화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.28, 131-137, August, 2015
DOI10.1016/j.jiec.2015.02.008  Export Citation
Lean Cu-immobilized Pt and Pd films/.H+ Conducting Membrane Assemblies: Relative Electrocatalytic Nitrate Reduction Activities
Mohammad A. Hasnat†, Sami Ben Aoun1, †, Mohammed M. Rahman2, Abdullah M. Asiri2, and Norita Mohamed3
  • Department of Chemistry, School of Physical Sciences, Shahjalal University of Science and Technology, Sylhet 3100, Bangladesh
  • 1Department of Chemistry, Faculty of Science, Taibah University, PO Box 30002, Al-Madinah Al-Munawarah, Saudi Arabia
  • 2Center of Excellence for Advanced Material Research (CEAMR) and Chemistry Department, Faculty of Science, King Abdulaziz University, PO Box 80203, Jeddah 21589, Saudi Arabia
  • 3School of Chemical Sciences, Universiti Sains Malaysia, 11800 Minden, Penang, Malaysia
E-mail:,
Asymmetric reactors having the configuration (PtjNafionjM.Cu, M = Pt, Pd) were designed and applied to the electrocatalytic nitrate reduction reaction (NRR) with no supporting electrolyte. The electrochemically.fabricated Cu.M (M = Pt, Pd) catalysts showed a highly-efficient catalytic activity by effectively reducing more than ca. 99% of nitrate ions, under static-reactor conditions, with first-order rate constants of ca. 0.040 min-1 and ca. 0.057 min-1 for Cu-Pt and Cu-Pd, respectively. Similar reactivity trends were observed under flow mode irrespective of flow rates while NRR rates were predominantly controlled by diffusion-limited mass-transfer. A maximum of ca. 93% nitrate removal at Cu-Pd catalyst was achieved within ca. 60 min. The comparatively lower CuO content of ca. 9%, as confirmed by XANES, resulted in a greater number of free NRR active sites inducing the superior catalytic activity of the Cu-Pd catalyst. On the other hand, NRR product selectivity investigations showed that Cu- Pd catalyst was highly ammonia.selective with a maximum of ca. 24% selectivity at a flow rate of 0.1 mL min-1, while Cu-Pt catalyst was much selective to intermediate nitrite ions reaching a maximum of ca. 35% selectivity at the same flow rate.
Keywords:Noble metal films;Reactivity;Selectivity;Nitrate reduction;Electrocatalysis
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