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Promotional effect of Ce in NH3-SCO and NH3-SCR reactions over Cu-Ce/ SCR catalysts
Wenjie Liu,Yifei Long,Shinian Liu,Yongyan Zhou,XinTong,Yajie Yin,Xiaoyi Li,Kang Hu,Jiangjun Hu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-
Commercial V-W-Ti catalysts were modified with Cu and different contents of Ce to remove slip ammoniaand remaining nitrogen oxide from the end stage of SCR technology. The activities of NH3 oxidation byO2 (NH3-SCO) and NO reduction by NH3 (NH3-SCR) of these catalysts were examined from 150 to 400 ℃. The consequences indicated that the addition of Ce and Cu could considerably enhance NH3 oxidation andNO reduction capacity of the catalysts and Ce was conducive to reduce the detrimental effects of H2O andSO2. The characterization tests indicated that the surface active oxygen increased because of the interactionbetween V, Cu and Ce. Moreover, the loaded Ce and Cu contributed to enhance the surface acidityand redox property of SCR catalysts.
Kui Wu,Yangyun Zheng,Qingping Wu,Haiying Chen,Songzhe Fu,Biao Kan,Yongyan Long,Xiansheng Ni,Junling Tu 한국미생물학회 2019 The journal of microbiology Vol.57 No.12
In order to adapt to different environments, Vibrio parahaemolyticus employed a complicated quorum sensing system to orchestrate gene expression and diverse colony morphology patterns. In this study, the function of the putative quorum sensing signal synthase gene cqsA (VPA0711 in V. parahaemolyticus strain RIMD2210633 genome) was investigated. The cloning and expression of V. parahaemolyticus cqsA in Escherichia coli system induced the production of a new quorum sensing signal that was found in its culture supernatant. The signal was purified by high performance liquid chromatography methods and determined to be 3-hydroxyundecan- 4-one by indirect and direct mass spectra assays. The deletion of cqsA in RIMD2210633 changed V. parahaemolyticus colony morphology from the classical ‘fried-egg’ shape (thick and opaque in the center, while thin and translucent in the edge) of the wild-type colony to a ‘pancake’ shape (no significant difference between the centre and the edge) of the cqsAdeleted colony. This morphological change could be restored by complementary experiment with cqsA gene or the signal extract. In addition, the expression of opaR, a well-known quorum sensing regulatory gene, could be up-regulated by cqsA deletion. Our results suggested that V. parahaemolyticus used cqsA to produce 3-hydroxyundecan-4-one signal and thereby regulated colony morphology and other quorum sensing-associated behaviors.