Mechanism of Catalytic Oxidation of NO over Mn–Co–Ce–Ox Catalysts with the Aid of Nonthermal Plasma at Low Temperature

Abstract

NO catalytic oxidation performances have been investigated on a Mn–Co–Ce–Ox catalyst by using nonthermal plasma (NTP) reactor: the “PRFC” reactor. In the PRFC system, the plasma reactor was followed by the catalyst. The results showed that the NO catalytic oxidation of the Mn–Co–Ce–Ox catalyst was significantly enhanced by the nonthermal plasma in the PRFC system at the temperature range of 50–250 °C. The oxidation capability of the catalyst was improved with the increase of the input energy density in the PRFC system. It was also found that the activity was suppressed when SO2 was present in the reaction mixture, whereas the catalytic oxidation ability was obviously enhanced under the NTP-assist, because NTP system is conducive to synchronous SO2 removal. The antipoisoning performance and NO catalytic oxidation capacity of this mechanism are superior to those of others reported in the literature.

Low temperature catalytic oxidation of nitric oxide over the Mn–CoOx catalyst modified by nonthermal plasma

“…The manganese acetate, potassium permanganate and cobalt nitrate with a mole ratio of 9:13.5:1 [12,14] was mixed and ground fully for 30 min, then placed in the baking oven at 70°C for 48 h. The product was washed 3-4 times with deionized water and 2-3 times with absolute ethanol, then filtered and dried at 100°C. Finally, the catalyst sample was crushed and sieved to a 40-60 mesh for testing.…”

“…The Mn-CoO x samples were treated by a Catalysis Communications 64 (2015) [12][13][14][15][16][17] dielectric barrier discharge (DBD) reactor in the conditions of output voltages at 5.6, 7.0, 8.5 kV and treatment times for 0.5, 1, 2 h with nitrogen (100 ml/min) atmosphere, respectively. The catalyst treatment includes the plasma output voltage, treatment time, and treatment atmosphere.…”

“…Among them, transition metals such as manganese and cobalt based catalysts showed their potential for NO catalytic oxidation [11][12][13][14]. Our previous work has proved that the addition of cobalt in MNO x catalysts could not only increase the catalytic oxidation efficiency of NO to NO 2 , but also broaden the catalytic activity window [14].…”

Quantum chemistry study on the oxidation of NO catalyzed by ZSM5 supported Mn/Co–Al/Ce

“…[8][9][10] Therefore, many researchers have paid more and more attention to the e®ective and low cost transition metal oxides catalysts. [11][12][13][14][15][16][17][18] The catalysts supported with transition metal oxides are easy to obtain and have a good catalytic activity. Especially, the catalysts supported with Mn, Co and Ce oxides have a good application prospect.…”

“…Especially, the catalysts supported with Mn, Co and Ce oxides have a good application prospect. [13][14][15][16][17][18] But to our knowledge, detailed investigations on the mechanism of NO oxidation catalyzed by the transition metal oxide are quite few. Therefore, the mechanism of NO oxidation catalyzed by ZSM-5 supported Mn/Co-Al/Ce is investigated in detail by employing quantum chemistry in this paper.…”