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Preparing Mn-CoO-supported pyrolysis coke catalyst with plasma and its application in the SCO denitration process

100%

Lei Z., Jihao C., Zhang L., Xiangling S., Yonghui L., Min F.

Polish Journal of Environmental Studies

2019

tom 28

nr 5

In order to reduce nitrogen oxides in the flue gas and improve the quality of the atmosphere, an Mn-CoO-supported pyrolysis coke catalyst was prepared using equivalent-volume impregnation, and then its denitration efficiency was studied in a simulated flue gas denitrification device in the paper. The composition of the flue gas was a mixture of N₂, O₂, NO, and SO₂. Good denitration catalysts were prepared by changing plasma modification time and modified power, MnO load and Mn-CoO load. The denitration mechanism of the catalyst was analyzed by XRD, BET and SEM. The results are: optimal modified power in the plasma system was 60W, and the best modified time in plasma system was 3min; after being modified by plasma, the denitration efficiency of catalysts were significantly higher than conventional calcination catalyst; among catalysts with different CoO loadings (5%, 8%, 10%), 8% CoO loading had the best denitration efficiency, the best denitration efficiency reached 98% and time of higher denitration efficiency had also been extended a lot; Mn-CoO-supported catalysts had a certain SO₂-resistance, and the denitration efficiency of Mn-CoO-supported catalyst > MnO/supported catalyst > un-supported catalyst.

Impacts of animal herbivory and water depth on seed germination and seedling survival of Vallisneria natans (Lour.) Hara and Hydrilla verticillata (L. f.) Royle

84%

Min F., Zuo J., Lin Q., Zhang Y., Liu B., Sun J., He F., Wu Z.

Polish Journal of Environmental Studies

2019

tom 28

nr 1

Seed germination is an important reproductive pattern for submerged macrophytes. In order to investigate the effects of animal herbivory and water depth on seed germination and seedling survival of Vallisneria natans and Hydrilla verticillata, we conducted an in-situ field experiment at 3 water depths (0.5, 1, and 2 m) with net and non-net (control) groups in Hangzhou West Lake, China. The results showed that the highest germination rates appeared at 1 m water depth and the lowest germination rates appeared at 2 m water depth (p<0.05) for both species. The mean time to germination (MTG) values that indicate the velocity of germination are greater at 2 m water depth than that at 0.5 m and 1 m water depths for both V. natans and H. verticillata. Net protection obviously promoted germination rates of both species at 0.5 m and 1 m depths, especially for H. verticillata at 1 m (p<0.05). Germination rates of H. verticillata were higher than that of V. natans under any treatment (p<0.05). In the control, seedlings of both species were greatly grazed by herbivorous animals and the remaining seedling number showed no significant difference at different depths (p>0.05). Remaining seedling number in net group was significantly higher than that in control group (p<0.05). Grazing rate of H. verticillata was significantly higher than that of V. natans in control group at all 3 depths (p<0.05). Conclusively, both water depth and animal herbivory significantly influenced germination of V. natans and H. verticillata, and net protection proved to be an efficient method that could promote seedling survival for both species in the field.

Ograniczanie wyników

2 Polish Journal of Environmental Studies

2 Min F.

1 He F.

1 Jihao C.

1 Lei Z.

1 Lin Q.

1 Liu B.

1 Sun J.

1 Wu Z.

1 Xiangling S.

1 Yonghui L.

1 Zhang L.

1 Zhang Y.

1 Zuo J.

2 2019

Wyniki wyszukiwania

Preparing Mn-CoO-supported pyrolysis coke catalyst with plasma and its application in the SCO denitration process

Impacts of animal herbivory and water depth on seed germination and seedling survival of Vallisneria natans (Lour.) Hara and Hydrilla verticillata (L. f.) Royle