Catalytic behavior and synergistic effect of nonthermal plasma and CuO/AC catalyst for benzene destruction|
He, C.; Cao, L.; Liu, X.; Fu, W. & Zhao, J.
Nonthermal plasma-catalysis hybrid technology
(NTP-C) operated at ambient temperature and
pressure offers an innovative and effective approach to
solving the problem of dilute volatile organic compounds
pollution. Herein, the destruction of benzene (50–450 ppm)
over an in-plasma NTP-C composite system was investigated.
The AOx/active carbon (AOx/AC), AOx/3A molecular
sieve (AOx/MS), and AOx/γ-Al2O3 (A = Fe, Ag, Zn,
Mn, and Cu) catalysts were prepared by the incipientwetness
impregnation method. The destruction performances
of NTP alone and NTP-C are compared under
different reaction conditions, such as inlet reactant concentration,
catalyst type, and energy density. AC exhibits
the best benzene removal efficiency among three catalyst
supports, and the performances of AOx/AC under different
conditions follow the trend of CuO/AC>MnO/
AC. The NTP with CuO/AC system exhibits the highest
benzene elimination capability with almost 90.6 % inlet
benzene removed at energy density of 70 and 270 J L-1.
The strong adsorption ability of AC and the optimal catalytic
ability of crystalline structure of CuO on the AC
support may be contributed to the excellent performance of
CuO/AC. It is found that the NOx by-product also can be
well controlled over NTP-CuO/AC system. Additionally,
the surface of CuO/AC is more slipperier and
homogeneous with the reaction proceeding, indicating
higher stability of CuO/AC.
Nonthermal plasma; Benzene; CuO/AC; Reaction conditions; Synergistic effect