Dissimilar catalytic trails of nitrate reduction on Cu-modified Pt surface immobilized on H+ conducting solid polymer

作者：Hasnat M A^*; Rashed M A; Ben Aoun S; Uddin S M Nizam; Alam M Saiful; Amertharaj S; Majumder R K; Mohamed N

来源：Journal of Molecular Catalysis A: Chemical , 2014, 383: 243-248.

DOI：10.1016/j.molcata.2013.12.015

• Nitrate
• Nitrite
• Membrane reactor
• Voltammetry
• Mechanism

Cathodic reduction of nitrate ions has been carried out using a sandwich type membrane reactor having a configuration of Pt vertical bar Nafion vertical bar Pt-Cu in absence of any supporting electrolyte. Both Pt and Cu metals are in polycrystalline form on the cathodic surface immobilized on Nafion membrane. The globular Cu particles have a wide range of sizes (70-120nm). During the course of electrolysis in the reactor, the bimetallic Pt-Cu surface reduces NO3- into NH3 and N-2 by means of electrochemical and catalytic hydrogenation reactions, respectively. The electrochemical contribution of nitrate reduction has been investigated in details by using voltammetric and electrolysis techniques. The NO3- ions are electrochemically reduced using a consecutive reaction. On the consecutive way of reduction, the intermediate NO2- and the final product NH3 are generated at -0.74V and -1.1 V versus Ag/AgCl (std. KCl), respectively. The molecular N-2 is generated by means of catalytic reactions followed by electrochemical hydrogen evolution.

• 出版日期2014-3