Tianjin Key Laboratory of Applied Catalysis Science and Technology

Tianjin, China

Tianjin Key Laboratory of Applied Catalysis Science and Technology

Tianjin, China

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Li X.,Tianjin University | Li X.,Tianjin Key Laboratory of Applied Catalysis Science and Technology | Chen C.,Tianjin University | Chen C.,Tianjin Key Laboratory of Applied Catalysis Science and Technology | And 10 more authors.
ACS Catalysis | Year: 2013

Herein, we report the Pd-doped perovskite La0.7Sr 0.3CoO3 as an effective lean NOx trap (LNT) catalyst. This smart perovskite displays excellent NOx reduction activities for lean-burn exhausts (NOx conversion >90%, N 2 selectivity >90%) over a wide operating temperature range (275-400 C), as well as an extremely high sulfur tolerance. Our results evidenced Pd dissolving into or segregating out of perovskite in lean-burn and fuel-rich atmospheres. The segregated metallic Pd from perovskite in fuel-rich atmospheres is crucial for obtaining these promising achievements. These findings provide a new possibility for the application of the Pd-based LNT catalysts. © 2013 American Chemical Society.


Guo L.,Tianjin University | Guo L.,Tianjin Key Laboratory of Applied Catalysis Science and Technology | Xian H.,Tianjin University | Xian H.,Pei Yang Distillation Engineering Ltd Company | And 7 more authors.
Journal of Hazardous Materials | Year: 2013

NOx emission control of lean-burn engines is one of the great challenges in the world. Herein, the MnOx model catalysts with the different calcination temperatures were synthesized to investigate their NO adsorbability for lean-burn exhausts. The transformation from (β-)MnO2 to (α-)Mn2O3 following the increased calcination temperatures was evidenced from the viewpoint of the local atomic level. Among these samples, the one calcined at 550°C containing the single α-Mn2O3 phase displayed the best NO adsorbability: NO was mainly adsorbed in the forms of NO/nitrites and NO2/nitrates at the low and high temperatures, respectively; the NO oxidation ability displayed the volcano-shape following the increased operating temperatures, and reached the maximum, i.e. 92.4% of the NO-to-NO2 conversion, at 250°C. Moreover, this sample presented the efficiently reversible NO adsorption/desorption performance in alternative lean-burn/fuel-rich atmospheres, due to the weakly bonded NOx on it. The superficial oxygen species plays a critical role for the NO oxidation over α-Mn2O3. The consumed superficial oxygen could be further compensated by the gaseous and lattice oxygen therein. Our findings show that the α-Mn2O3 material is a promising NOx adsorber for lean-burn exhausts even at low operating temperatures. © 2013 Elsevier B.V.


Ding Q.,Tianjin University | Ding Q.,Tianjin Key Laboratory of Applied Catalysis Science and Technology | Xian H.,Tianjin University | Xian H.,Pei Yang Distillation Engineering Ltd Company | And 4 more authors.
Catalysis Science and Technology | Year: 2013

Herein, we successfully synthesized well crystallized La 0.7Sr0.3CoO3 perovskite nanoparticles confined in the mesopores of a SiO2 support. This perovskite exhibited extremely high NOx adsorbability for lean-burn exhausts, as well as improved stability in reducing atmospheres. © 2013 The Royal Society of Chemistry.


Chen J.,Tianjin Key Laboratory of Applied Catalysis Science and Technology | Chen Y.,Tianjin Key Laboratory of Applied Catalysis Science and Technology | Yang Q.,Tianjin Key Laboratory of Applied Catalysis Science and Technology | Li K.,Tianjin Key Laboratory of Applied Catalysis Science and Technology | Yao C.,Tianjin Key Laboratory of Applied Catalysis Science and Technology
Catalysis Communications | Year: 2010

Ni2P/SiO2 catalyst with high dispersion was obtained by temperature-programmedly reducing the precursor that was prepared via a new approach. In this approach, nickel-containing silica was firstly synthesized via a sol-gel process, and phosphorus species were then supported on it through impregnation. In the precursor, the nickel species highly dispersed and the interaction between nickel and support was strong. This contributed to the resistance of Ni2P to sintering, and the resulting Ni2P particles were very small and uniform. The Ni2P/SiO2 catalyst proved to be very active and stable in the hydrodechlorination of chlorobenzene. © 2009 Elsevier B.V. All rights reserved.


Chen J.,Tianjin Key Laboratory of Applied Catalysis Science and Technology | Yao C.,Tianjin Key Laboratory of Applied Catalysis Science and Technology | Zhao Y.,Tianjin University of Commerce | Jia P.,Tianjin University of Commerce
International Journal of Hydrogen Energy | Year: 2010

Ce0.75Zr0.25O2 solid solution supported Ru catalysts were prepared and tested for CH4-CO2 reforming. The effect of Ru content on the properties of the catalysts was investigated by means of N2 adsorption-desorption, H2-TPR/MS, XRD, XPS, CO chemisorption and H2-TPD/MS. It was found that the highly dispersed Ru species favored the interaction between Ru and Ce0.75Zr0.25O2. The reduced Ce0.75Zr0.25O2 was able to store hydrogen, while Ru promoted the reduction of Ce0.75Zr0.25O2. Under the identical conditions, the CH4 and CO2 conversions of the catalysts increased with the increase of Ru content, however, the turnover frequencies of CH4 and CO2 were higher for the catalysts with lower Ru contents, which may be resulted from the strong interaction between Ru and Ce0.75Zr0.25O2. The Ru catalyst exhibited good stability and excellent resistance to carbon deposition. Remarkably, zirconium and cerium hydrides were detected in the used catalyst, which may participate in the elimination of the carbon deposit. Apart from the nature of metallic Ru and the redox property of Ce0.75Zr0.25O2, we suggest that the excellent resistance of the catalyst to carbon deposition is also attributed to the hydrogen storage of the reduced Ce0.75Zr0.25O2. © 2009 Professor T. Nejat Veziroglu.


Souentie S.,Ecole Polytechnique Federale de Lausanne | Xia C.,Ecole Polytechnique Federale de Lausanne | Xia C.,Tianjin Key Laboratory of Applied Catalysis Science and Technology | Falgairette C.,Ecole Polytechnique Federale de Lausanne | And 2 more authors.
Electrochemistry Communications | Year: 2010

The phenomenon of electrochemical promotion of catalysis (EPOC) is most often fully reversible. Subsequent to long-lasting polarization, however, the new steady-state open-circuit catalytic activity after current interruption may remain significantly higher than that before polarization. This phenomenon has been reported as "permanent electrochemical promotion of catalysis" (P-EPOC). The catalytic oxidation of C2H4 was studied over a Pt/YSZ/Au electrochemical cell under excess O2 at 375 °C, combining cyclic voltammetry and mass spectrometry. It has been found that after positive current interruption, the catalytic rate remains in a highly active P-EPOC steady-state, where it is almost double than the initial open-circuit rate. During this highly active steady-state, the application of a similar negative current for a similar time period has been found to result in the return of the catalytic rate to the initial open-circuit state. Similar reversibility of the rate has been observed after cyclic voltammetry experiments where after a complete potential oscillation the open-circuit rate is almost the same to that before polarization. These establish the reported mechanism for the origin of P-EPOC, on promoting species storage and concomitant migration to the metal/gas interface after positive current interruption, through the three phase boundaries. © 2009 Elsevier B.V. All rights reserved.

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