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Ding J.,Nanjing University of Science and Technology | Zhong Q.,Nanjing University of Science and Technology | Zhang S.,Nanjing AIREP Environmental Protection Technology Co.
Fuel Processing Technology | Year: 2014

A novel oxidation-removal process for simultaneous removal of NO X and SO2 was developed, which utilized the catalytic ozonation over Ce-Ti catalyst and assisted with a glass made ammonia-based washing tower. Compared with conventional flue gas treatment, the present method acquires non-secondary pollution, minimal waste production and low operating costs. The main byproducts, ammonia sulfate and nitrate, are important fertilizers and industrially raw materials. A maximum removal of 95% for NO X and nearly complete SO2 removal were obtained with the assistance of washing tower under the following experimental conditions: O 3 concentration, 8.5 mg·L- 1; flow of oxidant mixtures, 100 mL·min- 1; simulated flue gas temperature, 120 °C; H2O flow, 2.4 mL·min- 1; and total gas flow, 400 mL·min- 1. The reaction mechanisms are discussed, and the final oxidation products are characterized. The experimental results show that the OH radicals from catalytic ozonation have an oxidation-removal effect of NOX and SO2. The multipollutant capacity of the washing tower is largely enhanced with the Ce-Ti catalyst. And the present method performs better stability with the assistance of the washing tower. © 2014 Published by Elsevier B.V. Source


Ou M.,Nanjing University of Science and Technology | Ou M.,Nanjing AIREP Environmental Protection Technology Co. | Zhong Q.,Nanjing University of Science and Technology | Zhong Q.,Nanjing AIREP Environmental Protection Technology Co. | And 2 more authors.
Journal of Sol-Gel Science and Technology | Year: 2014

Novel visible-light-driven g-C3N4/BiVO4 composite photocatalysts were fabricated via sol–gel and simple mixing and heating methods. The photocatalysts were characterized by X-ray diffraction, thermogravimetric, Fourier transform infrared, transmission electron microscope, Brunauer-Emmett-Teller, X-ray photoelectron spectroscopy, diffuse reflectance spectroscopy, and photoluminescence spectra. The results indicated that BiVO4 was well dispersed on g-C3N4 sheet and an interaction between g-C3N4 and BiVO4 was confirmed, which were facile to the electron transfer from g-C3N4 to BiVO4 species. The mechanism was further induced to the heterojunction effect to improve the photocatalytic efficiency. The g-C3N4/BiVO4 heterojunction at a weight ratio of 80 % calcined at 500 °C exhibited the most excellent photocatalytic ability for RhB decolorization under visible-light irradiation (λ > 420 nm) which was extraordinary more active than that of pure components. © 2014, Springer Science+Business Media New York. Source


Ding J.,Nanjing University of Science and Technology | Ding J.,Nanjing AIREP Environmental Protection Technology Co. | Zhong Q.,Nanjing University of Science and Technology | Zhong Q.,Nanjing AIREP Environmental Protection Technology Co. | And 2 more authors.
Industrial and Engineering Chemistry Research | Year: 2015

Amorphous cerium and titanium mixed oxides (Am-CeTi) and crystalline cerium and titanium mixed oxides (Ct-CeTi), prepared by coprecipitation and impregnation methods, respectively, were successfully utilized in catalytic ozonation for NOx removal. The catalytic activity has been confirmed to be determined by the concentration of ·OH radicals. Am-CeTi shows higher activity than Ct-CeTi. Ce-O-Ti linkage bonds, with an interaction between Ce and Ti on an atomic scale, are confirmed for the first time to be an active site for catalytic ozonation to remove NOx. The incorporation of more Ce results in an amorphous structure (Am-CeTi) and a higher number of Ce-O-Ti linkage bonds as compared to that of Ct-CeTi, and the Ce-O-Ti structure is directly observed by HR-TEM. Moreover, such incorporation is responsible for less surface defects and lower densities of surface hydroxyl groups because of the elimination of crystalline defects. The higher catalytic activity of Am-CeTi indicates the small effect of surface defects and surface groups. © 2015 American Chemical Society. Source


Zhong L.,Nanjing University of Science and Technology | Zhong L.,Nanjing AIREP Environmental Protection Technology Co. | Cai W.,Nanjing University of Science and Technology | Cai W.,Nanjing AIREP Environmental Protection Technology Co. | And 2 more authors.
RSC Advances | Year: 2014

A series of cerium modified Cr/Ti-PILC catalysts were evaluated, which showed a remarkable increase in the activity of NO oxidation. The aim of this novel design was to investigate the mechanism of cerium modification over the Cr/Ti-PILC catalyst. Physicochemical characteristics were investigated in detail by various techniques such as BET, TPD (NO and O2), XPS, PL, EPR and DRIFTS. The analysis results demonstrated that cerium modification could facilitate the generation of oxygen vacancy via charge transfer, promote the formation of surface superoxide ions (O2 -), and increase the amount of surface nitrates. Furthermore, the original oxidation pathway of Cr/Ti-PILC was maintained by cerium modification. The experimental results showed that the NO conversion of CrCe(0.25)/Ti-PILC catalyst was increased to nearly 66.9% at 300 °C. This journal is © the Partner Organisations 2014. Source


Zhang S.,Nanjing University of Science and Technology | Zhang S.,Nanjing AIREP Environmental Protection Technology Co. | Zhong Q.,Nanjing University of Science and Technology | Zhong Q.,Nanjing AIREP Environmental Protection Technology Co. | And 2 more authors.
Applied Surface Science | Year: 2014

A series of V2O5/TiO2 catalysts with different ratios of TiO2 rutile phase was prepared. Focusing on the effect of TiO2 rutile phase on V2O5/TiO 2 catalyst for the selective catalytic reduction (SCR) of NO with NH3, the NO conversion for the different catalysts was investigated. The experimental results showed that a small amount of TiO2 rutile phase could improve the NO conversion significantly below 270 °C. Analysis by XRD, NH3-TPD, UV-vis, EPR and DFT calculation showed that the rutile phase of TiO2 supporter decreased the band gap, especially, the conduction band level. It improved the formation of reduced V species and superoxide ions that were important to the low-temperature SCR reaction. © 2014 Elsevier B.V. Source

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