,20 The catalytic processes and mechanisms of oxalic acid degradation are still poorly understood. Thus, the present study focused on the effects of H + /NO 3 − and nitrous acid on oxalic acid degradation, in order to provide insight into the interaction of the catalyst with the reactants.…”