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Plasma driven catalysis technology was applied for NO removal from flue gas over HZSM-5 zeolite. The A-N2-D-N2 (Adsorption-N2 flushing-non-thermal plasma(NTP) decomposition-N2 flushing) system was found to be effective for both NO removal and energy consumption. HZSM-5 exhibited excellent performance in adsorbing NO from the low-concentration gas emissions and the adsorption capacity could be well recovered in the subsequent non-thermal plasma treatment process. In the adsorption-plasma process, the N2 purging after NO adsorption stage significantly improved the decomposition efficiency of adsorbed NOx. The A-N2-D-N2 system exhibited excellent recyclability and sustainable capability with about 90% NO removal efficiency after six cycles.

Dielectric barrier discharge (DBD) reactor packed with a MnO x catalyst was used to investigate nitric oxide (NO) conversion. Characterization of MnO x with and without O 2 plasma treatment was carried out by powder XRD, XAFS, XPS and BET methods. The results show that plasma treatment increases the adsorbed oxygen on the surface of MnOx catalyst, and also changes the oxidation state of partial concentration of Mn cation from Mn(III) to Mn(IV). Reactive surface oxygen species can be generated from lattice oxygen and/or direct interaction with plasma generated species. The adsorbed oxygen species formed on the catalyst surface of MnO x can enhance the oxidation performance of the plasma-catalytic process.

Nonthermal plasma (NTP) treatment was investigated to modify the Mn–CoO x catalyst for the low-temperature oxidation of nitric oxide. The catalysts were characterized by XRD, BET, TGA and XPS techniques. The results showed that the activity of NTP-treated catalysts improved significantly, and that NTP treatment has the advantage of changing the structural and morphological properties (higher surface areas and pore volume) and varying the relative surface concentration and oxidation states of surface species over catalysts. High surface areas and pore volume, high concentration of chemisorbed oxygen, Mn 4 + and Co 2 + , and the efficient synergetic catalytic effect between Co and Mn ions were thought to be the main reasons for the high activity of NTP-treated catalysts.

This paper describes the low-temperature removal of carbon disulfide (CS 2 ) from gas streams via the catalyst (KOH impregnated Fe–Cu–Ni/AC) prepared by the sol–gel method. Deactivation and reactivation of catalyst were studied as well as the desulfurization production analysis. The catalysts were characterized by SEM–EDS, FT-IR, and N 2 adsorption/desorption techniques. Elemental sulfur, metal sulfide, and sulfate are ultimately generated on the surface of the catalyst. The consumption of basic sites and the blocking of pores are considered to be the main reasons for the catalyst deactivation. The catalytic activity can be recovered after immersing KOH solution under ultrasonication.