Catalytic removal of NO2 by Nickel _ platinum catalyst supported on multi-wall carbon nanotubes

Abstract

<p>In the present study, the NO2 removal efficiency at concentrations of 3000 to 5000ppm was evaluated by nickel and platinum bimetallic catalyst supported on multiwalled carbon nanotubes (Ni-Pt/MWCNT) along with water vapor at different space velocity and temperatures. Morphological and structural characteristics, material formation phases and catalyst regeneration were investigated by FE-SEM, XRD and TPR tests, respectively. The results showed that increasing the weight percentage of platinum at Ni-Pt/MWCNT catalyst improved the removal efficiency at low temperature. The catalyst 25%W.Ni-3%W.Pt/MWCNT provided 92% removal efficiency at the temperature of 300℃, space velocity of 25000/hr and concentration of 3000 ppm, while,the 15%W.Ni-5%W.Pt/MWCNT represented highest removal efficiency (70%) at the temperature of 150℃. The removal efficiency of Ni-Pt/MWCNT catalyst is affected by the weight percentage of nickel and platinum, as well as the NO2 concentration at various temperatures. The results suggest that H_2 O can be used as a reducing agent to reduce 〖NO〗_2 by produced〖 H〗^+. The 25%W.Ni-3%W.Pt/MWCNT catalyst removal efficiency at the vicinity of water vapor and concentration of 3000 ppm 〖NO〗_2 , unchanged stability over the period of 100 minute.</p>